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Added permisions section to readme.md

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Ben Hardill 2014-06-20 11:04:16 +01:00
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hardware/powermate/README.md
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@ -20,4 +20,15 @@ This node outputs messages for 3 different events
For the first 2 the message payload of 'up' or 'down' respectively is published to the topic + '/button'. For the wheel rotation the message payload is +ve for clockwise and -ve for anti-clockwise on the topic + '/wheel'
Permissions
-----
Depending on OS, you may get an error that looks something like
cannot open device with path 0001:0004:00
If this happens, it is likely because your user doesn't have permissions for the PowerMate device. In Linux (specifically Raspbian), creating the file /etc/udev/rules/95-powermate.rules and entering the following text:
SUBSYSTEM=="usb", ATTRS{idVendor}=="077d", ATTRS{idProduct}=="0410", SYMLINK+="powermate", MODE="660", GROUP="input"
will assign the PowerMate device to the "input" group, which the pi user belongs to. For other OSs, change the GROUP entry to a group that your user belongs to.