AVR-Chat

On Wed, Nov 19, 2008 at 1:12 AM, xolang1 <xolang1@yahoo.com> wrote:

>   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.
>




The inductive based ones from Microchip would not have glove issues.
Capacitive based ones would, as well as water issues.
Here is a comparasion chart:

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2599&param=en531501


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