Diagnostic Extra Serialport Over Radio Transmission (for RP2040/Raspberry Pi Pico)
Use Case: You need to view/log low-rate text from a RP2040 wirelessly, with no additional components (such as Wifi or IR transmitters)
This solution: Mis-uses one of the RP2040's internal PLL's to generate crude binary FSK in the low-VHF? band to encode a 9600 baud data stream. Includes a GNURadio?/VisualBasic? app to decode the stream on a PC after receiving the signal with a low cost SDR.
Drawbacks: Many, including that its probably illegal to create such an RF signal and send it to an antenna without filtering and licensing.
Acknowledgemnt: Tremendous thank you to Kazu for his library github.com/kaduhi/pico-fractional-pll.