I have been working on a Arduino D1 Mini Powered Watch. The hope is to add features like the MAX30102 for heartbeat monitoring, and an accelerometer to monitor activity. So far the time function is the only thing working in the software.
This is the preliminary schematic diagram:
This is the bottom of the circuit board. The DS1307 is glued on. The yellow headers are for the D1 Mini. The top connector is for the SSD1306 and the bottom connector is for the MAX30102.
This is the top side of the circuit board. There are three switches for "up" "enter" and "down". They are tied to D6, D7, and D8
The software is on github under bobdavis321.
