"just the facts, ma'am". You did the grunt work we never got round to. Very straight delivery. No puff. No spin. Nothing but the meat. Superb. Thank you.
@AndreasSpiess8 жыл бұрын
Thanks!
@saschafriedrich70415 жыл бұрын
prefer 14 or 131 #RufDochDeineMaMa!!!
@ThisMicrophoneSoundsCheap7 жыл бұрын
A Victorinox/Swiss army knife is the perfect pointing device for a guy with Your accent :)
@AndreasSpiess7 жыл бұрын
:-)
@Texas1FlyBoy8 жыл бұрын
Excellent presentation and detail. Thank you for the video. And thank for simply presenting the material (very interesting) without annoying music like so many other youtube videos. Yours are the best! :)
@AndreasSpiess8 жыл бұрын
Thanks! I also do not like music videos! But of course, they are easier to produce ;-)
@johnwest79932 жыл бұрын
My mind is the sort that understands things well, but my rote memory is terrible. So after watching all of your videos initially to get the idea of what is going on I find that with each new project I work on I simply re-view the appropriate video as if it were a topic in an engineering reference book. There are so many wandering, rambling, directionless KZbin videos, but I find your videos are detailed and specific to a topic of interest, and always lead to an optimal solution to specific engineering problems, or at least a functional one. So I feel like I have a video library of nearly all pertinent topics to support my projects, with explanations and optimizations, and it is unnecessary for me to 'reinvent the wheel' for every new project. This channel and your ham channel are like a detailed video version of the Handbook for Radio Amateurs and QEX magazine combined, and they provide the technical support I need to ensure that I can tackle difficult projects and they will work when I'm done. Also, many projects online tell me to buy this and that prefabricated device and just plug it in to make a project work. But their 'this and that' are hundred dollar items! Your projects show inexpensive devices and ingenious ways to solve engineering problems. This is what good engineering is all about. Some other KZbin channels and Internet websites seem to miss that point entirely, or they are simply incapable of doing good engineering. As I am retired and have only a modest income, knowing that your channels are here to Elmer my work enables me to spend my money wisely on my projects, and your reference library of free videos continues to grow. I can't thank you enough. - John
@AndreasSpiess2 жыл бұрын
Thank you very much for your kind words. Indeed, I sometimes go back to one of my videos for reference ;-) Concerning cost: I have many viewers from less developed countries. This is the reason I stick with the cheaper stuff. HAMs seem to spend more money on their hobby. So this channel will feature also more expensive things. Enjoy you hobby!
@AtlantaTerry6 жыл бұрын
Mr. Spiess, I am watching this video now. Thank you. Terry Thomas PC Tech Support Atlanta, Georgia USA
@AndreasSpiess6 жыл бұрын
You are welcome!
@vincentvanderkruit31956 жыл бұрын
Andreas, love your work and effort! I’m starting out, and you help.
@AndreasSpiess6 жыл бұрын
Thank you!
@RomarScott2 ай бұрын
@@AndreasSpiessyears later im on the same path. Thanks man quality content
@SianaGearz8 жыл бұрын
NiMH maintains voltage VERY close to 1.2V across the bulk of its discharge cycle! It starts off at about 1.45V but quickly drops down to 1.25V. This means that in contrast to other types of cells which have a more slanted voltage curve, you can pre-discharge them a little bit and you will only lose little capacity. To accomplish that in-device, you should be able to use a Zener across the NiMH battery pack to clamp the voltage. After the battery is discharged below Zener voltage, mostly through the Zener itself, no current will flow through the Zener and it will no longer contribute to power consumption. Perhaps a similar trick can be accomplished with Li-Ion, but of course you'd need to limit the current, and i'd be wary all around, many angry pixies in there. Perhaps the proper solution with Li-Ion is not an LDO but an active boost/buck regulator - you can discharge much deeper down to typically 1.8V, and you'd have less efficiency loss.
@AndreasSpiess8 жыл бұрын
The buck or boost converters usually take 20-40% of the energy (depending on the voltage difference and make). And they need quite a lot of current if the ESP is in deep sleep. Your idea with a Zener should work. However, this costs some energy. Maybe it would be better to stop charging the battery at this particular voltage instead of charging it full, and then discharging it afterwards. But I am not a battery specialist.
@SianaGearz8 жыл бұрын
Andreas Spiess I don't see why there should be more than a 30% loss at the IC, and can probably be optimised down to 10-ish. Perhaps a major contributor is the output choke or transformer, but those can be done with low resistance too.
@tcurdt7 жыл бұрын
The idea with the Zener is interesting. That would worth a test - and a video ;)
@JithinJose28 жыл бұрын
Very useful one, Expecting more videos on LiFePo4, charging profile details etc...
@AndreasSpiess8 жыл бұрын
Charging profile is simple (as described in the video). As I said, the technology is new for me. So, for the moment, I do not know much more than presented in the video...
@christopher81994 жыл бұрын
Hey Andreas, another great video as always. I am beginning to take notes of your videos because they are so informative
@AndreasSpiess4 жыл бұрын
Thank you for your nice words!
@UpcycleElectronics8 жыл бұрын
Thanks for the intro to LiFePo4. I haven't played with those yet. Why not reverse or modify your battery terminals to run a pair of LiFePo4 AA's in parallel instead of the traditional AA-Series connection? Wouldn't this be a 'best of both worlds' situation? Don't most LiPo cells have an internal over charge/discharge circuit? All of the battery packs I have torn into have them (I haven't taken apart any if the round cells).
@AndreasSpiess8 жыл бұрын
I looked at your proposal concerning turning one cell. Not easy (the minus has a spring, the plus not). So, It would be easier to buy two single holders if you want two in parallel. Concerning LiPo: No, not all have protection circuits. You can buy them with or without.
@manliomalavolti96408 жыл бұрын
Dear Swiss-German guy, very interesting, thx a lot! Bravo! Sehr gut!
@AndreasSpiess8 жыл бұрын
Danke!
@cloudyspecs7 жыл бұрын
Hi Andreas just a quick question. I am planning on using the ESP8266 with one 1.5V AA battery and a boost converter (tps61006). The module will be in sleep mode quite often in our project and only woken up for short period. Do you think this is a good solution? Love your videos. I have learnt a lot and found it very useful for our project. Thank you very much.
@cloudyspecs7 жыл бұрын
Thank you very much for your prompt reply and for the advice. I am using a 1000uF SMD Aluminium Electrolytic Capacitor across VCC of the ESP. I took this from one of your videos. I'll do battery test once I get my PCB done.
@GnuReligion6 жыл бұрын
Am interested in how this goes for you +Venko. Have seen those inexpensive adjustable boost converters on AliExpress, and am curious. I would worry that if the ESP decides to transmit heavy, drawing 800ma, that you would need 3x as much current on the low end ... and the high end may get choppy.
