#58 ESP8266 Sensor runs 17 days on a coin cell/transmits data (deep-sleep)

In this episode I show how a ESP-07 or ESP-12 measures its voltage and transmits it to data.sparkfun.com and ubidots.com. If it transmits every 2 minutes, it ran 26 hours on a small LIR2450 button cell. If it would transmit each hour, it would last for 17 days and on 2 AA batteries 425 days.
Sketch: github.com/SensorsIot/ESP8266...
Rainer Ochs: www.esp8266.com/viewtopic.php?...
Base64: www.base64encode.org/
HT7333 voltage regulator:s.click.aliexpress.com/e/ciskloDS
Official Wemos Store: s.click.aliexpress.com/e/jUzBiIq
Calculator to calculate running time: battery-life.of-things.de/batt... or batterylifecalculator.iobot.in/
If you want to support the channel and buy from Banggood: bit.ly/2jAQEf4 (no additional charges for you)
/ andreas-spiess-7331894...
/ spiessa

[@asiw]

Fantastic. Love the clarity of your explanations and the level of detail that you include. It has given me lots of ideas to experiment with and your Sketch is a wonderful starting point. You make life with the ESP8266 much easier that it would otherwise be.

[@AndreasSpiess]

Thanks for your nice comment. I am glad I can help. This is why I do my videos. I also learn a lot from other videos.

[@DM-qm5sc]

Thank you for the time you take to make these videos, and for sharing your knowledge!

[@AndreasSpiess]

You are welcome. I am glad if people like you watch them. So, it is worth the work...

[@youreale]

Thanks for posting such detailed work in this series. Very appreciated!

[@AndreasSpiess]

You are welcome!

[@DaveHuntMaker]

Excellent video, Andreas. Great info on the regulators! :)

[@AndreasSpiess]

Thanks!

[@DRI1966]

Thank You again Andreas for this well presented and elaborate project. I learned a lot in this short time, I was not aware of the HT73xx , great thing to use in my future projects. Thank You again and stay safe. Best Regards, Didier (From Belgium ... The country of the best chocolates in the world ;) )

[@robertkes]

I have to say, I love it. I already learned more than I expected today!

[@AndreasSpiess]

+Robert Kesek Very good! Thank you for your nice comments.

[@jct4647]

Brilliant video +Andreas Spiess, thanks.

[@AndreasSpiess]

+Johan van den berg You are welcome!

[@mt-qc2qh]

Great coverage, Andreas. Keep them coming!

[@AndreasSpiess]

+m t Thanks!. The next two are already in the works.

[@zekoboss810]

I have not seen anyone explain better than you Thank you♥

[@AndreasSpiess]

Thank you for your compliment!

[@robertparenton7470]

Thank You for Valuable Videos and Your Time. I appreciate all!

[@AndreasSpiess]

You are welcome!

[@Educ8s]

Great video! Thanks for sharing!

[@AndreasSpiess]

+educ8s.tv You are welcome.

[@xennelul]

I ran my ESP8266 from a 400mah Li-Ion battery for 20 days, measuring battery voltage at 10 minute intervals. Thanks again for your awesome and inspiring videos!

[@AndreasSpiess]

+xennelul Thanks for your feedback. Glad it worked

[@Peter_S_]

You make excellent videos! Thank you for your work and educating others (like me)!

[@AndreasSpiess]

You're welcome!

[@jeffhill6769]

Really appreciate your great work on these videos. Tremendously instructive!

[@AndreasSpiess]

Thank you!

[@saintpine]

I'm from the other side of the Alps, I enjoyed your video, well done. And obviously I subscribed.

[@AndreasSpiess]

We here love your side of the alps (especially in these cold times)...

[@gucluceyhan]

Andereas great video(s). I really like the way you approach the subjects. Really great work(s) and appreciate it!! Thank you!

[@AndreasSpiess]

Thanks for your nice comment!

[@BBConraD]

It was a great work, Mr. Andreas. Thanks for sharing and very helpful information. Respects...

[@AndreasSpiess]

You are welcome!

[@3amali1]

17 people have pressed the dislike button,, Seriously?! the guy is giving you free knowledge and you give back a dislike!

