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atbetaflight/docs/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 PWM with PPM RC that does not have RSSI output - aka RSSI PWM

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 PWM

Connect the RSSI PWM signal to the RC2/CH2 input.

Enable using the RSSI_PWM feature:

feature RSSI_PWM

The feature can not be used when RX_PARALLEL_PWM is enabled.

RSSI PWM Providers

When using RSSI PWM it is possible to use standard ~18ms RSSI signals or a faster 1khz/1m RSSI signal.

The RSSI output on the FrSky X8R (and probably the FrSky X6R) is 1khz.

To support the 1khz rate enable it via the cli:

set rssi_pwm_provider = 1
Value Meaning
0 ~18ms pulse
1 1ms pulse