@guatagel24545 жыл бұрын
TCP61006 has a 50uA quiescent current. MCP1624 has a 20uA quiescent current.
@4833504F8 жыл бұрын
LiFePo4 (lithium iron phosphate) batteries are sold for RC applications as transmitter and receiver batteries. They have a lower self-discharge rate and better temperature characteristics as LiPo, but a far higher internal resistance. Quite good for devices like outdoor temperature sensors, if you really want to bother with rechargeables in such a scenario.
@AndreasSpiess8 жыл бұрын
Thanks for the info. You are right, I also assume in my summary, that you might use the "hassle free" alkaline technology if current consumption is small.
@bruceclothier8238 Жыл бұрын
Informative, well researched, concise and unpretentious. Would that so many other videos were like that. Thanks
@AndreasSpiess Жыл бұрын
Thank you for your kind words!
@davejack30547 жыл бұрын
Hi Andreas, thank you for taking the time to create discharge curves and publish them in your channel. This is very useful. As you know, some of us live in cold places and batteries do not always do well there. Most Li ion cells are optimized for temperatures above 0C and do poorly below that. I am curious to know if your LiFePo cells do well in the cold.
@AndreasSpiess7 жыл бұрын
I never tried and there is not a lot of literature about that fact.
@your-digital-bodyguard7 жыл бұрын
Hi Andreas, Dave, I live in Canada and I have been using both the Titus 3.7 V C Cell and Titus 3.7 V AA Lithium Thionyl Chloride batteries, -55C to +85C. I highly recommend them, I used them in the military for our remote sensors and GPS units, even in the Arctic. We are currently using inside transport GPS trackers for almost a year without replacing.
@AndreasSpiess7 жыл бұрын
+ExNavy But these are non-rechargeable, right?
@your-digital-bodyguard7 жыл бұрын
Yes, that's correct. For rechargeable use, I just received their new High Pulse Super Capacitor HP1520 rated at 4.0Vdc (actually 3.6Vdc)
@stupossibleify5 жыл бұрын
Hi Andreas. Although you link to your blog, I can't find the supporting article to this video. Where exactly do you connect the AA batteries? The 5V pin (via the regulator) or to the 3.3V?
@AndreasSpiess5 жыл бұрын
Maybe you watch the video again. You should find the diagram in the video.
@stupossibleify5 жыл бұрын
@@AndreasSpiess apologies. I'm trying to understand where to connect NiMH batteries to the Wemos D1 which has a LDO regulator on the 5V pin as well as standard USB interface for power.
@colinl42216 жыл бұрын
Thanks Andreas - great analysis and summary as usual. Very helpful.
@AndreasSpiess6 жыл бұрын
:-)
@javierpallalorden8 жыл бұрын
Hi Andreas, nice video! Must get a connection battery, very handy.
@AndreasSpiess8 жыл бұрын
Thanks. I think, this battery can be done yourself. Just use a woodstick, cut it to length, and put a wire from one to the other side (maybe with a screw on both sides).
@thelwq7 жыл бұрын
With LIFEPO4 you will still need some undervoltage protection... And the main advantages of LIFEPO4 are great low temperature performance and possible high charge/discharge rates... But in case of no low temperatures I prefer to use more 18650 and LDO, it does make sense if you are not space constraint...
@fons3 ай бұрын
Nowadays there are also 1.5 volt aa/aaa lithium ion batteries (through an internal regulator). You can feed the esp32 directly with two in series. Also, there are Nickel-Zinc batteries with a typical output of 1.6v. You can also put two in series to feed the esp32, but they supply 1.8 when fully charged so it may be risky.
@AndreasSpiess3 ай бұрын
Thank you for the additional info!
@GRBtutorials6 жыл бұрын
Hello, I know this is an old video, but I wanted to say something: 1. If you use a buck converter, you get higher efficiency and the capacity lost might be only about 5 % in the worst cases. Plus, there's almost no voltage drop so you can use it until it reaches 3 V, but for stability, it's better to cut off at 3.1 V or 3.2 V, when the battery is almost empty, and also Li-ion batteries don't like being fully discharged, so it's better for the battery. 2. There are different Li-ion chemistries. The most common are LCO (Lithium Cobalt Oxide, LiCoO2), which is the most common type and with extremely high capacity, but the most dangerous, NMC (Lithium Nickel Manganese Cobalt Oxide, LiNiMnCoO2), the next more common type, used in Panasonic's NCR18650 batteries, which are safer with almost the same capacity and LFP (Lithium Iron Phosphate, LiFePO4), the safest "cheap" ones (there's also lithium titanate, LTO, tremendously expensive), but with lower capacity.
@AndreasSpiess6 жыл бұрын
Thank you for your information. I am only a "battery user" and do not understand too much. So I learned something...
@GRBtutorials6 жыл бұрын
You're welcome. A page with further information is this one: batteryuniversity.com/learn/article/types_of_lithium_ion. Battery University is a good website to learn about batteries.
@youreale8 жыл бұрын
I use lithium 3.5v battery from discarded cell phones. It works like a charm, even when you're recording a new firmware on the device. I also use a small silicon diode in order to drop the Vcc + a little.
@AndreasSpiess8 жыл бұрын
Diodes are ok to drop voltages. However, I prefer LDO regulators because they have a variable drop (at the beginning more, at the end less than a diode). And they are also not very expensive.
@juergenschubert32475 жыл бұрын
Where do you got the connector cells which are empty cells? Any link?
@DanieleGiorgino5 жыл бұрын
Thank you, just the video I was looking for.
@AndreasSpiess5 жыл бұрын
You are welcome!
@movax20h4 жыл бұрын
This is really cool. I knew about LiFePO4, but never seen them in 18650 package before. Are there some chips similar to TP4056 but for charging small LiFePO4 cells (~500mA)? Right now you need to essentially disconnect the cell and charge it somewhere else. I do have situations where I would prefer to have micro USB socket and power coming, and if it is available charge the cell (but preferably never charge with more than 3.6V), but once the USB power is gone the chip will shutdown, and ESP8266 would work just fine. TP4056 can't be used here due to different charging curves, as well too high charging voltage, which would prevent you from using it directly with ESP8266. This could serve both as a quick recharging (2-3 hours for medium size battery), or just as a backup power. Also it is nice to know about ESP32 voltage range: 2.3V - 3.6V. The internal LDO regulators regulate it down to 1.1V / 0.9V and 1.8V for various purposes. The lower operating 2.3V is guaranteed, and it can probably operate a bit below that fine too. So you can squeeze quite a lot of power out of the battery. Possibly even too much. :D Technical specification says that it can operate down to 1.8V correctly, at least internally, but ADC will behave differently (can be compensated), and one would have trouble communicating with external chips probably. Some active cell voltage monitoring by ADC, to warn about too low voltage, and or switch off to ultra deep sleep when it goes even lower, would be a good option too. I do not know how the ESP32 behaves when the VDD is below 2.3V exactly. Optimally it would switch off completely and use less than 0.1uA in that state to prevent catastrophic (or just permanent damage) discharge of the cell.
