HOW TO – Make a doorknob touch alarm

HOW TO – Make a doorknob touch alarm

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A MAKE reader sent in this handy doorknob alarm project – “A excellent analysis of a DIY circuit that buzzes when someone touches your doorknob. A lot better than a sock and it could be extended to ring your doorbell or worked into a home automation system.”Link.

6 thoughts on “HOW TO – Make a doorknob touch alarm

  1. aplumb says:

    Ok, you lost me. Better than a sock.?.

  2. jbuell says:

    It’s more clear in the actual post, but he’s talking about the “busy signal” roommates have.

  3. manav says:

    its tooooooooo complicated

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