Received Signal Strength Indication (RSSI)

This article shows how to get the Received Signal Strength Indication (RSSI) from an FrSky receiver to APM.


Provide RSSI from FrSky receiver to APM.

  • Select the input pin with the RSSI_PIN parameter.
  • However some of receivers such as FrSky D8R-XP output 0 - 3.3 V.
  • For that reason I’ve added new parameter: RSSI_RANGE.
  • This was also a requested issue previously:
  • When the RSSI_RANGE parameter is set to your radio’s maximum RSSI voltage the RSSI rxrssi is shown in the range 0-100.
  • The ability to set the RSSI_RANGE parameter has been added to Mission Planner in the Full Parameter List:

Complete System with RSSI addition


RSSI Filter

A 4.7k resistor and 10uF capacitor are used to filter out the pulses from the receiver’s RSSI output.


RSSI Connections


Developed and illustrated by Lukasz - Thank You - Hope this helps.