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 control my RC planes in the winter by simply tilting this device in my right hand while the hand is located in a pocket. The signal out on my 3.5mm jack looks fine on an oscilloscope, running 4V pulses as from a Trainer radio. It worked fine in the lab. for a long time, but one day my DX8 failed, and the trainer function was "confused", the plane trottle was all the sudden influenced by the aileron signal for example. I have tested a DX6 as Slave, and my DX8 is still "confused". I wonder if I have destroyed a digital input on a microcontroller in my DX8, maybe 4V (through a 1k resistor in series) was too much? Would it be possible to replace any component, or do I have to purchase a new DX8? Any advice?