So I am planning to use this circuit to charge a coin cell that I have powering an 3.3 volt arduino.
The circuit has a LED that is lit up while charging but since I dont plan to charge often, I wanted to reuse that LED for my actual program.
1) Can i simply connect a digital pin to that resistor led part? Or would that cause problems when I plug in the 5 volt usb power to charge?
2) What would I have to do in order to use that reuse that led? My circuit is running out of room and I need the LED in a specific place for my enclosure.