@EctoMorpheus4 жыл бұрын
I have exactly this question; I want to power an ESP32 with some LiFePO4 batteries, but cannot find any chargers anywhere that are reasonably priced for just some minor hobby projects. I'd be very happy if I can repurpose one of my old phone chargers, but I'll need a controller of some kind...
@erwinschrodinger92627 жыл бұрын
I'm currently field testing supply by 3 x AA Eneloop accu cells and one BS120 Schottky diode in series. (mostly because i've got lots of both components in my spare parts ;) works like a charm so far.
@clemensruis Жыл бұрын
I had the same idea, but the problem is that the voltage of diodes is dependant on the current.
@AlamoCityCello6 жыл бұрын
Great Video! Love the Swiss Army Knife at the end!! lol
@AndreasSpiess6 жыл бұрын
Thanks! You see the Army knife even more in the mailbag videos
@viisteist13637 жыл бұрын
nice, but isnt the 3xAA percentage also 80-90% then? and Lifepo4 cells are the best with 82% then? and could i also get 5volts from the board itself(5v output pin), if the battery input is only 3.0-3.2 volts? (because some sensors require 5volts input.... even if pwm output is 3.3v....)
@AndreasSpiess7 жыл бұрын
Most boards have a linear regulator which only converts 5 volt to 3.3 volt. Not in the other direction.
@Jaybearno6 жыл бұрын
Thanks for the video Andreas! I couldnt tell from the discharge charts, do you have stats on real-world battery life for the different options?
@AndreasSpiess6 жыл бұрын
No, I did not do these measurements in real life
@johninyork5 жыл бұрын
Hi Andreas, I have only just watched this video as I'm new to physical computing. Does your recommendation to use LiFePo4 batteries still hold true as it's been a couple of years since you made this video. Thanks.
@AndreasSpiess5 жыл бұрын
The basic chemistry did not change and the statements are still valid
@johninyork5 жыл бұрын
@@AndreasSpiess thanks for the speedy reply.
@biker2k35 жыл бұрын
Yo tengo muy buenos resultados con 2 Alcalina AA sin regulador, funciona hasta los 2.17v. Ahora voy a probar con una 18650 en serie con un diodo. Aunque tambien el regulador del wemos d1 es bastante eficiente. I have very good results with 2 AA Alkaline without regulator, it works until 2.17v. Now I'm going to try a 18650 in series with a diode. Although also the regulator of wemos d1 is quite efficient.
@AndreasSpiess5 жыл бұрын
It is good if it works, however, 2.17 volts is out of specifications
@PhattyMo Жыл бұрын
I often run ESP8266's directly from a Li-ion 18650,without any real problems. I use TP4056 modules for charge/discharge control.
@AndreasSpiess Жыл бұрын
If these modules have a voltage regulator that is fine.
@JimBell207 жыл бұрын
Are chargers available for the LiFePo4 cells? Can you charge them with a lipo charger like the battery shield for the WeMos 8266?
@AndreasSpiess7 жыл бұрын
Not many. Because of the lower max. voltage you cannot use a lipo charger (unless you disconnect manually when the voltage is reached. I use a normal bench power supply with max current and max voltage.
@086dx667 жыл бұрын
Andreas thx for compare. its really useful
@AndreasSpiess7 жыл бұрын
You are welcome
@yvonnedicketmuller77604 жыл бұрын
hi, thanks for the video!! it's really informative and i will look into the lifepo4 battery for a new project with my esp32 dev kit. one thing i was wondering though: could i also connect a power bank over the micro USB port? that would mean to supply 5V to the board, but would that not be the same as to connect to the USB port of my computer when uploading a sketch? the 5 V would then be regulated don to 3 V on the board itself, at least in my understanding. thanks
@AndreasSpiess4 жыл бұрын
The normal dev kits have voltage regulators for the 3.3 volts needed by the ESP32 and a charging IC for the battery. But these charging ICs are not compatible with LiFePo4. They have a max voltage of 4.2 volts for Li-Ion.
@StephenVermeulen2 ай бұрын
How about pre-discharging some of the cells that are a bit too high voltage before using them? That way you could skip the regulator.
@AndreasSpiess2 ай бұрын
A possibility. But you would loose a lot of capacity.
@3012paul2 жыл бұрын
Great presentation. I think its better to charge 18650 to only 3.6v max then ldo will not required. If powering from fully charged single 18650 then ldo is only useful will till the voltage drop from 4.2 to 3.6 after that not needed. This needs to be tested if waste or avoiding waste is better.
@AndreasSpiess2 жыл бұрын
Then I would not use a standard Li-Ion battery. I would use a LiFePo4. You lose too much capacity from 4.2 to 3.6 volts.
@w-mwijnja89193 жыл бұрын
What is your opinion about LiSOCl2-batteries by the way? They are also available in AA, ½AA and other common sizes, run at 3.6V, have a high capacity and a very slow discharge profile. They are not rechargeable, but maybe more appropriate than LiFePo4 for situations where recharging is not desired (or not possible)?
@AndreasSpiess3 жыл бұрын
I never used them so far. I do not know if they are able to supply the peak current of an ESP32, but for a LoRa node they would be very good, I think.
@bert-janroelofs78494 жыл бұрын
Thanks for all your great video's! Is it also an idea to use a Lipo and a simple Germanium diode for a little bit voltage drop? Thank you. Best regards Bert-Jan Roelofs
@AndreasSpiess4 жыл бұрын
Diodes have a constant voltage drop, also at the end of the battery life. LDOs have a variable drop.
@refusneant4 жыл бұрын
Thanks ,Clear as usual but why you didn't consider lithium 3.6 non rechargeable battery
@AndreasSpiess4 жыл бұрын
I do not know this technology.
@atatistcheffs6 жыл бұрын
Andreas, thanks for this great comparison. I'm looking at several types of voltage regulators for use with the 3xAA solution. I want one with the input voltage as close as possible to 3.3v to take full advantage of the battery life. Do you have any particular modules or other advice on how to ensure I get the best one?
@AndreasSpiess6 жыл бұрын
HT7333 is a good one
@RandomHacks8 жыл бұрын
3:44 correct me if I'm wrong but I think the icr14500 are AA size
@AndreasSpiess8 жыл бұрын
You are right. I was not aware. Another commenter had the same comment. I will insert a remark.
