A simple Arduino based longboard speedometer.
- Arduino pro mini
- 4 digit 7 segment 0.56 inch display (I used HS420561K-C30, but other 0.56" 12 pin displays should work just fine)
- TP4056 based li-ion charging circuit
- Li-Po battery
- Reed switch (Although I recommend getting a hall sensor instead)
- 2 state switch 14 x 9 mm
- Magnet
- Something to program the Arduino with
| Pin connections | |
|---|---|
| pin 2 - pin 7 | top row of the display pins |
| pin 12 - pin 17 | botton row of the display pins |
| pin 10 | sensor data |
| ACC | sensor VCC |
| GND | sensor GND |
| VCC | power + |
| GND | power - |