That doesn't work, pin 3 just needs pulling low to turn on the RF LED on the front panel of the Tx (a 1k resistor works fine).For example, OpenLRS controls pin3 via Arduino and code.I can use a 10k pullup resistor between pin1 (PPM) and pin2 (Tx battery voltage) and get around 10v PPM - waaay too much!I think I'll try a pullup resistor between PPM and the 3.3v onboard regulator of my ghetto module.Any other ideas? (other than using the trainer port, which is not an option for module useage).Nigel.
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