[@AndreasSpiess]

+Ehab Saleh ايهاب صالح There are always a few dislikes. But usually without comment.

There is no need to worry about dislikes on a video. Consider them as "noises".

[@Jemacaza]

probably uncontrolled spasms of excitement

[@tbyte007]

Some people press dislike accidentally and never notice. And it goes from grey to black which is really far from a bright idea :)

[@BarackBananabama]

They are battery sellers. Any information regarding low power usage sucks.

[@CarlosEcheverriaOne]

Sure is an interesting topic to give the best attention possible. For sure my dear Switzerland accent guy, that was a delightful explanation of battery consumption on ESP-8266 module. Thanks a lot for sharing soo good knowledge..! 😃😃

[@AndreasSpiess]

You are welcome!

[@Slider2732]

I kept pausing to go and buy things LOL For example, those HT7333's have replaced my LM1117's now after this great video ! Very enjoyable and informative Andreas, thanks.

[@AndreasSpiess]

I think, the HT7333 are a very good replacement for the 1117 and not very expensive...

[@RichardEricCollins]

LoL I did that with the last video of his I watched. :)

[@DrTune]

worth pointing out that there is some tradeoff between quiescent current and maximum input voltage; HT7333 only goes up to 12v; LM1117 up to 20v, last time I looked this seemed consistent across LDOs

[@davidhsieh2761]

And 250mA max but the LM1117 thing will run way too hot at 20V...even at 12V with a high enough current draw

[@tigransardaryan9298]

use MCP1703 or MIC5219 (if you need to be able control flow) instead

[@benfletcher7209]

Really enjoyed this video and found it very informative, its fantastic to be able to learn like this. Thank you Mr Spiess

[@AndreasSpiess]

You are welcome! There are a few more videos on ESP8266 and the newer ESP32 on my channel...

[@9549549543]

Hi Andreas, Hope you are keeping well.. I am not a technical person your explanations in this video is very easy to understand. I watched on ESP 8266 more than 100 video really its very helpful in my project.

[@AndreasSpiess]

Thank you for your feedback. I am happy if my videos are helpful for others achieving their goals.

[@JeremieFrancois]

Outstanding, complete and clear work. Second time I stumble upon one of your videos, I'm definitely a subscriber now :)

[@AndreasSpiess]

+Jeremie Francois Thank you for subscribing! Statistics show, that still 75% of my views come from not-subscribed viewers...

[@JeremieFrancois]

Andreas Spiess yep, I am also surprised that my 20K views/month blog is also invariably and overwhelmingly composed of newcomers. The outer world is always bigger I guess :)

[@pjwlk]

Thanks Andreas for another great video. I've learned a few things today.

[@AndreasSpiess]

You are welcome!

[@hvanmegen]

episode numbers: +1, english much improved: +1, calculations explained: +1 ... you're awesome, thanks for these nice and informative videos!!

[@AndreasSpiess]

+Henry van Megen Thank you for the nice comment.

[@alphonsesynrem28]

Always good!! Very informative and detailed, I didn't know much though, sorry. Thank you. I am learning new things watching your hard works.

[@AndreasSpiess]

:-)

[@glikar1]

Thanks Andreas, I've often wondered how to calculate loads vs capacity. Using ma/sec and cycles makes sense.

[@AndreasSpiess]

:-)

[@artlasvegas2004]

Video is a little old, but, THANK YOU VERY MUCH for all the time you put in to give so much knowledge back to the WORLD. Always enjoy you r videos lessons.

[@AndreasSpiess]

Thank you!

[@maruanjaber913]

Excelent video! Congratulations and thank's for sharing with us!

[@AndreasSpiess]

You're welcome! I also learned a lot with KZbin.

[@rubenfernandez9603]

Wow! Thanks for your time creating this great videos :)

[@AndreasSpiess]

You're welcome!

[@id513128]

Wow! Awesome. I live your solution for current spike. Thanks.

[@AndreasSpiess]

You are welcome!

[@salomondenis9751]

Thank you Adreas, very usefull information.

[@AndreasSpiess]

You are welcome!

[@mmendesrs]

Very good explanation with all hardware details!

[@AndreasSpiess]

Thank you for your compliment!

