I’m building a solar charger. Right now I have:
- Battery shield with a Photon (most of the time sleeping)
- 3.7V battery connected to the LiPo connector
- Solar panel connected to the VIN and GND pins
Now I want to charge an external device (5V), like a mobile phone. For this, I’m using a PowerBoost (Adafruit):
The PowerBoost is connected to VIN and GND pins. The idea is to convert the ~3.7V from VIN (battery powered) into 5V.
Here’s my diagram: