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Update gpio.md

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Maxim Devaev 2020-09-20 04:06:23 +03:00 committed by GitHub
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@ -153,6 +153,8 @@ The driver `gpio` provides access to regular GPIO pins with input and output mod
You can use the [interactive scheme](https://pinout.xyz/) when selecting the pins to use. Please note that when selecting a pin for a channel, you need to use a logical number instead of a physical number. That is, if you want to use a physical pin with the number 40, the channel must have the number 21 corresponding to the logical GPIO21.
Channels should not use duplicate pins. You can also not use already used pins. To see which pins are currently used, run the command `gpioinfo`.
### USB HID Relay
The driver `hidrelay` provides access to cheap managed [USB HID relays](http://vusb.wikidot.com/project:driver-less-usb-relays-hid-interface) that can be found on AliExpress. This driver does not support input mode, only output. To use it, you need to specify the path to the device file (like `/dev/hidraw0`) using the `device` parameter.
@ -160,3 +162,5 @@ Additionally, we recommend to configure access rights and static device name usi
```
SUBSYSTEM=="usb", ATTR{idVendor}=="16c0", ATTR{idProduct}=="05df", MODE="666"
```
Channels should not use duplicate physical numbers.