[@aleksandertoth8764]

Thanks for the explanations. This regulator will help me a lot.

[@AndreasSpiess]

Glad to help!

[@KobyLev]

Excellent video, interesting educational and practical - I've enjoined watching it.

[@AndreasSpiess]

Thanks for the compliment!

[@andreyhinov8147]

Fantastic work!

[@FrerkMeyer]

Excellent video. Exactly what I'm interested in when it comes to smarthome nodes based on the eps8266. I would send the data to my in-house openHAB server running on Raspi2, but that's the same from the viewpoint of the esp8266. My witty boards are in the mail and I can't wait to experiment with them.

[@AndreasSpiess]

+Frerk Meyer The witty boards might use current higher current also in sleep mode unless you disconnect the base PCB (which contain the serial to USB chip) and disconnect the LM1117 power regulator which is on the board itself. Or you do not need deep sleep. Then, the witty boards are ok.

[@ddavid2]

These videos are great! Many thanks!!

[@AndreasSpiess]

Glad you like them!

[@arcadeuk]

Very informative and very well presented!

[@AndreasSpiess]

+arcadeuk Thank you for your nice comment!

[@jeffthom3155]

Another great video . Congratulations on teaching.

[@AndreasSpiess]

Thanks!

[@miltoneduardososa378]

Sehr Interesantes Video! Sie haben die Spannungsregler und Kondensatoren (im video #47) wahl methode sehr gut erklären. Vielen dank für teilen ihre Ergebnis.

[@AndreasSpiess]

Bitte, gern geschehen!

[@jchen9614]

Good work,I am glade to see the wonderful video,thank you! This video solve my lots question

[@AndreasSpiess]

Good to know that I can help!

[@EasyOne]

Very well explained

[@AndreasSpiess]

Thank you!

[@Mrityunjai-IN]

Well explained sir ! Thanks for sharing.

[@AndreasSpiess]

+Mrityunjai Kumar You are welcome.

[@myounges]

Excellent video thank very much Andreas!!!

[@AndreasSpiess]

You're welcome!

[@stfm]

Really impressive. Thanks for this Video. Very interesting.

[@AndreasSpiess]

You're welcome!

[@subbuiyer8377]

Brilliant video! thanks for this!!

[@AndreasSpiess]

You are welcome!

[@thinkwareltd]

Thanks for your post. Most interesting.

[@AndreasSpiess]

You are welcome!

[@niniliumify]

Talk about "Power Napping"! ~excellent presentation~

[@AndreasSpiess]

Thanks!

[@wojciechlipinski7258]

Good job sir!

[@AndreasSpiess]

Thanks!

[@Bob3519]

Thank you for the information.

[@AndreasSpiess]

:-)

[@stu110]

Another great video, thanks! :)

[@AndreasSpiess]

+stu110 Thanks for the compliment.

[@ToastersScareMe]

almost a year late... but great video, thanks so much i learned a bit, time to start researching everything deeper

[@AndreasSpiess]

Thanks! There are a few other videos from me concerning this topic. You find them in a playlist

[@Maaututorial]

Thank you this was what i needed:)

[@AndreasSpiess]

+Maaututorial You are welcome!

[@rodstartube]

lol i read ubidiots.com instead of ubidots.com when clicking. great content as always. i'll have those HT7333's in my mind to enhance some projects. thanks!

[@AndreasSpiess]

+rodstartube The first ;-)

[@EZtech]

Please put the next episode on the FedEx truck, I can't wait to see more! The suspense is killing me. I took a cursory look at the code but can't figure it out. I have an esp8266 adafruit feather with a 3.7v lion 500mah battery and was getting just 4 1/2 days updating "adafruit io" once every hour. The esp would only go to sleep for one hour max. Great video, I don't see where you find the time for all this stuff.

[@AndreasSpiess]

+Revelation612 The feather has also other chips which might use current even if the ESP is in deep sleep (e.g. USB interface). This board is probably better for development.

[@plasticmirror]

im glad that youtube provides the option to step up the playback speed ... :D

[@PachaTip]

Thanks you very much for knowledge

[@AndreasSpiess]

You are welcome!

