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OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › OSPI PIN DEFINES explanation

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  • May 6, 2013 at 6:26 am #22418

    raymartinshair
    Member

    Hi,

    I am currently writing a web UI and controller for the Opensprinkler and Raspberry PI to run on mono and have a question about the pin defines in the sample python scripts.

    what does the pin_sr_noe = 17 represent? I think I understand the other pins see below for details. Any help would be much appreciated.

    # OSPI PIN DEFINES
    pin_sr_clk = 4 (shift register clock)
    pin_sr_noe = 17 (???????????)
    pin_sr_dat = 21 # NOTE: if you have RPi rev.2, change this to 27 (shift register data)
    pin_sr_lat = 22 (shift register latch)

    Cheers
    Adam

    May 6, 2013 at 12:39 pm #23603

    Ray
    Keymaster

    NOE is the shift register Output Enable (active low) pin. A logic high disables output, and a logic low enables.

    May 13, 2013 at 8:24 pm #23604

    raymartinshair
    Member

    Thanks for the heads up Ray.

    Cheers
    Adam

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OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › OSPI PIN DEFINES explanation