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Sensing hand presence — Parallax Forums

Sensing hand presence

ArchiverArchiver Posts: 46,084
edited 2001-10-16 12:02 in General Discussion
I am working on a project where a sensor senses the present of a
hand when gets withing 1/2" of its surface and have that signal
detected by a stamp. I know that there are some capacitive solution
to that but not sure how. Any ideas?

Al Najjar

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2001-10-16 08:23
    >I am working on a project where a sensor senses the present of a
    >hand when gets withing 1/2" of its surface and have that signal
    >detected by a stamp. I know that there are some capacitive solution
    >to that but not sure how. Any ideas?
    >
    >Al Najjar

    Try http://www.qprox.com/. I have their e11x demo board which I think
    was around $15 and does exactly that, sends out +5v if you get within
    about .5 inches of the sensing area. You can extend the sensing area
    by attaching a wire to the board and running it wherever you want the
    sensor to be active. Relatively cheap and easy to use. And If I can
    get something to work, then believe me, it's easy to use... [noparse];)[/noparse]

    If you want the IC without the fancy board it should be under $2
    each. Here's a link to the IC I think you could use >
    http://www.qprox.com/products/qt11x.php3

    Mark
  • ArchiverArchiver Posts: 46,084
    edited 2001-10-16 12:02
    >I am working on a project where a sensor senses the present of a
    >hand when gets withing 1/2" of its surface and have that signal
    >detected by a stamp. I know that there are some capacitive solution
    >to that but not sure how. Any ideas?

    An alternate solution would be an infrared emitter/detector pair
    available at Radio Shack. There was an article in last year's
    October issue of Nuts & Volts demonstrating this.

    Carl
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