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From: John Devereux
Subject: Re: Reverse sensor
Date: Tue, 17 Sep 2002 15:27:22 +0100
NNTP-Posting-Date: Tue, 17 Sep 2002 14:26:07 +0000 (UTC)
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firstname.lastname@example.org (Mumtaz) wrote:
>I want to make a capacitive sensor which can detect the distace while
>reversing a car to stop before collision. For this I need atleast to
>measure upto 30 to 40 cms. I want to use here only capacitive sensors.
>I had built one prototype but it is limited in range it cant measure
>beyond 2 cm. In this one I had used oscillator to produce frequency
>and a copper plate as electrode to note the changes in the
>capacitance. Any one has some ideas to measure the larger distances.
>Please help me out.
The range ought to scale with the size of the plate. So use
a bigger one. Use the plate capacitance to set the frequency
of an oscillator. You could use a small microcontroller to
look for frequency changes.
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