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  1. 19-11-2013 #1
    EddyCurrent's Avatar
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    EddyCurrent
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    Quote Originally Posted by Jonathan View Post
    If the breakout board output is open collector, why not reduce the component count by using a PNP transistor to invert the signal?

    e.g:
    Click image for larger version.  Name: trswipnp.gif  Views: 4019  Size: 3.8 KB  ID: 10834

    Edit: Also don't forget the back-emf protection diode!
    That would be a sensible solution Jonathan and one that I shall test, thank you
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  2. 19-11-2013 #2
    irving2008's Avatar
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    Quote Originally Posted by EddyCurrent View Post
    That would be a sensible solution Jonathan and one that I shall test, thank you
    Be very, very sure the BOB output is truely open collector if Vs = 24v or at best it won't work (I'll leave it to the reader to explain why :) ) and at worst you could fry the BOB!

    Alternatively make Vs = 5v

    Rb for Vs = 5v is 1k
    Rb for Vs = 24v is 4k7

    1/4w resistors will be fine
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