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 this SO-answer. It basically reads out /dev/input/mice and converts the hex-input into integers:
import struct
file = open( "/dev/input/mice", "rb" )
def getMouseEvent():
buf = file.read(3)
button = ord( buf[0] )
bLeft = button & 0x1
bMiddle = ( button & 0x4 ) > 0
bRight = ( button & 0x2 ) > 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()
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?
[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:
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)
I'm now going to test this on my raspi and see how that works. Thanks for all the inspiration guys and girls!
