OBD2 to MQTT for Home Assistant

What you need?

• an installed Home Assistant with Mosquitto Broker
• (optional) an installed PlatformIO
• (optional) an installed NodeJS and NPM
• a ESP32 with SIM800L or A7670
  • (optional) RP-SMA to IPX cable
  • (optional) Antenna (work's for me) or other
  • (optional) a 3D Printer for the case
• a ELM327 OBD Bluetooth Adapter or any other
• a SIM Card - i use one from fraenk
• and the most important thing, a car

Getting started

Upload via Web Installer (ESP Web Tools)

If you don't want to install PlatformIO and compile by your own, use the Web Installer.

Update Settings or Firmware & Filesystem

• connect to WiFi Access Point starts with name OBD2-MQTT- followed from device MAC
• open Browser and navigate to http://192.168.4.1
• change settings to your needs and reboot afterward OR update to new firmware and filesystem

Build

Build firmware.bin

pio run [-e OPTIONAL ENV]

Build littlefs.bin

pio run --target buildfs [-e OPTIONAL ENV]

Upload

Build and upload firmware.bin to device

pio run --target upload -e T-Call-A7670X-V1-0

Build and upload littlefs.bin to device

# connect to AP and save current settings
curl http://192.168.4.1/api/settings -o settings.json

pio run --target uploadfs -e T-Call-A7670X-V1-0

# after reboot connect to AP
curl -X PUT -H "Content-Type: application/json" -d @settings.json http://192.168.4.1/api/settings

Supported Sensors

This sensors only available if your car support.

• Ambient Temperature
• Battery Voltage
• Calculated average speed
• Calculated consumption
• Calculated consumption per 100km or MPG
• Calculated driven distance
• Check Engine Light
• Engine Coolant Temperature
• Engine Load
• Engine Running
• Fuel Level
• Fuel Rate
• Intake Air Temperature
• Kilometer per Hour
• Mass Air Flow
• Oil Temperature
• Pedal Position
• Rounds per minute
• Throttle
• Top Speed ;-)

Diagnostic Output:

• CPU Temperature (ESP)
• Free Memory (ESP)
• GPS Location (only for A76xx)
• GSM Location
• Signal Quality
• Uptime

If you are afraid of the Internet...

...and don't want to expose your MQTT broker on the Internet, use a free MQTT provider and take a look on mqtt-proxy tool.

ToDos

• support more PIDs (odometer,...)
• get vehicle information (working)