Arduino tomato timer with LED
- 3 pieces of wire
- Arduino
- 4-digit display (for example, CATALEX)
- Display CLK to Arduino digital PIN 13
- Display DIO to Arduino digital PIN 12
- Display VCC to Arduno V5
- Display GND to Arduino GND
- https://github.com/bremme/arduino-tm1637 to interact with the 4-digit display.