The schematic is quite simple. When i started making this watch, i didnt think that much about power saving. So i made auto-shutdown circuit, and trigger the watch on with button PA0. The schematic when turned off still remains power for BKP and RTC section in Stm32f1 chip. So that make the watch lasts really long.

Power section im using TP4056 charger IC, regulator 3.3V AP2112.

This part takes me so long to complete. Check out my github repo to fully comprehended