Micro MinimOSD – D4R-II RSSI using RC Filter
I’m running a Flip32+ using a D4R-II receiver and wanted to get RSSI into the Micro MinimOSD. Googling yielded other results that did not work for me. After digging deeper, I found this worked for my set-up. The solution is an analog RC filter consisting of a cap and few resistors. The idea is to convert the PWM signal to an analog signal so it can be interpreted correctly. Analog will provide an analog signal of varying voltage levels and then tune the RSSI settings in MWOSD GUI.
- Turnigy 9X v2 with ER9x
- FrSky D4R-II receiver
- Micro MinimOSD
- Cleanflight 1.8.1
There are varying suggestions on which resistor / cap combinations to use. In my case, I’ve got a 10K, 1K resistor, and a 10uF Cap. I believe these values can be lower, and simply affects what settings are used for Min/Max/Alarm RSSI values in the GUI. The below pictures show the circuit layout and the end product. The pin to the left goes to Pin 2 of the D4R-II (you need to use PPM). Then the other 2 go to the RSSI pin and GND on the Micro MinimOSD.