@dennisjansen52058 жыл бұрын
Hello Andreas. Although I knew about LiFePO batteries I never considered using them with my 8266's but I will now! I was struggling with voltage regulators and buck convertors but maybe I can skip all that and use LiFePO's instead.By the way, in the video you mention that LiPo batteries are not available in AA packages but I believe that 14500 batteries are roughly the same size. Some LED flashlights can use AA batteries or 14500's.
@AndreasSpiess8 жыл бұрын
You are right, they are also available in this package. So, you have the same "danger" as with the LiFePo4 batteries... You shouldn't struggle with linear regulators, they usually work fine, if you add a beefy capacitor between plus and minus of the ESP. Maybe you watch my videos about deep sleep. There, You find some explanations and tips.
@obuw15 жыл бұрын
Hi Andreas, I was just thinking, when using a Lipo cell, would it not be possible to only charge the Lipo up to 3.6V, so that you don't need an LDO when using it in the circuit? Assuming you can control what voltage the charger stops at of course. How would a lipo capacity compare to lifepo4 in this case?
@AndreasSpiess5 жыл бұрын
I do not know. I think the LiPo is charged less than 50% at 6.6 volts.
@obuw15 жыл бұрын
@@AndreasSpiess When I was looking at charts earlier, it looked like a LiPo would be 90% charged at 3.6V, but now that I'm looking at more charts, they seem to be all over the place, most being at 50% - 80% charge at 3.6V, depending on how many amps you're drawing I think... So it definitely doesn't look like a good option if you have LiFePo4 batteries.
@TheManFromMoon2 жыл бұрын
Hello Andreas, thank you very much for this video. Meanwhile almost 6 years have passed after this video. What is your experience with it today? I am looking for a solution to run an ESP8266 with a protected Soshine 5500mAh rechargeable Li-ion battery. What is your recommendation to get maximum uptime with these components? I would also like to monitor the voltage. What is your solution to get this running? Thank you and best regards, Chris
@AndreasSpiess2 жыл бұрын
Currently, LiFePo is my favorite. and usually I create a voltage divider to reduce the battery voltage to an acceptable maximum for the ADC of the MCU. You can use quite high value resistors to save energy. And then I measure the real voltage with a multimeter and make the calculation to get the same value in the sketch.
@easynow65994 жыл бұрын
excellent video...about LiFePO4: they can be discharge down to 2.0V, but at this current wouldnt it damage our ESP8266? there isnt any need for undervoltage protection?
@AndreasSpiess4 жыл бұрын
Usually, the ESP8266 stops to work at about 2.8 volts. But it will still deplete the battery. Therefore it would be good to protect the battery.
@easynow65994 жыл бұрын
@@AndreasSpiess how to protect it? just check the voltage and deep sleep if LiFePO4 battery is < 3V? or there are other protection circuits available?
@wangouthangout4 жыл бұрын
Do you ever use buck converters instead of linear voltage regulators to bring the voltage of your batteries down to ~3.3v? I've got a few buck converters here but never bought voltage regulators because I'd heard they were inefficient.
@AndreasSpiess4 жыл бұрын
Only if the voltage difference is high.
@DonovanMagryta6 жыл бұрын
Hi Andreas, I have a 750mah 3.6v 2.7wh nimh battery and a ttgo v1 esp32 with built in lipo battery connector. I think it has a lipo charging circuit built-in but I'm not sure. My question is, can I use that builtin charger if the ttgo v1 has one to charger the nimh battery safely without damaging the esp32 ttgo?
@AndreasSpiess6 жыл бұрын
I do not completely understand your sentence. The battery connector is here to connect a LiPo battery. So it should be ok to connect one.
@DonovanMagryta6 жыл бұрын
Andreas Spiess Yes I risked it by experimentation and it turns out the built in lipo charging circuit can charge a NIMH battery just fine.
@AttilaBalog8 жыл бұрын
Hello Andreas, very informative video, as always. I'm wondering what you would use if you needed to power your solution using both 3.3V and 5V. Use case is some of the sensors (ultrasonic, PH, etc.) and displays (most of the LCD's) require 5V while ESP8266 requires 3.3V. Bi-directional logic level converters can be used for the data lines but we still need to power the sensors/displays using 5V. Thank you in advance :)
@4833504F8 жыл бұрын
many sensor modules just require 5V because they need a stable (low noise) 3.3V supply and use a linear regulator with 1.25V drop. in a low current battery application, it might be worthwile figuring out if you can supply the sensor directly, especially if you are already using a linear regulator elsewhere for 3.3V.
@AndreasSpiess8 жыл бұрын
If you need 5 volt and 3.3 volt just use a linear 3.3 volt regulator (e.g. AMS1117). You even do not need a LDO because the voltage difference is 1.7 volt. Just make sure, that the package can dissipate the heat.
@xroute19268 жыл бұрын
i'm trying to figure out how to achieve long battery life like your #47 video and also supply 5v and 3.3v. Will you make a video to address it? Thank you.
@DIYwithBatteries4 жыл бұрын
I love the lithium batteries 😍 those are awesome.
@AndreasSpiess4 жыл бұрын
Me too!!
@JimBell207 жыл бұрын
What do you think of using a LoPo cell with a simple diode in series? I have some ancient 1N4001 diodes here and they drop the voltage by .6v. I am guessing that there are better choices for a diode, but I have no experience with them. The 4.2v would be dropped to 3.6 which is within the 8266 specs. The voltage to the 8266 would be too low at the end of the discharge curve, but most of the LiPo capacity should be available.
@AndreasSpiess7 жыл бұрын
You can use a diode as you describe. LDOs usually have only 0.15 volt difference at the end. So, you would gain a little. But the ESP usually works below 3 volt, even if it is out of specs. I usually use a LDO because they are not expensive and I have always exact 3.3 volt (also for other parts).
@amemo063 жыл бұрын
Old, but pretty nice and informative video. Thanks for it. Did by any chance you found rectangular flat LiFePO4 battery somewhere in the internet? Something around 1000mAh and few millimeters thickness? So far, I did not succeed...
@AndreasSpiess3 жыл бұрын
I used a flat one in my mailbox notifier. But it had a higher capacity
@amemo063 жыл бұрын
@@AndreasSpiess thanks a lot, could you share the reference. Maybe from it I may find a flat one. Ideally, I would love to find one of 2-4mm thick
@AndreasSpiess3 жыл бұрын
Unfortunately the supplier does no more sell the one I have
@daskasspatzle23968 жыл бұрын
The connector batteries are interesting. I have a bunch of used but not empty 3,6 V Litium AA batterie (not accumulators however) and use them in clocks/weatherstation. I soldered wires into the battery case which also works. But this connector battries would have been the more nicely and instant reversable solution.
