Johan Beyers| Quantity | Component name | |
| 1 | × | Arduino |
| 1 | × | Cut Veroboard |
| 1 | × | multipin headers |
| 5 | × | LED (5mm through-hole) |
| 5 | × | 220 ohm resistor |
Dog Speedometer
I built a Persistence of Vision speed indicator for my dog, using an Arduino, a few LEDs and resistors, and less than 40 lines of code.