Homemade Digital Electronic Load | Multiple Modes

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🔥This is a second version of the electronic load. This version is digital and has modes for constant current, constant power and constant load. It will measure current, power, voltage and print everything on the screen. Easy to control with a rotary encoder.
ELECTRONOOBS.io: electronoobs.io
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LINKS
-------------------------------------
Tutorial: electronoobs.io/
Tutorial Webpage: electronoobs.com/eng_arduino_...
Part list: electronoobs.com/eng_arduino_...
3D STL files: electronoobs.com/eng_arduino_...
Schematic: electronoobs.com/eng_arduino_...
Schematic with OPAMP: electronoobs.com/eng_arduino_...
Code: electronoobs.com/eng_arduino_...
Test video: • Electronic Load - Patr...
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#Electronic
#load
#Homemade

[@ELECTRONOOBS]

Sign up at ELECTRONOOBS.io: electronoobs.io/ Follow me on FACEBOOK for more: facebook.com/Electronoobs help me on Patreon: www.patreon.com/ELECTRONOOBS

[@grodiosp8916]

Why do u put a banana in all your videos???

[@mubbashirshirazi3758]

hey electronoobs it would be a good idea if this project can be used to test the capacity of 18650 batteries by measuring how much current it delivered for a certain time and than display results in the end please please make another version with this improvement

[@lexander9686]

What's up with the Q&A

[@boonematias4131]

i guess im asking randomly but does someone know a method to log back into an instagram account?? I somehow forgot the login password. I love any assistance you can offer me.

[@elliottdaxton7930]

@Boone Matias Instablaster =)

[@ultimateworkshop2000]

Good job, one of the best assemblies I have seen for modules of electronic load, this simplifies it a lot for noobs, but the code is missing some features to complete a prefect job: 1- Set end condition i.e. voltage in order not to destroy and deplete batteries under test. 2- Total capacity in mA or A for batteries testing. 3- Total consumed power. 👍

[@lexander9686]

17:05 i like the fact that it's only V1.0, so there is still a chance of development.

[@keithking1985]

love how alot of the way you get your readings are like how you do it in your DIY multi-meter..

[@ELECTRONOOBS]

Yes, is kind of the same sometimes

[@hemantbabel4279]

Man you are my favourite ❤️❤️ you come up with something unique everytime.

[@Catstorm99]

Perfect timing...I was looking for one until I saw how much they were. Might build my own now. Thanks for your content.

[@mik310s]

I just finished this curcuit it works great, thank you kindly electronoobs :)

[@ahmadmaaz2566]

As always, the bestest video ever.... Can't describe in words how much i was waiting for this video...awesome work dude

[@Mangomesh]

I love it. Your videos are very inspiring. thanks again!

[@keithfetterly4111]

As always, outstanding! Keep up your amazing work.

[@ELECTRONOOBS]

Thank you!

[@LitesLAB]

Excellent project! Very useful in a lot of cases!

[@alexe7376]

I did the similar project 2 years ago. I used INA219 as a current sensor together with 0.1Ohm sense resistor. It more accurate than ACS712, has I2C interface and 0.1 resistor produces less heat.

[@electronic7979]

Excellent project 👍

[@AngeEinstein]

I'm glad you exist since I definitely can't afford commercial versions of this

[@lexander9686]

Great, im gonna collect the components tomorrow. Thanks

[@Circuitoptimize23]

One of the best Arduino project. Thank u for sharing...

[@Atif_gammer]

Very nice project. Thank you sir.

[@Guru_369]

Awesome video as usual 💪🏽

[@ELECTRONOOBS]

Thank you very much!

[@harikamalakarreddydarapu7410]

You are awesome and always your projects are brilliant

[@ELECTRONOOBS]

Thank you very much!

[@checkm8606]

Looks great! Next semester I will start to study electrical engineering:D

[@ELECTRONOOBS]

Welcome to this world. Good luck :)

[@edindelic4841]

Have you checked stability of the system? Especially op Amp driving a mosfet tends to oscillate under some circumstances. Adding some caps in the right position could increase your phase margin of your system.