@mattiasfagerlund Жыл бұрын
Wouldn't it be possible to build a bypass circuit that uses the current directly if it's within the spec range and goes through the converter when it isn't? So we'd lose the 20% when outside of spec, but keep 100% when within spec?
@AndreasSpiess Жыл бұрын
Of course, this is possible.
@ShervinEmami6 жыл бұрын
Nicely informative video! The only thing missing is if you made a final comparison to show just how much battery life you would get from each battery option (possibly even with a comparison of their price). From your video it sounds like a LiFePo4 would give the most battery life to an ESP8266 since it has good efficiency and no need for a regulator? But unfortunately you didn't show that in your video. Maybe suitable for a follow-up video, comparing battery life & cost for powering ESP8266 using LiPo vs LiIon vs LiFePo4?
@AndreasSpiess6 жыл бұрын
I do not plan to take cost into consideration as it changes over time. But it should be possible to assess it yourself if you look at the actual price of the batteries you consider to buy. You should have the needed data in the video.
@melbuser227 жыл бұрын
Hi Andreas, Your videos are very helpful and appreciate your effort. Whats the best way to power ESP8266 by a solar panel with a battery charger. Thanks.
@AndreasSpiess7 жыл бұрын
I will do a video about that when we have more sun in my country...
@kke7 жыл бұрын
I think LiFePo4 is the most cold tolerant of rechargeable batteries. If your device needs to work in sub zero temperatures, you may need to create some kind of heating thing to keep LiPos warm, which will likely eat most of their capacity.
@AndreasSpiess7 жыл бұрын
Sub-zero degrees are really a problem for these batteries...
@joshuarosen62426 жыл бұрын
Thank you, that was both useful and interesting.
@AndreasSpiess6 жыл бұрын
You are welcome!
@javiercaceres63672 жыл бұрын
Dear Mr Spiess Voltage question I am new in electronics I want to connect the ESP8266 to one 8x8 Led MAX 7219 The ESP needs to work around 3.3 Volts and the Max works with 4.5 Volts to 5Volts How can I use only one power source to use both without burning the ESP ? Thank you
@AndreasSpiess2 жыл бұрын
Maybe you search for a project proposal which uses these components. That would be the safest. Otherwise: You find 3.3V regulators which work on 5 volts. These can supply your ESP32. Most ESP8255 development boards have such a regulator on board.
@javiercaceres63672 жыл бұрын
@@AndreasSpiess Thank you BTW you have many interesting projects
@easynow65994 жыл бұрын
i bought a 18650 battery shield v8 like the one you have on your aliexpress list..but even if i have it charging for hours, when i open it, it works for some minutes and then both the usb and the 3/5V pins on the sides are power off..(i use it with a esp that deep sleep every 30s) do i have faulty batteries or it is suppose to deactivate when the current is very low?
@AndreasSpiess4 жыл бұрын
I think you have to do your measurements to find the root cause.
@jbammi8 жыл бұрын
Thanks Andreas, very informative video. Just a thought: Instead of using an LDO regulator for for NiMH etc, what if you use diodes in series to drop the small amount of voltage drop required? Would that be more efficient than using an LDO. Of course at the device you would have a higher voltage swing over the useful portion of the discharge curve. Cheers.
@AndreasSpiess8 жыл бұрын
I do not like diodes for that purpose. They have a constant voltage drop of ca. 0.6 volts. With a fully loaded battery this is not enough and if the battery is at the end of its live your device will stop too early. Efficiency can be a little bigger, but if you use a good regulator (see video #58) this is not a problem. The only positive could be, that a diode is cheaper than a regulator, but today, this is only pennies.
@andriitsarenko16963 жыл бұрын
Hey. What do you think about the ch123a 3v battery? Is it worth to use it as a power supply for esp12e?
@AndreasSpiess3 жыл бұрын
You can try. They should be able to deliver the peak currents.
@SimonFiliatrault8 жыл бұрын
I really enjoy all your video... Started on esp8266 a few months back, still learning. I am looking for a circuit for connecting a 5+v PSU through a DC-DC converter at the same time as charging a 3.3v battery and use this battery as backup in case power fails. Any such circuit around? I don`t like to re-invent the wheel! Thanks, Simon from Québec.
@AndreasSpiess8 жыл бұрын
The first question is: Do you only need 3.3V? then, you can avoid 5V and use a 3.3V regulator plus a device to load the battery (depends on the technology). If you need 5V then I would go for a higher voltage battery (6V or above) and use 2 linear regulators, one for 5V and one for 3.3 V. If you take a big 5V regulator you can put the 3.3 v in series. And a device to load the battery. This gives you stable voltages at both rails. Or you go for a 3.3 V battery and a boost converter to boost the voltage to 5V. You need a 3.3 volt battery (which in reality does not exist because no battery is stable). And also here, you need a loader for the battery. Here, only the 5v rail is stable, the 3.3V goes with the battery
@obafemijimoh9184 жыл бұрын
I love your video. I am a little confused though. I am building a control panel and I want utilize the 8266 but I want a steady yet reliable and long lasting power to the module. I am thinking of using a 5V from my SMPS. Can I achieve this?
@AndreasSpiess4 жыл бұрын
It runs as long as it gets 5 volts.
@miikakurkela56068 жыл бұрын
Thank you, Andreas, for a fine video! You said that you had ESP8266 examples which did not run stable at voltages higher than 4 V. Do you have a video (or some other documentation) of these overpowered unstable examples too? In my experiments, if an ESP8266 system with a 3.3 V power supply isn't stable, I usually try it with 4.5 V ... 6.0 V and quite often I get a system that is more stable with that higher voltage. Haven't managed to destroy a single ESP8266 chp yet.
@TheProCactus8 жыл бұрын
Do you have any examples ?
@AndreasSpiess8 жыл бұрын
This is extremely strange. If I would be inpolite, I would ask you to check your multimeter ;-) I never heard of something like that
@TheProCactus8 жыл бұрын
onboard regulator ? :P
@AndreasSpiess8 жыл бұрын
Good idea. That would explain it!
@AndreasSpiess8 жыл бұрын
5 volt tolerant usually does not mean Vcc. It means, that, even if Vcc is only 3.3 v, the pins support 5 volts because they have protection circuits. The data sheet clearly says, 3 - 3.6 volt, and if the chip survives higher voltages, that is nice, but not very important for me, because I try to keep things inside the specs. I went up to 4.2 volt and the current started to increase considerably after about 3.7 volt. It is well possible that you get more output performance with a higher Vcc. That is to be expected, as long as the chip survives...
@MPElectronique7 жыл бұрын
Andreas what if i power the esp with 1 lipo if its full... 4.12v will it burn the esp ? Also a 1200 maH is enought ??
@AndreasSpiess7 жыл бұрын
The ESP specs go ut to 3.6 volt. So, it is better to use a LDO to reduce the 4.1 volts. Will probably not burn, but you never know. You have to check how long your 1200 mAh last and compare it with your expectations.
