Accurately Read Battery Voltage with an Arduino and Voltage Divider | Pro Mini | 18650 | ATmega328p

Lets look at how to track Arduino VCC and accurately measure battery voltage using a voltage divider.
Hope you learn something new. cheers!!!
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[@Magne-ficent]

How are you getting vcc max value of 3.303 volts? Is that max voltage through the voltage divider?

[@khaleef_hrm]

Hello. Can i connect with you please. I just started learning Arduino and I'm all about 18650 battery. I want to do a lot with Arduino with 18650. If you don't mind.

[@Delali]

Please check the about page of this channel for my email.

[@andresmateo4281]

Excuse me one question, why you didnt use the function "map" to get the battery percentage?

[@jakesllama]

It doesn't work I tried the same and couldn't find answer why online. So went to basics and divided the value against the total times 100. This worked for me atleast

[@Delali]

I didnt use the map() function becuase there was no need for making the Atmega328p do more work. I wanted to keep the code simple. I believe this: ((batt_volt - lowBat )/ (fullBat - lowBat)) * 100 is simpler than this: map(batt_volt - lowBat, batt_volt - lowBat, fullBat - lowBat, 0, 100)

[@iamfyrus]

Can I measure without DC power supply? Anyone done it with nano 5v?

[@Delali]

Yes you can. The battery will be the power source and the entity being measured at the same time. Unless i've misunderstood your question.

[@woll757]

You powered the pro mini with more than 3.3v in the beginning, but with a current limit. Is this why it didn’t break? Or Why is it ok to power 3.3v pro mini with ~4V? Great channel and vids btw keep it up!

[@Delali]

I powered the pro mini with a current limit to ensure it doesnt get damaged incase i dont something wrong along the process of making the video. It was just a safety precaution. Thanks for the kind words too. I appreciate your feedback. Cheers!!

[@aherte1257]

assuming battery level with just measuring the voltage is not a very correct approach. Because voltage discharge level is not linear. to calculate the exact power level you also have to measure the current.

[@Delali]

In my case i'm just trying to measure the battery voltage, so the non linearity of battery discharge doesnt matter much. It might matter if i was trying to calculate and estimate how long before the battery gets to a fully discharged state. I hope you get what i mean.

[@sivaforu2004]

How about the same for esp32? i'm unable to use the program for esp32?

[@Delali]

The code is meant for the Arduino line of boards. I belive the ESP has a different architecture.

[@samithetechsavvy6485]

Thank you very much

[@Delali]

You are welcome. Please don't forget to subscribe. Cheers!!

[@samithetechsavvy6485]

@@Delali of course, already done , keep up

[@tybozo]

question: would this problem exist if you used a separate power source for the arduino and not use the battery?

[@Delali]

No it wont exist. If the power source never dips below the 3.3v output peg the microcontroller requires as reference then this problem goes away.

[@gloriagbagbo-pf1of]

This is a beautiful channel

[@Delali]

Thanks fam.

[@autonoob]

Is this still a problem if you use two cells feeding a voltage regulator that then feeds the arduino? As I understand it the problem arises because a Lion cell drops below 3.3V as it discharges this messing with the analog ref. Correct?

[@Delali]

Yes. Correct. If you use two cells in series, the good news is you have more time before the combined voltage dips below the voltage regulators desired input.

[@robotboy3525]

Mad respects brother! mad respects!

[@Delali]

Thank you fam❤️ Please dont forget to subscribe. Cheers!!