[@user-gw1pj7fh7q]

Спасибо большое что делитесь своими опытами 👍

[@mubbashirshirazi3758]

very very great project i made the previous version of this projet and and iam willing to upgrade it

[@sameerUNO10100]

Dope video mate

[@EasyOne]

Nicely done

[@gizmoguyar]

This is a sweet project. My only concern is that of response speed. It's probably not a big deal for the vast majority of use cases, but I could see some situations where an input voltage changes rapidly. That could cause a large current surge that could brown out the supply, or cause strange oscillations. For example, in constant power mode, if a supply rapidly switched from low to high current, this load may not be able to increase the resistance fast enough, overloading the supply. Or in constant resistance mode, a reduction to half the voltage will momentarily continue drawing the same current (half the resistance). I think this type of situation is rather unlikely. But it should definitely be kept in mind.

[@dominikworkshop6007]

This problem was a deal-breaker which stopped me from using this design.

[@desmondhow343]

It's so cool I try to make one for myself. Good video.

[@ELECTRONOOBS]

Thank you. I hope you will make It!

[@pinoyenginerd1091]

Nice , i will also use this idea for my project.

[@walidebdelli1046]

Very good, thank you for the video

[@neerajchhajed]

Amazing explanation

[@leslie1764]

I love how they say get your PCB for $2 and don't say plus the shipping 🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️

[@raagamparmar179]

yeah....LOL! It sums up to the same price....slightly lower than others.....

[@MarterElectronics]

Shipping can be low as 5 dollars or 20 dollars. It's better than first having to pay 170 dollars for a 4 layer pcb and then 22 dollar shipping.

[@ranganatennakoon]

nice project i love it

[@ninadtaralekar]

It's really nice device and the packaging has made it really professional look

[@Zloy_nub]

11:05 , don't put mosfets in linear mode in parallel , drain-to-source resistance changes as mosfet heats up, but they'll not heat up equally even if they're mounted on the same heatsink, you'll get cycle like this until one of the mosfets burns : higher temp => lower resistance => more current = even higher mosfet temperature, so eventually current rated for all mosfets will pass only thru one mosfet you can put them in "parallel" if you read the amperage, and control their gate voltage separately but anyways, cool project :)

[@widjisantoso3074]

Error = setvalue-actual Pwm = pwm+ error I just use this for the pwm compensation and it's work very well and very stable

[@neerajhebbar7313]

Your Videos are love 🥰

[@mehdik348]

Useful for me thanks you

[@homoevolutus]

Can't wait to build one! Sometimes it's best to order the parts right away before watching the whole video and deciding a project is too complicated. Not this time!! Also, XD @5:56

[@lexander9686]

Thanks for the advice.

[@Lifeofdiy2020]

Great video

[@atec9228]

Sería estupendo un diseño en PCB en vez de tanto cable y placa de prototipos. Magnifico video.

[@widjisantoso3074]

Did you read my mind? I just looking for this stuff 👍🏿

[@victoriaemily6554]

You are the best for me.

[@Happiness50057]

pls add battery capacity tester feature

[@anonymoususer900]

It's awesome broooooo

[@aurthorthing7403]

Oh heck, I missed the other one you built. I think I can handle building that first one. Thank you.

[@JakeJoris]

Made it, works great. The only issue was that the current was stuck at -500ma, but I resolved the issue by flipping L- and L+ around.

[@jdev999]

On mine the current showed a negative value, also had to swop L+ and L-

[@ATLaboratory]

Very very nice the all project! Also the case and the menu:) but I'm not sure the MOSFET is properly driven by the DAC. You should use an OP-AMP stage. I know it is not that easier to get also resistance and costant power!

[@siddharthmali5841]

Excellent.

[@dominikworkshop6007]

This electronic load is cool, I like it! I wanted to build a very similar load and because I had some problems I didn't do it, but now that I've seen this video I plan do start building it, finaly :) But I would add more power MOSFETs to share the load, because MOSFETs with great SOA (safe operating area) are expensive, and if you choose a MOSFET that isn't designed to work in it's saturation region (where it dissipates a lot of power) it might damage over time.

