Original source: https://create.arduino.cc/projecthub/CesarSound/10khz-to-225mhz-vfo-rf-generator-with-si5351-version-2-bfa619?ref=user&ref_id=1465945&offset=1 10kHz ...
This project generates a square wave signal using Timer1 on an Arduino. The frequency of the square wave can be adjusted via serial input, making it a versatile tool for signal generation and testing.