- 1x Particle Photon: ~$20
- 1x Raspberry Pi: ~$25
- I used a version 1 Model B
- >1x Hall effect sensors: ~$5
- I bought ten and accidentally broke one
- Consider also: alternate form factors
- ~10x 470 Ohm resistors: ~$5
- My circuit only uses two or three, but I bought a pack of various resistors for experimentation and future usage
- LEDs: ~$10
- Testing and development, it's also nice to have a few in the final product