With this project you can measure a frequency from less than 1 Hz to about 6.4 MHz, with atomic clock accuracy (fclk_I_O / 2.5 according to the datasheet, which is 16 MHz / 2.5 = 6.4 MHz, but 7.5 MHz ...

The Donut Dongle connects to a switch in a way that allows it to see which port is active. When a console powers on (auto-switching) or an input is manually selected, the Donut Dongle sends a serial ...