- 5V/100mA Solar Panel
- Plastic Project Box
- 1F Super-Capacitor
- Atmel ATtiny85 Microcontroller
- 3.7V 1120mAh Li-Ion Camera Battery
My experience building charge controllers and switching power supplies is limited. To save time I ordered this little circuit from browndoggadgets.com:
This 3.7V Li-Ion charge control circuit accepts 5V Vin and has an integrated 5V boost supply that feeds off the battery. My hope is to modify the circuit board so that the ATtiny85 uC can turn the 5V boost supply on and off as needed.