LED Wrist Watch

DIY digital wristwatch

August 2014

Small! 4x3 cm
ATmega328 microcontroller
Two (2) LR44 batteries
HP QDSP-6064 LED bubble display
Microchip MCP7940M RTC
Program time mode

With nylon and velcro band

Crispy red LED display

Point-to-point wiring on perfboard

Limitations

To save battery life, time is displayed only when button is pressed down
Display is not bright enough to be viewable in sunlight