AVR-Chat

----- Original Message ----- 
From: "xolang1" <xolang1@yahoo.com>
To: <AVR-chat@yahoogroups.com>
Sent: Wednesday, November 19, 2008 6:12 AM
Subject: [AVR-Chat] touch sensor?


> Hi again,
>
> There is this 3 meter long "stainless" hollow metal rod.
> This is the kind of material used in hand railings and
> barriers. A person might grasp anywhere along the length
> of this rod.
>
> The requirement is for an AVR to be able to detect if a human hand
> is there or not(a 1 or 0 will do).
>
> Was thinking of capacitance sensors, however, I havnt seen one
> that uses a rod instead of a metal plate.
>
> Anyone here encountered one? or is there a better way to do this
> kind of sensing?

Make it an element of an RF oscillator and detect the change in frequency 
when it is grasped?

Leon