I have a quadcopter with Pixhawk 2.1 a Frsky X8R receiver. RSSI output is connected to Sbus port of PH, following instructions on http://ardupilot.org/copter/docs/common-rssi-received-signal-strength-indication.html.
Arducopter parameters are configured with Analog_Pin=103 and RSSI range from 3,3V to 0,0 V.
The problem is that RXRSSI values are fixed around 50 (HUD), not ranging from 100 to 0 as expected (when I turn off the Taranis Transmitter).
This setup worked fine in my previous flight controller, a 3DR Pixhawk 1 with AC 3.4.6, but problems arrived when I upgrade the firmware (to 3.5.5) and the hardware (to PH 2.1). So I can’t find a solution to this, as I don’t know if this is a Mission Planner or an Arducopter issue.
By the way, FrSky telemetry has its own RSSI graphical values (displayed in the taranis) and alerts.
Somebody have a solution for this, please