[@ELECTRONOOBS]

Nice. Let us know how your project is going! Keep up!

[@dominikworkshop6007]

Update: I finally built my load and recorded a video about it on my channel. I know it took a while, but I made sure to resolve all common problems found in most DIY designs.

[@atec9228]

Me gusto mucho este proyecto, vas a compartir los ficheros para poder hacer la pcb y modificarlos?? Gracias por este y otros proyectos tan interesantes. Un saludo.

[@DPTech_workroom]

I need one!!! And I will be do it someday.

[@ahmedsoliman4209]

I would suggest to start using the STM32 breakout boards for your projects, since the Arduino nano and uno limits clearly start to show up for advanced ones like this one, and it makes you take more time and waste more money on fixing them while you can foucs that on the project making it better, I but really did enjoy watching that build, it was quite the improvement form the last one and more unique not just a circuit that you found on the internet and copied.

[@anunyvape7808]

You are the best

[@lezbriddon]

1ohm is maybe a little high (voltage drop to connected equipment) simple suggestion for a bigger/better monster v2..... mosfet x3 to share the heat 0.1ohm (10x1ohm parallel less heat/less value drift so more accuracy) tl072/358/741 opamp to multiply small currents before adc (switchable? 1x 10x etc) less ugly display option, small but pretty oled ones are like $8 sdcard logging......

[@cwbh10]

Also, I think running MOSFETs in parallel as suggested by running them in the linear region could be non-ideal since the different manufacturing tolerances would make them difficult to control in unison

[@fellpower]

U can fix that very easy by splitting the gate voltage to extra OP Amps - and get that "Gate Voltage" from the MCP splitted to them. Every FET needs his own Shunt - and all is fine

[@elektrocat8681]

Can you make a tutorial about how to make an audio power meter? It should be a pretty similar project but with AC instead of DC. You make awesome videos :D

[@mhzxtal6665]

I am your pateroner, very happy to see this kind of project. It is very useful and you have fully utilized the microcontroller using a good example and best coding way to produce the user friendly features. I love it !!!!! I am your fan haha. Previously, I asked you question and you was responsive to answer my question on pateron chat. I was doing the smart watch project the latest version. But I realized that using the ATmega328-MU the footprint is difficult to solder, I try many best way to solder this and apply the flux to ensure solder paste can properly isolate and solder tightly. I keep trying more than 6 times to program the MCU but stii failed. I read many videos how you burn the code in a blank chip. But I am going to re draw the PCB and change it to ATmega328-AU, i guess using the larger size of ATMEGA328-AU then I can only successfully. Anyway, I really like your project so far. Hope you keep on post more, stay healthy and safe during this period. God bless you.

[@ELECTRONOOBS]

Thank you very much. For the small chip, do you have a hot air gun? Using a lot of flux it shouldn't be that difficult. And yes, the au version is a bit easier to solder because you can see the pins. Keep up!

[@mhzxtal6665]

@@ELECTRONOOBS yes, i used heat gun. I properly to solder and apply the flux to ensure the isolation for each pins. I am not sure why still failed to download the code. I also follow the several video to burn the bootloader. Nevermind, i will keep trying out and let you know once i success to make it.

[@TheJay6621]

Banana got his terminals. hahahah Nice work.

[@AlexKite68]

Great!

[@lucianungurean]

Great project I already made your project . Also some minor modifications . I saw that it couldn't get to higher currents due to the 1 Ohm resistor . basically your dropping way too much power on the resistor . I put a 0.5 ohms and arrived at 4 Amps with Just 1 Mosfet . the Idea is to ad a standard Shunt so all the power can be dissipated on the mosfets . I already made a 400Watt DC Load using the same ADC and DAC with adruino with1% accuracy . but my problem is that i could never understand how to make a Menu . I'm hopping that I could use your Code and modify it so id have a more extended functions . Beautiful Project

[@makkam7575]

Amazing video as always and nice job on the exterior but at 8:49 it's not 0 to 4096 as in the case of the arduino it's 0 to 255 not 256.

