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  1. #11
    Quote Originally Posted by mturneruk View Post
    OK Great. Thanks Jazz.


    So am i right in saying I need NC ones. So that when it detects something it opens and breaks the circuit ?

    Does NPN or PNP matter for my purposes ?

    Do these look like they will do the job?
    http://www.ebay.co.uk/itm/1-5Pcs-Ind...U0u32s_xiK0nkw

    Thanks again for all your help. Couldn't of done without it.

    Cheers
    Martin
    It depends on the BOB you are using. the one's you have linked to are about £4 each I have linked to some for £1.41 http://www.ebay.co.uk/itm/1417817891...c=1&rmvSB=true
    these are NO so would need to be wired in parallel if you only want to use one input on the BOB for the three switches.
    .
    If your BOB has hardwired pullups to 5 V you would need NPN type. otherwise either will do.
    Last edited by Clive S; 29-11-2015 at 08:27 PM.
    ..Clive
    The more you know, The better you know, How little you know

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