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Merge pull request #9460 from noah95/rssi-scale-doc

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Rssi scale documentation
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Michael Keller 2020-02-09 08:02:41 +13:00 • committed by GitHub
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docs/Rssi.md
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@ -54,7 +54,7 @@ Note: Some systems invert the RSSI ( 0 = Full signal / 100 = Lost signal). To co
set rssi_invert = ON
```
## RSSI_SCALE setup method:
### RSSI_SCALE setup method
- set rssi_scale = 100. The displayed percentage will then be the raw ADC value.
- turn on RX (close to board). RSSI value should vary a little.
@ -63,3 +63,26 @@ set rssi_invert = ON
FrSky D4R-II and X8R supported.
The feature can not be used when RX_PARALLEL_PWM is enabled.
## RSSI_SCALE setup method
To calculate the rssi offset and scale, check the rc value at full signal (`rssi_fullsig`) and at almost no signal strength (`rssi_nosig`).
Then, calculate the offset and scale values using the following formula:
```
rssi_offset = 1000-(rssi_nosig) / 10
rssi_scale = 100 * 1000 * (rssi_fullsig - rssi_nosig)
```
Examples are:
| RC System | RC value at full strength | RC value at no strength | `rssi_offset` | `rssi_scale` |
|:----------|:--------------------------|:------------------------|:--------------|:-------------|
| Graupner | `1900` | `1100` | `-10` | `125` |
Then set these values via CLI:
```
set rssi_offset = -10
set rssi_scale = 125
```