Use Zetta

[lukeorland]

• create a roller device that controls red and green LEDs and has a ticks counter
• connect hall effect sensor to roller device
• create a raceMonitor state machine that:
  • handles "start-counting" transition
    • turns red LEDs green
    • resets ticks counter to 0
  • handles "stop-counting" transition
    • ignore magnet
    • turns green LEDs red
• hook up all 4 rollers to the raceMonitor
• npm package
• publish to npm