Paul McCabe| Quantity | Component name | |
| 1 | × | 1 each -Arduino UNO |
| 1 | × | 1 each - 4 Digit 7 Segment Display SMA420564 |
| 1 | × | 1 each - UltraSonic Sensor HC-SR04 |
| 1 | × | 4 each - 220 Ohm resistor |
| 1 | × | USB Battery |
No Touch Hand Washing Countdown Timer
A simple 20 second no touch countdown timer using and Arduino UNO, an HC-SR04 Ultrasonic sensor and a 7 segment display.