DHT22 and PIC18F25K22

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  1. - 13th November 2017, 20:35 #1
    harryweb's Avatar
    harryweb
    harryweb is offline Junior Member
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    Default DHT22 and PIC18F25K22

    Hi I'm using a PIC18F25K22 to drive 2x DHT22.
    I found here some code working on PORTB.4
    The other DHT is connected on PORTB.2 and... not working
    I tried to exchange the 2 DHT22 without success. The 2 DHT22 are working fine on portB.4
    Name: dht22.JPG Views: 791 Size: 138.0 KB

    sequence is:
    TRISB.2 = 1 'input
    my program... then
    TRISB.2 = 0 'output
    PORTB.2 = 0 'low

    With my DSO, I can see something strange. It takes more than 1mSec to become low (see curve)
    Name: elecdif.jpg Views: 683 Size: 133.3 KB


    This is only on PORTB.2 !
    May be you have an idea ? (I'm using PBP2.60)
    Regards
    Last edited by harryweb; - 13th November 2017 at 20:46.
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