OBD-2 Testing Update

I finished testing the OBD-II adaptor board this week on a Toyota Camry. As you can see in the picture the board had a few bad connections, but nothing that couldn’t be fixed with a few jumpers.

I was able to get a number of stats from the free Torque Android app like
  • Throttle position
  • Engine PSI
  • Collant temperature
  • Engine Load
  • A number of Diagnostic Trouble Codes
  • O2 sensor voltage
  • Revs
One interesting note I learned was the evaporative system test reported as incomplete, which Toyota supposedly repaired during my last visit!
Next up, test the remaining OBD-II protocols and bluetooth range. Expect a new revision in a few weeks.


  1. Timothy D Legg April 21, 2023 at 7:34 pm

    Very nice! I was looking for this site. I bought a similar device online a few years back which may be a clone or derivative of your project and it does work very well with the Torque app on Android.

    I have very little experience with Bluetooth (and have a long history of being troubled with it, such as my laptop pairing my phone as an external speaker when I want to transfer files, or being able to only write, but not read a file) I am interested in building an LCD based dashboard that scans data from the Bluetooth channel. There seems to be a number of Bluetooth-to-serial- adapters in the hobbyist arena. Would one of these suffice to communicate similarly as Torque would, or would I need as lower-level approach and compile in Bluetooth-specific libraries?

    I have not found a schematic viewer that will open the obd.sch file without error, so I don’t know which Bluetooth device you implemented.



    1. I used one of those Bluetooth serial modules. Just connect it to the UART of your microcontroller and you have a serial interface over Bluetooth. I don’t know the exact one, but it was similar to this https://www.olimex.com/Products/Components/RF/BLUETOOTH-SERIAL-HC-06/



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