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29-11-2015 #11
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.
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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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