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POHow to read out scroll wheel info from /dev/input/mice?
 

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  1. POHow to read out scroll wheel info from /dev/input/mice?
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    <p>For a home robotics project I need to read out the raw mouse movement information. I partially succeeded in this by using the python script from <a href="https://stackoverflow.com/a/12286738/1650012">this SO-answer</a>. It basically reads out /dev/input/mice and converts the hex-input into integers:</p> <pre><code>import struct file = open( "/dev/input/mice", "rb" ) def getMouseEvent(): buf = file.read(3) button = ord( buf[0] ) bLeft = button &amp; 0x1 bMiddle = ( button &amp; 0x4 ) &gt; 0 bRight = ( button &amp; 0x2 ) &gt; 0 x,y = struct.unpack( "bb", buf[1:] ) print ("L:%d, M: %d, R: %d, x: %d, y: %d\n" % (bLeft,bMiddle,bRight, x, y) ) while True: getMouseEvent() file.close() </code></pre> <p>This works fine, except for the fact that the scroll wheel information is missing. Does anybody know how I can get (preferably with python) the scroll wheel information from /dev/input/mice?</p> <p>[EDIT] Okay, although I didn't manage to read out the /dev/input/mice, I think I found a solution. I just found the evdev module (sudo pip install evdev) with which you can read out input events. I now have the following code:</p> <pre><code>from evdev import InputDevice from select import select dev = InputDevice('/dev/input/event3') # This can be any other event number. On my Raspi it turned out to be event0 while True: r,w,x = select([dev], [], []) for event in dev.read(): # The event.code for a scroll wheel event is 8, so I do the following if event.code == 8: print(event.value) </code></pre> <p>I'm now going to test this on my raspi and see how that works. Thanks for all the inspiration guys and girls!</p>
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