[@sasazenny1750]

thats a great project hope you build a li ion balance charger and discharger its already quite similar to this project

[@volkerraum3494]

Hi, nice Project, I just stumbled about one thing. GND of Sense is directly connected to the common Ground.In case you connect Sense GND and Input GND directly to your power source then the sense GND wire will also have to carry a lot of Amps resulting in Voltage drop over the wire? => Depending on the "thinkness" of the Sense GND wire, the measurement might be impacted less or more. Shouldn't Sense be measured in a differential manner?

[@AndreasA.S.]

you should really look into ferrules for things like the mosfets, solder on a hotpoint, ripe for failure

[@oktemee]

Good job! I have a question though. With the analog version there was an op-amp at the input of the FET in a feedback configuration. This time the DAC drives the FET directly without any feedback configuration. How do you know the FET drive voltage for a specific amount of current. Is there a digital feedback control?

[@circuitdesolator]

Next version could be voice controlled. Add some mic with tinyML on MCU and say the command "Set CC at 1A" 😁 Awesome work. Keep it up 👍🏼😊

[@fabiomatys]

Very nice project... In the next version you can implement one PID controller...

[@DIYwithBatteries]

That was a nice circuit Dude! 😍 Might be useful for a capacity test for 18650's.

[@ELECTRONOOBS]

Thank you. They should be interesting to test

[@DIYwithBatteries]

@@ELECTRONOOBS Yup! 🤟

[@lexander9686]

@@DIYwithBatteries you have a cool channel too.

[@RK-dp9fe]

I was thinking the same think. If yoy can make it count the mAh, time and ad a cut of voltage it will be great for 18650.

[@mar24n35]

Hi. Great tutoral and i had replicate one using the schematc all work greatl, but if i setup my power source to Give i.g 5 amp a setup the load for 2 amp or something , is drain8ng always max 1.2 amp. From 0 to 1.2 amp setup on the load all works great but any think over is always showing 1.2 amp drain. Is that mofset averhited or something alse? Thx

[@Omesh.K]

Nice...

[@jaroserafin9606]

Very nice work. Any possibility to run this device in higher load?

[@danwattaliyanagekalanaprem724]

Great video....if you can do a video on switch mode supply and its theory..(how to make a smps at home)that would be great

[@jrausa1]

Hi- Thanks for posting this. I’d like to build it, but I have one question. The link you provided for the fan looks nothing like what you actually used. Do I need to get a heat sink and fan separately, or are they available as one unit? Can you provide additional links if necessary? Thanks again.

[@NiHaoMike64]

When drilling into a heatsink with heatpipes, make sure not to hit the pipes or the refrigerant will escape and the heatpipe won't work. (If you noticed a hiss and a funny smell when you were drilling it, that's what it was.)

[@ELECTRONOOBS]

You're right but in this case, this old cooler was not filled with refrigerant. It's just filled copper tube.

[@abzaman77]

A Watt-hour counter and an automatic voltage cutoff feature would make this perfect I believe.

[@nishantwadkar6675]

Hii, I enjoy n used many of your project for diy. Can you show how to build 4 to 20 ma source with lcd indicator. Digital or analog. Need to simulate sensor values.

[@mubbashirshirazi3758]

hey electronoobs it would be a good idea if this project can be used to test the capacity of 18650 batteries by measuring how much current it delivered for a certain time and than display results in the end please please make another version with this improvement

[@machmanish1]

this is a great project. I want to know, how you made variable resistor for resistor mode?

[@jazekerxx7535]

hi, nice project. i built the previous version too. the only thing i don't like is the resistor because of the voltagedrop, so thanks for the alternative component ACS712. why don't you use a opamp to raise the voltage of the ACS712? i want to use this for building a power supply from an ATX PC PSU. i only have one lab bench power supply and sometimes need more voltages so this will be my second power supply. it wil have 5 dedicated voltages (3,3 / 5 / 12 / -5 / -12 ) with adjustable max current (for the positive voltages), and a voltage and current controlled output. all with volt and ampere meters. and at the bottom some usb connections for charging. if anyone interested in this, i made the frontpanel in tinkercad (search for ATX PSU Bench power supply)

[@PortraitArtPhoto123]

What would be the best way to build this for higher loads? I have 30ah 12s 50v lipo batteries I need to discharge after to work to storage voltage. So that like's 1500 watts at 1C. Some have said driving multiple MOSFETs could be problematic. Would it be more efficient if that actually fed a bank of high-power resistors?

