CommentStreams:Bf0784e4a9fa599980ec7ccadf095f1c

I have the same problem

Traceback (most recent call last):

 File "/home/pi/x735-script/read_fan_speed.py", line 29, in <module>
   GPIO.add_event_detect(TACH, GPIO.FALLING, fell)

RuntimeError: Failed to add edge detection