Freematics Forum

I noticed during testing with my UART V1 OBD adapter that when the car is on (not necessarily the engine, but key is turned to on) that my device polls the OBD quite fast. The red light on the adapter blinks constantly. However, when the car is off, the red light on the adapter will blink about once...

On the page for the I2C (or really any other) model: m scroll down to the "Comparison" section and you will see the difference. But basically... V1 is UART only and no MEMS (accelerometer). I2C is, well, an I2C interface and has a MEMS. V2 is UART *and* microUSB (so you can use it directly...

Yes, as I stated above: "Then I connected ground to Uno ground "... and I also connected the ground of my FTDI adapter to the ground on the Uno.I verified continuity between the grounds with my multimeter. Also, the only light on the adapter that comes on is the red LED and it does blink o...

I purchased an OBD-A back in September and just now got to using it. I developed my particular project initially without the OBD as there was a lot to do beyond just getting the speed and in the end, that should have only been a few lines of code. But once I tried, it just hung up on obd.init(). To ...