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docs/Rssi.md

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+# RSSI
+
+RSSI is a measurement of signal strength and is very handy so you know when your aircraft isw going out of range or if it is suffering RF interference.
+
+Some receivers have RSSI outputs.  3 types are supported.
+
+1. RSSI via PPM channel
+1. RSSI via Parallel PWM channel
+1. 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 9 then you would set:
+
+```
+set rssi_channel = 9
+```
+Note: Some systems such as EZUHF invert the RSSI ( 0 = Full signal / 100 = Lost signal). To correct this problem you can invert the RSSI scale so you will get a correct reading by using these commands:
+
+```
+set rssi_min = 100
+set rssi_max = 0
+```
+Default is set to "0" for normal operation ( 100 = Full signal / 0 = Lost signal).
+
+## 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.
+Use inline resistors to lower voltage if required; inline smoothing capacitors may also help.
+A simple PPM->RSSI conditioner can easily be made. See the  PPM-RSSI conditioning.pdf  for details.
+
+Under CLI :
+- enable using the RSSI_ADC feature  :  `feature RSSI_ADC`
+- set the RSSI_SCALE parameter (between 1 and 255) to adjust RSSI level according to your configuration.
+
+
+FrSky D4R-II and X8R supported.