arduino pro micro + a 3.7v lipo

Using Arduino Motors, Mechanics, Power and CNC
1

I've been looking for a dc-dc converter that would turn my 3.7v lithium polymer battery into 5v and wouldn't let the battery drain so much it couldn't charge anymore, but so far I've just found modules that convert the voltage. Anyone know any cost effective places where I could get a reliable charger? I'm planning on using it with a cheap 5v arduino pro micro from china if that helps

2

If you don't need 5V, you don't need the stepup converter.

The ATmega32u4 will run directly off the battery, indeed on as little as 2.7 V. You can also check the battery voltage directly using the ADC.

3

You can also add LiPo Fuel Guage from Sparkfun to track how discharged the battery is getting.

4

thanks crossRoads but from what I'm getting is that it would only tell me but not cut off the power?

5

if so I think I could still work with that

6

Pololu.com I think has a switch that can do that, uC can tell it to turn off when it sensed power was at the lowest point you wanted to let it get to.

7

mmmh ok then. The LiPo Fuel Guage from Sparkfun seems like the best choice then :slight_smile: . Thanks for the help