Electronics › Electronics › rf based speed indicator › You don’t have to transmit
May 4, 2012 at 6:28 pm #7589
You don’t have to transmit any data, so all you need is a simple single frequency rf transmitter and receiver. I think you better make a circuit yourself for tx and rx. Lot of examples are available in the net.
People normally use rf modules only when they need data to be transferred.