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I have a 5V arduino pro micro. I want to power it with a 3.7V lipo.

  • Should I use a step up module to convert it to 5V?

I also want to measure the voltage of the battery.

  • How can I do this?

Because I read that the power source also the reference voltage is so I cant measure it with an analog pin right?

I also use a lipo charging module to charge the battery.

Thanks for helping!

Robbe
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2 Answers2

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You can read the Arduino's supply voltage see here How to measure the supply voltage of Arduino without using an analog pin Alternatively use the internal 1.1V reference and a suitable voltage divider to read the lipo's voltage

Bra1n
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Yes, you should use a boost converter to convert the 3.7V from your battery to the 5V that the Arduino requires.

As I understand it, measuring voltage to determine charge level does not work well with lithium chemistry batteries since they hold a nearly constant voltage until they are almost completely depleted. Generally lithium batteries include a chip that measures current in and out and lets you query their charge level.

Duncan C
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