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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
  • 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

Info Settings1 Settings2 OTA Updater

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

Sensors1 Sensors2

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.