So I’m just chuffed I’ve gone from hello world to libraries this morning.   Nothing complicated, but tedious. A couple of examples: #include <Morse.h> Morse morse(13,5); // pin, wpm void setup() {} void loop() { morse.send("CQ World K"); delay(5000); } And just a tiny bit more involved, serial in, morse out. #include <Morse.h> Morse morse(13,30); char letter; void setup() { Serial.begin(9600); } void...