OpenSprinkler Forums Hardware Questions What type of TVS diode across a 24 VAC sprinkler valve

This topic contains 4 replies, has 2 voices, and was last updated by  frankpc3 2 weeks, 1 day ago.

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  • #60927

    frankpc3
    Participant

    When my sprinkler valves shut off, back emf frequently adversely affects my microcontroller.

    I am assuming a TVS diode should be placed across each relay output connected to each of the 24 VAC zone valves.

    Can anyone offer advice regarding which type of protective diodes to purchase?

    Thank you

    #60937

    Ray
    Keymaster

    What version of OpenSprinkler are you using? Or this is your own hardware? OpenSprinkler has TVS diode on every zone.

    #60941

    frankpc3
    Participant

    This is my hardware and software. I was reading about OpenSprinkler and noticed that each zone uses a TVS. And I was wondering which TVS diode is being used.

    #60973

    Ray
    Keymaster

    It uses SMBJ43CA.

    #60983

    frankpc3
    Participant

    Thank you Ray. That looks like a pretty inexpensive way to protect for the back EMF. It seems an axial equivalent is the P6KE51CA. I plan to buy 10 of those and put them across my valves.

    thanks again.

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OpenSprinkler Forums Hardware Questions What type of TVS diode across a 24 VAC sprinkler valve