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Rssi.md

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RSSI

RSSI is a measurement of signal strength. RSSI is very handy so you know when you are going out of range or there is interference.

Some receivers have RSSI outputs. 3 types are supported.

  1. RSSI via PPM channel
  2. RSSI via Parallel PWM channel
  3. RSSI via ADC with PPM RC that has an RSSI output - aka RSSI ADC

RSSI via PPM

Configure your receiver to output RSSI on a spare channel, then select the channel used via the cli.

e.g. if you used channel 1 then you would set:

set rssi_channel = 1

RSSI via Parallel PWM channel

Connect the RSSI signal to any PWM input channel then set the RSSI channel as you would for RSSI via PPM

RSSI ADC

Connect the RSSI signal to the RC2/CH2 input. The signal must be between 0v and 3.3v to indicate between 0% and 100% RSSI. Use inline resistors to lower voltage if required, inline smoothing capacitors may also help.

FrSky D4R-II and X8R supported.

Enable using the RSSI_ADC feature:

feature RSSI_ADC

The feature can not be used when RX_PARALLEL_PWM is enabled.