[UNRESOLVED] Read pulse from PC FAN via Input Capture

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swanduron
Posts: 10
Joined: Mon Mar 13, 2017 9:03 am

[UNRESOLVED] Read pulse from PC FAN via Input Capture

Post by swanduron » Sun Jul 02, 2017 7:47 am

Hi guys,

I try to read the FAN speed from 3 pin PC fan, and my code as below.

I seen the result is incorrect and unstable, the pull-up res is 10K and connect to 3.3v pin. Anyone can help on this case?

ic_pin = pyb.Pin.board.X4
ic = t2.channel(4, pyb.Timer.IC, pin=ic_pin, polarity=pyb.Timer.RISING)
ic.capture()

Regards
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