@ChaplainDaveSparks7 жыл бұрын
Actually, LiPo does come in the AA form factor: the 14500. Also, rather than using a linear regulator, you could use a buck or boost converter with most of the chemistries to not only get the needed voltage, but it could be regulated and the battery could be protected against overload and over discharge.
@AndreasSpiess7 жыл бұрын
Thanks for the feedback concerning the AA form factor. Buck- and boost converters are great for big voltage differences. But they usually have higher quiescent currents. So, they are not ideal for deep sleep scenarios. And for small voltage differences, for me, they are an overkill (and also can introduce RF).
@YonyMuneton8 жыл бұрын
Hi Andreas, Thanks for this excellent video very helpful to me, Have you work with any kind of charger for LIPO batteries?
@AndreasSpiess8 жыл бұрын
I have two different Chargers: One balancing charger (IMAX B6-AC Charger/Discharger 1-6 Cells) for big batteries and a small one: www.aliexpress.com/item/Liitokala-lii-260-18650-26650-16340-Lithium-Battery-Charger-Detection-of-Battery-Capacity-internal-resistance-voltage/1619052072.html All Other batteries are charged with the bench power supply.
@YonyMuneton8 жыл бұрын
Thank you Andreas!
@DavideNastri5 жыл бұрын
Hi Andreas, thanks for this amazing video... Do you think I can use similar batteries to power the Ikea Motion Sensors? (They use two cr2032 3v batteries but they die every week :( )
@AndreasSpiess5 жыл бұрын
If they die every week something must be wrong. Eitehr the design or the usage pattern.
@DavideNastri5 жыл бұрын
@@AndreasSpiess Hi Andreas, thanks for answering... I've changed the product 3 (three!) times and it behaved always in the same way... The last time, fortunately, it worked. Maybe they had a broken batch, I don't know.
@tahreemkhan24866 жыл бұрын
Hello sir. the esp8266 in my project needs to be constantly connected to wifi whenever it is on & needs to be portable as well. I am thinking of using LiPo battery with TP4056 as a rechargeable battery solution for this. Do you think this will work fine?
@AndreasSpiess6 жыл бұрын
As long as the ESP gets its 3.3 volts it will be happy. As shown in this video.
@olgaykorkusuz62105 жыл бұрын
I think one important point is missing. The end users are very prone to put something in the wrong direction. So in order to not to burn your IC' s you should place a low forward voltage diode (schotky maybe) in series to your power supply design. Otherwise someone will insert the batteries in wrong direction(Murphy Laws)
@AndreasSpiess5 жыл бұрын
You are right if you want to sell your product. But a diode loses a lot of power. So it is up to you to include one.
@olgaykorkusuz62105 жыл бұрын
@@AndreasSpiess But a diode saves you from having to use a regulator (thanks to forward drop) if you don't need so much current. And everyone can make mistakes including the designer.
@Philsosopher4 жыл бұрын
Can a solar panel be connected to a power bank which can be connected to an esp32 module? I tried using a solar panel but then I need to add a rechargeable battery and then a battery current monitoring circuit as well to make sure that the battery doesn’t get overcharged. All of that requires a lot of materials. So I thought connecting a power bank would be a better option since it already has comparators, resistors and all that.
@AndreasSpiess4 жыл бұрын
All these things have to fit. You have to do your research and find projects which do what you want.
@lukider118 жыл бұрын
Hi Andreas, im planning a project where the Esp sleeps and wakes up when a button is pressed. I need a battery solution with a low idle (deep sleep) current. What would you recommend? I was thinking of a lifepo4 directly or an 18650 with an Pololu S7V8F3 (0,1mA idle current) Greetings from Germany
@AndreasSpiess8 жыл бұрын
I just looked at the S7V8F3. I am not sure, if this small current is only during shutdown. Then, it would be useless. If you go with Lipo, a much cheaper solution exists: Just look my video #58. Or you go with LiFePo4. Then, you do not need any regulator.
@lukider118 жыл бұрын
thanks for your inspiration, lifepo4 works great. I got the Idle-Current down to 18uA. Combined with a PIR Sensor (40uA idle) i got an awesome Securtiy System for cheap. Keep up the good work, your channel is my favourite ESP8266 and arduino related channel
@waltsteinchen7 жыл бұрын
I have a bunch of motion detectors which are running on a 1 cell 3.7V LiPo battery. To avoid recharging them I tough of installing a 3.7V power supply to each of them to basically power the motion sensors form the power supply and use the LiPo only if main's power is lost. Is this possible ? .. Without mains it takes several days to discharge them below the critical 3V, so not a problem from the undevoltage side. Does this work ? Many thanks!
@AndreasSpiess7 жыл бұрын
You always can connect a device in parallel to the LiPo. There are two things to be considered: 1. At the beginning of the charging, LiPo chargers use a constant current. If you connect a device in parallel to your battery, the current used by the device will not charge the battery. In your situation, this should not be a big problem, because you have plenty of time for that. 2. LiPo chargers charge up to 4.2 volts. In you scenario, you would always have 4.2 volts across your device, because your battery would always be fully loaded (unless power out) There is one thing I do not know. The chargers switch somehow between constant current and constant voltage mode. I do not know, if this "switching" is influenced by a parallel load, which always draws some current. If this current is small, I assume, it would create no problems.
@waltsteinchen7 жыл бұрын
Thanks a lot Andreas!, My initial idea was to just parallel a 3.7V = (no "Lipo aware loader") which is probably not a good idea .. don't know if they would load at all ... , but I now realized that the devices have a built in Lipo Loader chip I can use .. so no problem!
@AndreasSpiess7 жыл бұрын
:-)
@StevePotter6 жыл бұрын
Great video! What about lead acid gel cell batteries? I think they might have better cold charging tolerance than the LiPos and come in a wide variety of sizes at ~2V/cell. For non-flying applications, their density (heavy mass per cell) is not a problem, and in fact was a benefit when the wind was strong and my project box did not blow down!
@AndreasSpiess6 жыл бұрын
You are right. If you have no space constraints this is probably the best solution. And also well known over many years.
@michaeltucker86453 жыл бұрын
What about a older battery tech for stationary devices like weather station etc the 1.2v nickel iron Edison batteries. Easy even make them yourself and with the discharge of the boards you could run one years on a 3s set up
@AndreasSpiess3 жыл бұрын
You can do that if you have them available, I think.
@Electromaniaworld8 жыл бұрын
Dear Andreas, thanks for this video, i have been really looking for something like this to understand which battery i can chose for remote toy car i am planning to make for my kid using power hungry esp8266. i just have a very small suggestion, if you find it appropriate, generally all such videos you make about comparisons and evaluations of different concepts, equipment or things, are full of very useful information. can you at the end make one slide with conclusions - in text form. because it helps in remembering the final outcome of the study.