[@XerotoLabs]

great info as ever . very clear and easy to fallow .

[@AndreasSpiess]

+XerotoLabs You are one of my "closest" subscribers. Thanks a lot.

[@XerotoLabs]

+Andreas Spiess you have a great way of explaining stuff and your videos always provide new things for me to think about . now i have a use for all those old Lion and Nimh cordless phone batteries ( N size cells) I have and one si can get form clearance outlets for cheap. I used to use them for ODL R/C stuff before lipo's became a thing . I wonde rhow long and how small a pack you could make using the inner aaaa cells in a '9'v nimh battery ( 7.2v IIRC , some were 8.2 or 9.6v ) . i used to take them apart t get the tiny cells to make my R/C glider's radio packs. those cells were sometimes small squares with tabs , about the size of your big capacitor in your video . some have oblong button cells stacked in them .

[@AndreasSpiess]

+XerotoLabs I just learned from a viewer that LiPoFe4 batteries with a nominal voltage of 3.2 volts exist. These would be ideal for this purpose because their max voltage is 3.6 volt. So, I ordered some and will try. 9V batteries are a bit of an overkill because the regulator has to "kill" the extra volts. I wonder how much current it would use in deep sleep...

[@orlin369]

Great video, just great .

[@AndreasSpiess]

Thanks!

[@BilalInamdar]

Great info dude i m a fan now.... Small detail for Noobs is best. i like IOT but don't have time to read but your video teaches good.

[@AndreasSpiess]

+Bilal Inamdar Good to hear. Then it is worth my work!

[@christopher8199]

great video Andreas

[@AndreasSpiess]

Glad you enjoyed it

[@christopher8199]

@@AndreasSpiess I can't believe you reply to all of these comments

[@AndreasSpiess]

But I do it ;-)

[@CheeKiatTeo]

Great video!

[@AndreasSpiess]

+Chee Kiat Teo Thanks!

[@michaeldallas]

Very good. Thanks!

[@AndreasSpiess]

You are welcome!

[@zebrahuhn5899]

Hi Andreas! Very good video, again. Just one tiny remark: If you have no connection from GPIO16 to reset pin, the ESP does not stay in deep sleep. It (kind of) wakes up in a weird state and does not continue to run the code, but consumes about 15mA. So that's even worse than staying in deep sleep. ;-)

[@AndreasSpiess]

+Zebrahuhn Thanks for this addition. I did not try it myself.

[@the-matrix-has-you]

Hi Andreas, I have managed to descrease esp 12F's Power consumption to 159uA by removing the LDO of Wemos d1 mini I Power it with my custom deep sleep wake shield. The shield is using 100nf in parallel with 100uF in paralel capacitors to HT7333 then HT7333 3.3v output is connected to 100nF polyester film capacitor for filtering purposes then I added 1000uA 3000 hour lifetime %5 capacitor to reduce peaks as you mentioned in the video. Then this Power circuit Powers my deep sleep wake part of the circuit and that circuit itself with Power components just draw 1uA😀 I also watched your PIR sensor videos and I have choosen HC-SR-501 and modified it by removing Diode cause it was lowering the voltage and removed LDO of it then I bridged VIN and VOut of LDO pins now it draws 36,38 uA when it is idle. When my sensor detects movement the wake circuit wakes esp12F from deep sleep and keeps it open until task is done then it goes to deep sleep again. With modified HC-SR-501 PIR sensor my sensors total current draw is 210uA in deep sleep with clone wemos d1 mini😀 with my calculations it will Last for 346 days with 2000mAh Lithium-Ion battery with 3.8 volts with single charge. Thanks for tips for lowering Power. I am also full time 12 years of experience C, C++ and C# programmer so lowering run times was easy. You can lower your connection time even more. My sensors connects the wifi gateway in 500,600ms if you specify mac address😉 I might remove the blue LED as you suggested for lowering consumption even more! Thanks! Keep the content coming we love it😀

[@AndreasSpiess]

Very good work! And thank you for the writeup! With this low current consumption I probably would go for standard batteries as Li-Ion batteries do self-discharging.

[@GreekReview]

nice video !!!

[@mostlymessingabout]

Thank you very much

[@AndreasSpiess]

You are welcome

[@kriptontr]

great vid. thanks.

