In the January 2009 issue of Elektor we saw how straightforward it is to connect a low-cost RFM12 868 MHz ISM (licence-free) radio module to an ATmega microcontroller. Simple example listings in BASCOM demonstrated how to communicate data using the modules.
The ‘USB radio terminal’ circuit described here connects an RFM12 radio module to the R8C/13 microcontroller board used in the ‘Transistor Curve Tracer’ project described in the February 2009 issue.