@AndreasSpiess8 жыл бұрын
Good idea.But it is not easy because my videos usually are already compressed. But I will think about it. Concerning toy: motors are usually power hungry and need higher voltage. So, LiPo is probably the best solution. And a regulator for the 3.3 volt. The ESP will anyway use much less current than the motor.
@SA-oj3bo5 жыл бұрын
Are there ( rechargeable) batteries that can work good at a cold winter ( - 20 ) and hot summer ( +50) and still give high peaks of current for a 2G modem? Thanks for your feedback.
@AndreasSpiess5 жыл бұрын
Car batteries work also below zero.
@SA-oj3bo5 жыл бұрын
@@AndreasSpiess But I meant small ones, for IoT devices... 2-10000 mAh... for example to track a bike
@funcle85727 жыл бұрын
Supposing I am using a Lifepo4 battery, would I still need to use a 1000uF capacitor near the ESP8266 so to protect it?
@AndreasSpiess7 жыл бұрын
The Capacitor has nothing to do with the battery technology. It makes sure your ESP gets enough current during its short sending cycles.
@funcle85727 жыл бұрын
Thank you for clarifying this
@saintpine7 жыл бұрын
Good cross examination. I would be nice to design a circuit that has the MCU check the battery voltage and switch on a voltage doubler circuit when the battery voltage runs near the shutoff voltage. I suppose we need to check the balance because we introduce a new circuit that has it's own consumption, but we might be able to compensate it due to the extra charge we can use from working to lower voltages. I know the LT 1026 can work as a voltage doubler but unfortunately it's not a low voltage low power chip, I don't know of any other versions.
@AndreasSpiess7 жыл бұрын
I am not a fan of these designs because the batteries do not have a lot of energy left at the end of their "life". It adds complexity, size, and cost and I would invest all three in a bigger battery. "This provides more bang for the buck"
@pauldusa7 жыл бұрын
Hello,, I use NiZn Rechargeable Batteries , I was surprised they were not part of your battery comparison ?
@AndreasSpiess7 жыл бұрын
I did not have them at this time. And I think, they are not very common. What is your experience with them?
@DiyintheGhetto8 жыл бұрын
Hello Andreas I have a question that is not related to the esp8266 but to the batteries it's self. I have a audio amp module that will boost the speakers on my headphones because they are very low no matter if the volume is 100% the headphones are still low. now I have tested this module and it boost the audio level by 1/4 boost which is great but it is 5v. now I know I would need some kind of buck boost conveter and battery to make it portable. but which one battery can I use? sense the module takes 45ma to run. I'm trying to. put it in a think smaller case I cam find to stick in my pocket.
@AndreasSpiess8 жыл бұрын
For this case I would use a 9 volt battery and a simple linear regulator. This is small and cheap and you can replace the battery whenever you need it. According google, 9 volt batteries have a capacity of about 500 mAh. So, your amplifier should run about 10 hours with one battery. Boost converters use high frequency and this can create noise in your headphone.
@DiyintheGhetto8 жыл бұрын
+Andreas Spiess I'm thinking of using rechargeable aa batteries for my project or triple aaa batteries.
@AndreasSpiess8 жыл бұрын
If you have the space this is a good idea.
@igorilkevich20918 жыл бұрын
700mAh at 3.2V = 2.24Wh. And seems to cost ~$3. For that price you can get NCR18650B (3.25A*3.6V=11.7Wh) or similar. Even lowered by 20% with LDO it still seems that regular 18650 is 4-5 times better deal.
@AndreasSpiess8 жыл бұрын
If you only look at the dollars, you might be right.
@zjaranyjoe74562 жыл бұрын
So if I want to use 3.7V Lipo cell what kind of regulator I need?
@AndreasSpiess2 жыл бұрын
I usually use an HT7333
@message2prateek3 жыл бұрын
Is there a tp4056 equivalent for LiFePO4 batteries? I want to switch to using LiFePO4 batteries, but need easier solution for charging and overdischarge protection like tp4056 is for 18650 batteries.
@AndreasSpiess3 жыл бұрын
I did not search for it so far.
@sekharjavvadi4 жыл бұрын
hi sir my sekhar from india just suggest what are the best batteries for esp8266 door sensor and esp8266 with motion sensor we are going to do with sleepmode option in it
@AndreasSpiess4 жыл бұрын
You decide. I just provide you with the basic know-How.
@jasondaniel35943 жыл бұрын
What about a cr2 camera battery? They are lithium manganese batteries, rated at 3V and have a relatively good discharge profile. They can also delivery high currents when necessary?
@AndreasSpiess3 жыл бұрын
3 volts max is a bit low for 3.3 volt chips. Otherwise it is ok, I thing.
@jasondaniel35943 жыл бұрын
@@AndreasSpiess Thank you for your response Andreas. I have decided to use 2x 18650 Li-ion batteries with a 3V3 regulator.
@jec_ecart20 сағат бұрын
LFP looks the best. Because it's safe and I can have peace of mind.
@2MOSFET4 жыл бұрын
What type of non rechargeable battery would you recommend to power 3.3V devices? Thank you
@AndreasSpiess4 жыл бұрын
Did you watch the video?
@2MOSFET4 жыл бұрын
@@AndreasSpiess till the end
@giagales30515 жыл бұрын
Is Lifepo4 battery also suitable for ttgo sx1278 lora esp32? Thank Mr. Swiss for the response
@AndreasSpiess5 жыл бұрын
I do not think so. It has different voltage levels
@yengamatic8 жыл бұрын
Where does that "20% loss from the regulator" come from? Apologies if I missed that in the video, but did not seem clear to me. Is it because of the quiescent current? In that case it would depend on the regulator itself.
@AndreasSpiess8 жыл бұрын
Arturo Ribes Every linear voltage regulator needs a voltage across it. If yor battery has 3.7 v and the output of the regulator is 3.3 v it "destroys" the 0.4 volt. Multiplied with the current, you get the watts.
@yengamatic8 жыл бұрын
If I understand correctly, it depends on 2 factors: a) The dropout voltage of the regulator (150mV for HT7333) and b) The minimum operating voltage of the IC (ESP8266 is 3.0V, although I guess it may be lower). Then you should check at which capacity the battery is discharged below IC_min_voltage + regulator_dropout (in the example for ESP8266 + HT7333 would be 3.15V) and that would be your maximum capacity. So it may be 20%, but I think it is not as easy a calculation as saying "it destroys the 0.4volt". However, I may be wrong, no expert here :P
@AndreasSpiess8 жыл бұрын
I mention two sources for the 20%: 1. If your average battery voltage is 3.7 v and the output of your regulator is 3.3 v, then you loose 0.4 volt. Divided by 3.3 v is roughly 10%. 2. In addition, the module stops earlier because of the drop-out voltage. I do not know this number, because it differs from module to module , but assumed another 10%
@yengamatic8 жыл бұрын
Ok, thanks for the clarifications. You have an awesome channel, keep up with it!
