Oh the melexis... I had the heat up issue when powering from both USB and the 12v car supply. I snipped the 5v power from the USB line and that allowed me to se

Oh the melexis... I had the heat up issue when powering from both USB and the 12v car supply. I snipped the 5v power from the USB line and that allowed me to serial into the teensy and read data. Iirc the melexis supplys 5v from one of it's pins.