Breakout board · rev 3.3.B
Standard breakout board
The through-hole breakout board you build yourself.
What it does
The breakout board sits between the machine's wiring and the Raspberry Pi. It makes the machine's 12-volt signals safe for the Pi, fuses everything, and keeps the power on after key-off so the Pi can save its data and shut down cleanly.
Every wire from the machine lands on a labelled plug that pulls off for testing, and every circuit has a status light or a test point, so a fault can be found with a meter and your eyes.
- All through-hole parts, built step by step from the Board Assembly Guide
- The analog converter and the sound amplifier (mono or stereo) plug in as ready-made modules
- Fuel sense switch: the dash alone, or keep your old fuel gauge as a backup
- Power-hold circuit: the hour meter never loses time at key-off
- A status light for every supply and switch, and a spare input for add-ons later
- 162 × 159 mm, on nine M3 mounting points
What it connects to
| Plug | Connects to |
|---|---|
| POWER IN | The battery, and the key switch's run and start terminals |
| TO BUCK | The 12 V to 5 V converter that powers the Raspberry Pi |
| TO PI | The Raspberry Pi, on a 40-way ribbon cable |
| SWITCHES | The engine oil pressure, hydraulic filter and hydraulic oil temperature switches |
| FUEL | The fuel tank sender |
| COIL | The ignition coil, for engine speed |
| TACH | An optional Hall-effect crank sensor, for engines without a coil signal |
| LIGHTS | The front, rear and work light circuits, so the dash shows what's on |
| HORN | The alarm horn |
| BUTTON POD | The five dash buttons and the pod's cooling fan |
| TEMP PROBE | Temperature probes for the electronics box and the cab |
| TILT | The TILT board (Pi 5) or the Pi 4 TILT + CLOCK board |
| AUX | The CHT + Parking Brake board |
| SPARE | A free Raspberry Pi input, for something you add later |
Daughter boards
Runs on a Raspberry Pi 4 or Raspberry Pi 5. These small boards add to it:
- Optional
CHT + Parking BrakeCylinder head temperatures and the parking brake switch
- For a Pi 5
TILTThe machine angle (roll and pitch)
- For a Pi 4
Pi 4 TILT + CLOCKThe machine angle, plus the clock a Pi 4 needs
- Optional
GPSGround speed, altitude and job sites
- Only if needed
ADS1115 adapterFits the older one-row ADS1115 converter module
The other boards
M.O.S.S. is in development and bench testing; details may change before release.