[@AndreasSpiess]

+Tamer Aktaş You are welcome!

[@sramilli]

Hi, i watched almost all your videos yesterday. They are great, full of precious information! Thank you for doing them :) I would like to ask a more general question. What do you think is the most efficient way (less heat - and not too expensive components) to step down 12V to 5V and 3.3V for Arduinos and ESP8266 to be used in the same project? Thank you!

[@cameron20020]

Did a similar thing with a lifepo4 cell and small (4cm*6cm) solar panel. The idle power usage while the esp sleeps is so low that I had to purposely keep the thing awake to stop the cell overcharging. Surprised it actually matches its datasheet power usage after you disconnect any external circuitry.

[@AndreasSpiess]

It shouldn't be a surprise parts meet specifications ;-)

[@anslan]

Thx rus subtitles. Ставлю лайк за русские субтитры, к сожалению в других Ваших видео они не работают. С удовольствием просмотрел бы и другие видео.

[@AndreasSpiess]

Все субтитры были предоставлены лояльными зрителями. Для их создания много работы.

[@marcin8132]

Amazing!

[@AndreasSpiess]

Thank you!

[@skrame01]

I've had good success with the 2CR1/3n 6V battery for powering small microcontroller current-intensive devices, it will provide 60mA steady and 80mA pulse, 160mAh for Li-ion type.

[@AndreasSpiess]

Thanks for the feedback!

[@mecommenting]

your videos are great !!! don't lose that swiss accent by the way

[@AndreasSpiess]

It would be hard to lose it in my age. No worry!

[@HorstChristophSchreiber]

danke schön!

[@AndreasSpiess]

Gern geschehen!

[@markus1963nl]

For another video, it would be interesting to hear about the rtc memory functions you are calling to keep state between sleeps. This issue of persistence has been on my list for storing known SSID/Password entries entered via AP most. A video on this topic would be really helpful.

[@deangreenhough3479]

I agree, RTC explained by the guy with the Swiss accent is required

[@AndreasSpiess]

+Dean Greenhough In the works...

[@PsiQ]

If not finished yet: how much energy/time would it take to wake up just to get ntp time from router, then go back to sleep. perhaps combine with software correction of time deviation of internal clock. Nice videos & explanations 😄

[@sallerc]

Interesting video, thanks for sharing! Waiting impatiently for my NodeMcu Lua ESP8266 from ebay :) This will help my future project, want to run on battery for a long time.

[@AndreasSpiess]

Just one remark: NodeMCU boards are development boards and not suitable for low power applications because they use a 5V to 3.3V regulator and have a USB to serial adapter on board. Both devices use lots of power even if the ESP is in deep sleep.

[@sallerc]

Good to know, I'll look into using a ESP-12 instead of the NodeMCU for the final build then.

[@sallerc]

This is the capacitor you were using right? www.ebay.com/itm/301749529877 Thanks

[@AndreasSpiess]

+salle rc yes

[@sallerc]

Do you think these would work as well (cheaper), or is 4V to low? www.ebay.com/itm/191697227371 Or possibly another capacitor type, space is not an issue for my application.

[@anandanatarajansubramanian7089]

bulls eye. Thanks +Andreas Spiess

[@AndreasSpiess]

You're welcome!

[@blumenretter3570]

Thank you very much for this awesome and very helpful video! I'm going to give the HT7333 a try now! I hope the module is not too tiny so I'll be able to solder wires to the pins. Do you use a special soldering iron for SMD parts? Greetings from Germany, btw! I don't mind the Swiss accent at all. I like the fact that you speak slowly in the video, so it's easy for me to follow. :-)

[@AndreasSpiess]

Thank you for your nice words! No, I use the normal soldering iron or a hot air gun if I have to solder more than one part.

[@greuve]

Very useful and very interesting ... and I think I learned my first Swiss German word. Gruezi! Mit Hilfe von Bernhard Hofman :) Groetjes!

[@AndreasSpiess]

Thanks! Glad I can spread Swiss German because it is a rare language ;-)

[@blackout57]

I really love the swiss accent, it is the same when then speak french.

