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Today I tried to upgrade to the latest firmware version. Unfortunately, that did not help, so I think the digital input representing the trainer port has been damaged. I probably have to replace the board or the entire radio.... Polarity of pulses: The Arduino Nano is operated from a 4V Li-Ion...

Thank you for taking your time to comment! I connected a DX6i as SLAVE to my DX8 as MASTER with a 3.5mm jack cable, and "sniffed" the tip of the jack with an oscilloscope while in trainer mode. The signal was normally high (around +1.6V) and the pulses in the PWM-sequence were -2V, i.e. a...

Hi Tony, Thank you for your proposals! :) I measured the voltage on a DX6i used as trainer to learn about the trainer signal, and the pulses were around 3.5V, so I hoped that 4.0V would work. Now I regret that I did not take it down to a lower level.....

I have made a "Tilt and Roll Trainer Slave" by an Arduino NANO board and an accelerometer. It is plugged into the trainer port of my DX8 and is supposed to manipulate elevator and aileron by tilting this device a few degrees in tilt and roll directions respectively. The plan is to be able to...