ExpressLRS: mal eben schnell ein ELRS-Sendemodul

One of the simplest ways to build an ELRS transmitter module (without a backpack) is to use an ESP32/ESP32C3-based PWM receiver. This receiver already has the necessary voltage regulator built in and can also detect CRSF half-duplex (with any polarity). It couldn't be simpler, especially if the appropriate cable is already included (Radiomaster ER6 / ER8, ...).