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Update switch.rpi_gpio.markdown (#3662)

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I found the current documentation confusing as it did not clearly state whether the code is look at the pin # or GPIO #. Looking on the forums others were having the same issue. My goal is to make it clear that GPIO # is what users should be entering into their configs.
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dmschlab 2017-10-18 15:51:26 -04:00 committed by Fabian Affolter
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source/_components/switch.rpi_gpio.markdown
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@ -30,8 +30,20 @@ switch:
Configuration variables:
- **ports** array (*Required*): Array of used ports.
- **port: name** (*Required*): Port numbers and corresponding names.
- **port: name** (*Required*): Port numbers and corresponding names (GPIO #).
- **invert_logic** (*Optional*): If true, inverts the output logic to ACTIVE LOW. Default is false (ACTIVE HIGH).
For more details about the GPIO layout, visit the Wikipedia [article](https://en.wikipedia.org/wiki/Raspberry_Pi#GPIO_connector) about the Raspberry Pi.
A common question is what does Port refer to, this number is the actual GPIO # not the pin #.
For example, if you have a relay connected to pin 11 its GPIO # is 17.
```yaml
# Example configuration.yaml entry
switch:
- platform: rpi_gpio
ports:
17: Speaker Relay
```