I bought two of these chargers on the internet because my phone has trouble with charging via micro usb. The charger works great; when you put the phone on the coil a blue LED on the PCB will light up and then the phone will say it's charging.
My issue is that if I leave the phone on there all night it will over-charge it and eventually the battery will go bad. (I had to replace the battery once.)
What I want to be able to do is put the phone on the pad, fall asleep, and then in the middle of the night I want for it to turn itself off when the phone is at 100% charge.
What I don't know is how to have the charger begin to detect if the phone is charged and to stop trying to charge the phone further. A way to do it might be to write an android application for the phone which sends a bluetooth signal indicating 100% charge and then having an Arduino get that signal and deactivate the charger, but that seems really complicated. I feel like there is probably a simpler way.
Do y'all have any ideas or am I completely nuts?