WiFi and LoRa both handle data, not audio (Morse code). Although, you could make a Pico data transmitter and another Pico to receive and convert to Morse code. But "easy"?There are ISM band radios that don't require a license. They are low power and short range. They include WiFi & LoRa (long-ish range compared to WiFi).
433MHz is popular for wireless keyfobs.
At least in the UK (and probably Europe), ISM band needs type-approved equipment, so you would have to buy a pair of transmitter and receiver, and connect them to the Pico (TX), probably just audio stuff for RX. You would also have to find a pair that handle audio rather than data. It depends on your definition of "easy".
Statistics: Posted by davidcoton — Wed Jan 22, 2025 10:58 pm