user33256: 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!

user521: 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

33256: <p>I have a 5V arduino pro micro. I want to power it with a 3.7V lipo. </p>

<ul>
<li>Should I use a step up module to convert it to 5V? </li>
</ul>

<p>I also want to measure the voltage of the battery. </p>

<ul>
<li>How can I do this? </li>
</ul>

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

<p>I also use a lipo charging module to charge the battery.</p>

<p>Thanks for helping!</p>
 521: <p>You can read the Arduino's supply voltage see here <a href="https://arduino.stackexchange.com/a/50771/521">How to measure the supply voltage of Arduino without using an analog pin</a> Alternatively use the internal 1.1V reference and a suitable voltage divider to read the lipo's voltage</p>
