I finalized it I hope. My setup is now like this:
- Battery Balancer connector. Contains a voltage divider (1M/100k, reducing 11 times) and 3 wires out (GND is doubled for convenience)
- DC Stepdown buck, for supplying Sensor Arduino with 5V
- Sensor Arduino. Reads the voltage, transmits it over hardware serial at 300 baud
- Optoisolator pair, set to double inversion (Opto LED normal OFF), worked better like this. Prevents the Short due to no common ground.
- IBUS Arduino. Receives the Sensor Data on hardware Serial, transmits them to IBUS
- IBUS connector
Surprisingly, both the RC Receiver and Arduino survived the fire. Arduino on the left is the one, after cleaning fire traces and soot.
Will fetch some fresh heat shrink and iso tape tomorrow, and pack it into a small plastic box (which contained 100 pcs of 3x10 wood screws earlier), leaving only both cables out.
