Dammit, a hardware issue somewhere
To read the data i need to invert the signal from the ECU which i use this circuit for
I use this with an FTDI cable to read the stream directly and its fine. When there is data coming the LED flashes but when i connect Rx to the arduino rx pin the LED goes out. I just checked at theres 5v at the arduino rx and tx pins. Whats that all about??