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hand sensor

bigkim100

Apr 17, 2013
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Apr 17, 2013
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I would like as simple as possible circuit that can detect a human hand from anywhere from 6 to 12 inches.
It needs to trigger a 555, and run on either 5 or 9Vdc.
I tried the attached schematic, and unless you actually have to touch the antenna to trigger.
Thanks in advance for any help,
Kim
 

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Audioguru

Sep 24, 2016
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C5 will probably prevent radio signals from activating it. It will not work if there is no AC electricity near the human.
It will need a 1.2V input signal to begin turning on but needs much more sensitivity to do what you want.
 

Harald Kapp

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Nov 17, 2011
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Do you need to detect specifically a human hand, or any object?
  • For any object a radar sensor can be used.
  • For any human body part a PIR sensor can be used.
  • If you need to specifically detect a hand, I think you'll have to use a camera and a vision processing system to distinguish between a hand and any other object. A raspberry Pi plus camera plus some programming can do the job.
 
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