[quote=“erik46”]The receiver sends back two analog inputs and any other rs232 input from the model to the transmitter, On the back of the transmitter module there is a connector with the rs232 output, positive and ground. The battery pack in the transmitter is 9,6 Volts.
Thanks for the tip, I will check the voltage output from the transmitter. I found PD0 and PD1 to be the Rx and Tx.
Still no clue where to start, any links are welcome.[/quote]
I’m looking into something like this, and found some references that I’m finding helpful, maybe they’ll do you some good.
Atmel has an application note on using the UART in C at http://www.atmel.com/dyn/resources/prod_documents/doc1451.pdf
It’s pretty slim, but comes with some example code http://www.atmel.com/dyn/resources/prod_documents/avr306.zip
Also, look at the section on the Universal Serial Interface in the data sheet for the 328p