Hi I'm having a Arduino Mega that i want to communicate to via the usb. But whenever i send any data to the arduino, it crashes! (the loop stops)
For example if i take the standard blink sketch and run it, it works fine. Sending data from the serial monitor doesn't influence the sketch. But if I add a Serial.begin(9600) in the setup, and nothing else, and send a byte to the arduino, the blinking stops.
The RX led blinks fine when i send it data
I'm running Arduiono IDE 22 on Mac OSX Lion. Any ideas whats going on? Is it a broken board?