It's a long shot but ........

Has anyone seen interface cards/circuits for sale to provide this 
protection to a microcontroller?
I'm thinking of a small multi-port add-in board that would provide a 
level of protection similar to what a typical PLC has.

--Jeff


Brent Brown wrote:
> Circuits vary, but some of the things they have are: Low impedance to prevent false 
> triggering, plus good filtering. Over voltage and reverse voltage protection. Often 
> optocoupling for isolation and decoupling of electrical noise. Defined threshold 
> voltages. Also not to be overlooked - good debounce software in the micro.
>   
-- 
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