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Subject: Re: Capacitance Sensor for distance and human recognition
Date: Mon, 09 Sep 2002 12:50:04 +0200
NNTP-Posting-Date: Mon, 9 Sep 2002 10:44:11 +0000 (UTC)
X-Mailer: Mozilla 4.78 [en] (Win98; U)
You can find some stuff about that, if you search google for "capacitive
As the capacitance from sensor to person and from person to ground depends
in a lot of factors out of your control, detecting the distance will never
I suggest you switch into "Ultrasound sensor".
> Hello Every body,
> I am working on the capacitive sensor for detecting the person head
> and the distance to the person from the sensor(distance Max.30 cm). I
> am using only single plate the other ground will be the object itself.
> I had an oscillator from CMOS. How could I approach further? whether I
> can use the same capacitor in an oscillator as a detector and how big
> the sensing electrode should be? How can I measure the amplitude for
> measuring the distance or change in frequency. As I am completey new
> to this field if any one help me out that would be very nice of them.
> It would be very nice to send a piece of circuit drawing to have a
> clear understanding.
> Thanks in Advance
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