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5v relay

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  • 16-11-2014 9:22pm
    #1
    sharkbite1983
    Registered Users Posts: 125 ✭✭


    Quick question, is there such a thing as a relay/contactor that would switch a 240 vac using a 5vdc signal to switch the contactor?


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    #2
    crasy dash
    Registered Users Posts: 1,605 ✭✭✭crasy dash


    Most important thing is when ordering get one with the correct contact rating for your application.

    What exactly are you hoping to do.
    How big of a load are you switching, frequency of operation is another important one.

    Sorry for the dumb questions but it will help us help you:D
    Did you try radionics.ie??


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    #3
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,595 Mod ✭✭✭✭2011


    sharkbite1983 wrote: »
    Quick question, is there such a thing as a relay/contactor that would switch a 240 vac using a 5vdc signal to switch the contactor?


    Google MOSFET or IGBT


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    #4
    gctest50
    Registered Users Posts: 9,605 ✭✭✭gctest50


    http://www.hobbytronics.co.uk/20a-relay-board-kit


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    #5
    sharkbite1983
    Registered Users Posts: 125 ✭✭sharkbite1983


    crasy dash wrote: »
    Most important thing is when ordering get one with the correct contact rating for your application.

    What exactly are you hoping to do.
    How big of a load are you switching, frequency of operation is another important one.

    Sorry for the dumb questions but it will help us help you:D
    Did you try radionics.ie??

    Not a dumb question at all, to be honest I havent checked radionics, it just for a little project i wanna try at home, to be able to remotely control my lights and heating from a phone app. basically like smart homes & climote/nest all rolled into 1 (Cheap) homemade system.

    I'll have a look on radionics now, am i right in saying Id need a contact with a 5vdc coil & 240 contact? Im not sure what exactly to be looking for!


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    #6
    sharkbite1983
    Registered Users Posts: 125 ✭✭sharkbite1983


    gctest50 wrote: »
    http://www.hobbytronics.co.uk/20a-relay-board-kit


    sweet, thats the job. thanks man


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    #7
    crasy dash
    Registered Users Posts: 1,605 ✭✭✭crasy dash


    Hate to be nosey but how will you be giving it the 5v dc is it through an alarm system just a bit curious myself now.

    Keep us updated how you get on anyways and looking at the link its only rated at 8a in the terminals yoo have to solder direct on board for the 20a rating


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    #8
    DublinDilbert
    Registered Users Posts: 5,380 ✭✭✭DublinDilbert


    You can pick up little relay boards designed for use with the arduino etc...

    These have a relay capable of switching 220v and have a drive transistor for the coil, which takes 5v signal.

    You pick these up for about €1-€2 on ebay


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    #9
    sharkbite1983
    Registered Users Posts: 125 ✭✭sharkbite1983


    Thanks but Ive ordered some now,

    A friend is writing an app that send the 5v signal over wifi, and hoping that will switch on my 220v circuit. For now itll only work when in the same wifi network, but my friend the rain man is doing something with a cloud server thatll make it possible to control from anywhere (im the electrician, he's the whiz kid). for now we are going to make a sample board that will control some basic circuits. Im also playing around with the thought of adding an audio system too, but one step at a time.


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