Freematics Forum

Any suggestions?

We still have a problem with cars!
It look like HW/CAN problem...

We are useing Freematic I2C readers for remote diagnose on Fiat Ducato (CAN 29/500). Sometimes it happens that car report some warnings on driver screen. We have also a case that car did not start and it turn off the engrine on motorway(did not recognize the car key). It is possible that OBD reader ...

Problem solved!

Data and clock wire is incorrectly soldered.
white is SCL/CLK
green is SDA/DATA

Should OBD-II adapter respond on I2C slave address (0x62) with ACK if is just connected on 12V (4-5 pin GND, 16 to 12V), without car comunication?

Hi staneley. I have a similar problem. My system is not Arduino but STM32 board (3.3Vcc). 5V -> not connected ( have a 3.3V on STM32 board) GND -> connected with GND board White -> SDA (board working on GND to 3.3V level) Green-> SCL (board working on GND to 3.3V level) I2C speed is 1k to 100k. I tr...