Freematics Forum

Hi Stanley,

I have connected the OBDII uart v 1.2 to a VW golf from 2008.
I'm using an Arduino MEGA ADK on Serial 2 since all the other ports are already used.
I modified the OBD.h file line OBDUART Serial2 instead of Serial.

I get correct readings (RPM, speed, coolant temp). I don't get anything ...

Thank you Stanley,

SO If I got it right, I should connect the OBD adapter Red wire to the regular 5V (out) pin of the MEGA ?
I 've read that the adapter could provide power to the Arduino.
In this case, I'd need to connect the OBD adapter red wire to the VIN pin of the MEGA?
Doing so, means it is ...

Hi All,
I got a OSBII UART adaptor. it comes with the following cables:
Blue
Yellow
Red
Green
Based on pics I found on the website I'm assuming that
Blue is Rx (wired to Arduino’s serial Tx)
Yellow is Tx (wired to Arduino’s serial Rx)
Green should be Ground
RED should be Power

Question 1: is ...