@AndreasSpiess8 жыл бұрын
Thanks!
@underwoodblog8 жыл бұрын
Hello, there are 3,7 LiPo rechargeble batteries in AA and AAA format. Eaven with protection curcuit like the big well known 18650. I use them in many flashlights, than can run on higher voltages. There are also lots of new formats, like 18350 (slightly bigger than the 123A Lipos 16350) or 16850 (size equivalent to two 123A). Search for 10440 (AAAS) and 14500 (AA).
@AndreasSpiess8 жыл бұрын
I think, this is a big advantage of the Lipos: You get them in many different sizes. Good to know how to find tehm. Thanks! For me, the square sizes are also quite handy
@underwoodblog8 жыл бұрын
You can find the square ones in all shapes at hobbyking.com If you buy "Turnigy" or "NanoTech" you get the capacity, that is printed on. For excample: I've super tiny NanoTech 300mA Square Lipos that support discharge rates up to 90C!!! The IMR LiPos are interesting to, if you need high currents. The capacity/size factor is lower but a 18350 IMR can deliver up to 8A and the IMR are a little robuster than the normal LiPos.
@papaiatis7 жыл бұрын
At 5:20 on the picture the two middle batteries say "LiFePo4" but the two batteries on the edges say "FePo4". They all seem to be the same battery, but its just weird.
@AndreasSpiess7 жыл бұрын
Yes, you are right.
@mschorer5 жыл бұрын
Perfect Video and super useful!!!
@AndreasSpiess5 жыл бұрын
Thank you!
@markludwig58055 жыл бұрын
Great videos. I’m using an ESP 12E, 1000mah, LiPo battery, LDO regulator, and AC to DC power supply to monitor AC voltage at my cabin. I send emails every hour. When I lose AC power the battery keeps the ESP8266 working, drains down and the esp8266 goes into a brown out condition and won’t restart when AC power is reapplied to battery/esp8266. How do I automatically restart after a long power failure? Maybe I could measure VCC of ESP8266 and go into deep sleep. What do you recommend? The key here is to automatically restart the ESP 8266 when power is returned. Thanks for your feedback…..Mark
@AndreasSpiess5 жыл бұрын
You can use a so-called "voltage detector" to keep RST low till the voltage is appropriate to start (KA75330, for example)
@markludwig58055 жыл бұрын
@@AndreasSpiess Great advice...Got some on order...will let you know how it worked out in 30-50 days.
@markludwig58054 жыл бұрын
@@AndreasSpiess I have a 5 vdc power supply and a LiPO battery and HT7333 voltage reg powering my esp12 project. The 5 vdc power supply also recharges the LIPO thru a 1N4007 diode. When the 5vdc goes away the esp12 runs on the LIPO battery. When the battery reaches a very low value in a few days, the esp12 would brown out and would not restart when 5vdc power supply was applied. Your KA75330 voltage detector idea worked for restarting the esp12 successfully, that problem solved…but as the LIPO reaches approx. 3.80 volts the KA75330 resets constantly over and over for hours until the LIPO finally shuts down below 3.5 volts. When the 5 vdc power is reapplied the KA75330 begins resetting the esp12 for hours until the LIPO reaches 3.8 - 3.9 volts and is charging. Not sure if hammering the reset for hours is a good thing….do you think it might corrupt my esp12 program? Maybe I could use a KA75310 or KA75290 voltage detector and shut down the esp via ESP.getVcc() into DeepSleep based on Low VCC ESP.deepSleep(0) at around VCC = 2.90-3.10 volts before it gets reset over and over. I’m finding the KA75310 or KA75290 voltage detectors are not available on Banggodd, AliExpress, ebay or amazon. Bummer. I think I’m OK but what are your thoughts about my approach, especially about the constant resets. Thanks…great videos as always.
@cristianchuquitarco37943 жыл бұрын
Se puede conectar una batería de 5v por los puertos Vin y gnd del esp8266?
@AndreasSpiess3 жыл бұрын
Only if your board has pins which are labeled 5 volts. If not, the maximum voltage is 3.6 volts.
@MaxSMoke7777 жыл бұрын
I am still very confused about how to actually get a LiPo *into* the 8266. I hear about regulators, step up, step down, lots of things I can't seem to find any good information about. There seems to be alot of assumed knowledge about batteries out there which makes it very hard for beginners to grasp. I'd love some LiPo clarification, because those nice little square batteries look so impressive, but using them is still beyond me.
@AndreasSpiess7 жыл бұрын
To power the ESP866 you need 3.3 volts. If your battery or other power supply has more than these 3.3 volts, you need a step-down regulator or converter (two names for the same thing). If your battery has less than 3.3 volts you need a step-up converter. You can buy linear or switched step-down converters, but only switched step-up conveters. Step-down converters are also called "buck converters" and step-up conveters "boost converters"
@Ericjsime6 жыл бұрын
I’m a year late to this conversation but I hope I can still get a response. I have been siring an 18650 with a diode between my ESP and the battery. The voltage drop across the diode gets me right in the sweet spot of 3.3v. But is there some downside to doing this. It seems to easy.
@AndreasSpiess6 жыл бұрын
There is a downside: At the end of battery life you also drop 0.7 volt. If you want to stay inside specifications of the ESP you can use your battery only till about 3.6 volts and lose a big part of the capacity.Good LDOs only drop 0.15 volt minimum and you can go to 3.2 volt.
@ePortalHub5 жыл бұрын
Thanks for the video.. if im using lipo 18650 cell for esp8266 do i need to use 18650 discharge protection?
@AndreasSpiess5 жыл бұрын
You always should if you do not want to monitor it manually.
@ePortalHub5 жыл бұрын
@@AndreasSpiess thanks for the quick reply. what is the best time to recharge at what voltage? And suppose if i forgot to monitor battery got discharged below 2.5v will it smoke/fire?
@AndreasSpiess5 жыл бұрын
It might start smoking when you recharge a deeply discharged battery
@kaikart1233 жыл бұрын
I know I am late but just use TP4056
@TedRobotBuilder8 жыл бұрын
you should not have overlooked the advantages of NiMH cells. They can handle over charge and over discharge which the Li batteries cannot. They do not explode or leak. If you need durability and rechargability, they are the clear winner.
@AndreasSpiess8 жыл бұрын
I did not pay too much attention to this technology because I assumed, it is well known by my viewers (it is a relatively "old" technology). But you are right: They have the advantages you describe over the Lipo.