[WhiskeyTangoHotel] wrote in with his newest clock build — and he did warn us that it was minimalist and maybe less than useful. Indeed, it is nothing more than a super-cheap ESP32-C3 breakout board ...

First we want to generate the 134.2kHz carrier frequency for the reader. We can do that by using any of the Arduino's PWM-capable timers to generate a square wave. Arduino timers can only achieve a ...