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43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
# RSSI
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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.
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Some receivers have RSSI outputs. 3 types are supported.
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1. RSSI via PPM channel
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1. RSSI via Parallel PWM channel
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1. RSSI via ADC with PPM RC that has an RSSI output - aka RSSI ADC
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## RSSI via PPM
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Configure your receiver to output RSSI on a spare channel, then select the channel used via the CLI.
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e.g. if you used channel 9 then you would set:
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```
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set rssi_channel = 9
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```
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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:
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```
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set rssi_min = 100
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set rssi_max = 0
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```
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Default is set to "0" for normal operation ( 100 = Full signal / 0 = Lost signal).
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## RSSI via Parallel PWM channel
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Connect the RSSI signal to any PWM input channel then set the RSSI channel as you would for RSSI via PPM
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## RSSI ADC
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Connect the RSSI signal to the RC2/CH2 input. The signal must be between 0v and 3.3v.
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Use inline resistors to lower voltage if required; inline smoothing capacitors may also help.
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A simple PPM->RSSI conditioner can easily be made. See the PPM-RSSI conditioning.pdf for details.
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Under CLI :
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- enable using the RSSI_ADC feature : `feature RSSI_ADC`
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- set the RSSI_SCALE parameter (between 1 and 255) to adjust RSSI level according to your configuration.
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FrSky D4R-II and X8R supported.
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