Raspberry Pi Pico as AM Radio Transmitter
2 days ago
- #AM Radio
- #Raspberry Pi Pico
- #PIO
- Raspberry Pi can accidentally function as an FM radio transmitter using a GPIO pin and a jumper wire as an antenna.
- Raspberry Pi Pico, lacking the same architecture as regular Pi boards, uses PIO to generate square waves at half the system clock rate.
- Pico boards can be overclocked to ~200 MHz but cannot precisely control frequency, ruling out clean FM transmission.
- Pico can better control lower frequencies suitable for AM radio (~1000 KHz) using On-Off Keying for simple audio emission.
- A PIO program generates a 1000 KHz square wave, and the main program modulates it to emit specific audio frequencies, like the 'Shave and A Haircut' melody.