I bought an USB Arduino and develop some code with USB interface.
I use in my program Serial command.
It work nice, however through the USB interface.
When I connect PIN TX and RX directly to a rs232, with Arduino alimented via an external power and without USB connection, the COM port receive strange characters. I have tried all the baud rates… whatever, it should be the same than with USB interface.
So, what’s the problem?
Serial.println( “hello” );
Nothing special!!! Have a clue???
Best regards… Pierre :o