There’s been talk of adapting the USB Infrared Toy to transmit AM radio frequencies as well as infrared light. Today we noticed a similar project by Peter Jakab.
Peter’s DIY remote control based on PIC can emit IR or RF, depending on the output device. With an IR LED and it outputs normal remote control pulse-trains. Substitute an oscillator for the IR LED and it transmits radio frequencies.
The RF option is about the simplest type of transmitter possible. The oscillator output connects to an antenna. The microcontoller switches the oscillator on and off to encode data.
Via Hacked Gadgets, a long-time friend of Dangerous Prototypes. Alan Parekh and Ian were writers for DIY Life years ago.