[@AndreasSpiess]

:-)

[@kellyanderson7115]

Andreas, I looked up the specs on the HT7333 and it shows the quiescent at ~4mA not 4uA. Also a bit more digging shows the TI TPS78333 using an extraordinarily low 0.5uA, with a dropout voltage of 0.15V, it looks like it would be the perfect regulator for a sensor application.

[@AndreasSpiess]

Kelly Anderson Obviously, there are different data sheets around. Here, it has 4 uA: www.holtek.com.tw/documents/10179/fafea7fe-0c1e-4e6f-be98-64cdc6472624 So, the only possibility is to measure ;-)

[@fromchinaparcel]

Many thanks for the info about HT7333. Will use it in weather station outdoor with one 18650 LiPo battery. Greetings from Russian viewers)

[@AndreasSpiess]

Thank you. Did you see the Russian subtitles for a few videos?

[@fromchinaparcel]

No. I didn't. Can you give me a link? Also could you, please, give me advise: If I want to power my ESP8266 from LiPo18650 and will use HT7333 for stabilisation - it means that i will use only part of 18650 capacity, because HT7333 will stop work at 3,45 V (3.3+dropdown). But lower level of voltage on 18650 (fully discharged) is about 2.5 V. how to use it's capacity from 3.45v to 2.5v ?

[@fromchinaparcel]

I hope you catch my question)

[@fromchinaparcel]

I hope you just forgot to answer my question?

[@AndreasSpiess]

This is not the behavior I accept. I will not answer therefore

[@markus1963nl]

Hello from the Netherlands Andreas. Great video once again. You always come back with all sorts of nice nuggets. The tip about the ADC_MODE(ADC_VCC) and ESP.getVcc() methods was very helpful. How did you calculate the VCC_ADJ at 1.096? I also noticed that BATT_WARNING_VOLTAGE was set to 2.4V. I thought the working voltage levels for the ESP was 3.0 to 3.6v? Or can it go as low as 2.4v? Great stuff again and keep up the great videos. Mark

[@AndreasSpiess]

+Mark Troyer I just used the coding of Rainer without changing a lot. I added the two IOT services and left the rest. So, it is well possible that some of the coding is not yet optimal. It goes for sure below 3 volts, but I think, it depends on the individual chip on how much. The VCC_ADJ: I measured it with a voltmeter and looked what the ESP was measuring. Simple ;.)

[@taogre3760]

Endlech mol en Guete Schwiizer KZbinr Hesch der grad es Abo gholt 😀

[@AndreasSpiess]

Dankschön!

[@jims408]

Hello guy with the Swiss accent. :) What a wonderful channel you have. I am so glad I found it. You explore really interesting topics and explain things very well; easy to understand. I am curious if you are an engineer by training or just picked things up on your own? Thank you!

[@AndreasSpiess]

+jims408 Thanks for the compliment! Yes, I am a trained electronics engineer, but did not work on my profession for years. Now I am old enough to do what I want. Therefore, I started my hobby again. The times are very interesting with all these modules you can get for nearly no money...

[@NightRunner417]

Nice video. Lol at 5:08 I was doing something else while the video played and I stopped and thought, "Whoa... 10,000! Am I that behind the times???"

[@AndreasSpiess]

There is an overlay saying, that it is 1000, not 10000uF. Unfortunately, it is not displayed on Ipad and Iphone.

[@NightRunner417]

No, I saw it. It's just what I heard because I was away from the monitor listening to the video. NOT criticizing you, I just thought it was funny. :-)

[@alessandrodionisivm]

Hello Andreas, thanks very much for your videos and knowledge sharing, so much appreciated. I want to realize a wireless keypad with BLE and I was wondering if it’s possible to augment battery life using ESP 32 deep sleep. Do you know if it’s possible to wake up the ESP-32 pressing a digit while not loosing the input? Thanks!

[@AndreasSpiess]

Maybe you watch my videos about the ESP32, also using BLE

[@le_rockshark]

Danke fur das coole Video :) Grusse aus Russland :)

[@AndreasSpiess]

Bitte, gern geschehen.