[@BeetleJuice1980]

Great, can you add mAh to the code to measure capacity?

[@giulianoLP2505]

Question: Why not a INA family current-shunt monitor?

[@atec9228]

También sería interesante que subieras el propio fichero easyeda para poder hacer el pcb. Un saludo.

[@RMquickbit]

Can you simply parallel the mosfets without any other modifications?

[@sajidmohammad3190]

I wanna make the Fan Temperature Controlled...At which 🌡 the fan should turn on and at which 🌡 the fan should run at full speed?

[@isaacsimon6863]

Awesome! This is really cool! in V2 can you make a PCB? maybe smaller too? I would love to have one on my desk! also, I've become a very frequent commenter. if you remember me, I'm sorry for causing so much trouble with all these questions! I love your youtube channel and you are one of my favorite KZbinrs along with GREAT SCOTT! I love you guys and I REALLY think that you guys should meet each other and you guys could have some AWESOME ideas. A collab would be AWESOME!!!!

[@ELECTRONOOBS]

Sure! I have a PCB design but is not ready yet!

[@RexMods]

Is it possible to have higher gain, say with R7=2kohm, R6=2kohm? What is the maximum voltage for the MOSFET, the Vgs in the datasheet? So 20V? Thanks!

[@1996misterio]

Ostias colega ... lo haces mas grande y no te cabe en casa, podría ocupar una cuarta parte de lo que te ha ocupado a ti jajaja

[@prussian7]

I was going to make an old fashioned resistor box. But after watching this I am re-thinking that.

[@adeshkumar5534]

is there any voltage limiting factor here? actually i wanted to test my lithium ion cell using this...will it work for such low voltage of 3V?

[@Guru_369]

Bro need more video related to power electronics...

[@atec9228]

Hola, el esquemático cuando lo descargo luego no se ve bien. Podrías subirlo en Google Drive o algo así para poder imprimirlo y así montar mi unidad de carga electronica. Gracias

[@protonspeed]

Can i use AUTOPID library to create constant close loop system ??

[@umer6069]

Which gauge of wire did you use to connect to the mosfet.

[@franzhagemuller6413]

Maybe you should consider calibrating your oscilloscope probe... Otherwise great video!

[@RicardoPenders]

You can increase the accuracy of the Arduino from 8 bit to 10 bit for the PWM output and to measure more accurate you can increase the analog input from 10 bit to 12 bit

[@protonspeed]

To increase the accuracy can we use 16bit pwm output??

[@RicardoPenders]

@@protonspeed nope, on arduino 12 bit is the absolute highest you can go, of course you can use another chip that does the conversion in 16 bit and then communicates it back to the arduino via serial communication.

[@protonspeed]

@@RicardoPenders Arduino uno does have 16bit Timer, it's called Timer 1,so it's possible to generate 16bit PWM by Arduino it self. Isn't it ?🙂

[@RicardoPenders]

@@protonspeed not sure about that, I thought it was 12 bit tops

[@protonspeed]

@@RicardoPenders Nah, I've been using 16bit pwm for my project.😊

[@relaxingelectronicmusic775]

like cool..

[@muhammadshahzaib3813]

add battery capacity measuring feature it can be hard since cc-mode is already there.

[@jdelectron]

can we integrate with lion battery capacity tester

[@tonysfun]

Thanks for your videos! How soon are you gonna have the updated version?

[@ELECTRONOOBS]

Not sure...

[@tonysfun]

@@ELECTRONOOBS I like to make one, but I don't want to shortly after that start fixing it.... I'll hold on until I buy pro version, that can be as soon as August, than I'm not gonna make it at all.