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  1. #12
    These are the ones I used;
    http://www.ebay.co.uk/itm/2pcs-SN04-...item5d38dcb5f5
    Albeit on a router, they work well and are very repeatable. Because they are 3 wire NPN you can power them from a 24v supply but still connect the output to your 5v bob input where they either leave it open (high) or short it to ground (low).
    The drawing here shows how they are connected; (bottom left corner of drawing)
    http://www.mycncuk.com/threads/6565-...7622#post57622
    Last edited by EddyCurrent; 14-07-2014 at 05:39 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

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