[@markus1963nl]

Finally one last video topic suggestion on using the ESP8266, MQTT and security. While I have read on some forums that it is possible to run MQTT securely with TLS1.2 on the ESP using a native C Xtensa development toolchain, it would be really helpful to understand if you have ever explored doing this in an Arduino IDE environment for the ESP8266. Everything I have ever seen with the Arduino IDE is only using unsecured communications. Seems like something seriously holding back the IoT market. A two minute session with Wireshark exposes all hobbiest username/passwords with all of the newest MQTT services.

[@AndreasSpiess]

+Mark Troyer So far I did not try secure communication. I am not sure if it is easily possible ith the EXP8266. My opinion is, that the thigs I transfer are not really important nor are they valuable. So, the chance of a problem is rather small for me. For seure communications we probably have to wait for the ESP32.

[@eduardo9626]

Thanks for the subtitle, if more videos of you had subtitles the success of this channel that already is very good would be even more. How would you like more subtitles in Portugues

[@AndreasSpiess]

I completely depend on my subscribers for the subtitles. I even started a project once. This is why some videos have subtitles. But the project was not a big success.

[@CristianSzwarc]

great info!, regarding email... I'm using pushover to receive messages directly to my phone from some projects. it is a paid app but totally worth it (is "free" to send notifications up to a limit and you need to buy the client app), keep posting

[@WUTUcz]

Try to look at Pushbullet. Its free.

[@TheUnofficialMaker]

me too. and very fast I have found.

[@CNLohr]

Andreas, I intend to use a small bit your video, talking about it in my video. Do you have any issues with that? I am specifically talking about your video and will link it.

[@AndreasSpiess]

Hi Charles, not at all. I am honored to appear on your Channel :-)

[@CNLohr]

Check your youtube inbox.

[@arthurcastell3517]

Thank you for the great videos, they seriously are very inspiring! With respect to battery runtime I am still trying to figure out which is the best minimal setup for a bare ESP12F module (using FTDI for programming). I understand that you need the following pins connected: CH_PD/EN => Pullup; GPIO0 => Pullup (for running; GND for programming); GPIO15 => Pulldown. And, for stability reasons: GPIO02 => Pullup; RST => Pullup; Electrolytic capacitor 1000uF between VCC and GND (as pointed out in one of your videos). What are the best values for the external resistors (sometimes I read 10k and sometimes “the smaller the better”) if I am looking for minimal energy consumption and/or stability? Some pins have internal pullup/-down resistors would they be a better choice than external ones? And does the maximum voltage level of a capacitor does have any influence on energy consumption? I know, a lot of questions, but maybe you can help shed some light?

[@AndreasSpiess]

1. 10k should be ok 2. Big tantalum capacitors have a leakage current of a few uA. Conventional capacitors should be better

[@fuzzie4755]

Hi Andreas, you use also the quite big white board to solder the ESP on it. Do have found in the meantime a smaller version that has the size (width) of the wemos shields? I see still only on aliexpress the white boards from the video. I really like the already included pullup resistors and the place to solder the voltage regulator. All great. Just a little big too big for my outdoor housings.

[@AndreasSpiess]

+Stefan Bode No, I never searched. Maybe you create your own. At Osh park they do not cost a lot...

[@yurymetphosis5766]

Those 6.3V 1000uF SMD Tantalum Capacitor had a leakage current of around 60uA too.

[@AndreasSpiess]

You are right. I had to learn that fact later on.

[@johnacsyen]

Hi Andreas, I want to use either a coin battery or AA battery to power a Wemos D1 mini, is it correct to connect it to across the 5V and Gnd terminal and what is the value of the capacitor across 5V and Gnd. Thanks

[@AndreasSpiess]

Wemos are not very good for battery operation. There are a few videos in my ESP8266 playlist concerning the topic of power.

[@dallatorretdu]

I was looking for something like the ST1L08 or the LDFM voltage regulator, but it's quite hard to find. I really liked the option to shut it down digitally...

[@AndreasSpiess]

I think, you find also other LDOs with that property, I just do not remember, which one

[@gordonw9208]

I have a LM1117 that i use to provide 3.3v for breadboard projects. It uses 10mA all the time, so not good for battery use. The HT7333 sounds promising for my solar powered esp12.

[@AndreasSpiess]

I agree