Dwayne Reid ha scritto:
> In my case, I threw extra parts at the problem to make the software 
> easier and to allow the PIC pin to work as both an input and an 
> output.  The 120Vac input is sampled with a 100K resistor, then 
 > [...]

> The software samples the input every 1.024ms and feeds a 16 times IIR 
> filter.  The output of that filter is then fed into a peak detector 
> with a period of 20ms (20 ticks of 1.024ms each).
> 
> This allows me to accurately measure the 120Vac line voltage and make 
> decisions on whether to allow system operation or not.


this is perfectly good :)
I will consider the shunting diodes, and I do have transformer so 
isolation should not be an issue.

Do you have a quick link for the IIR filter? I know it has been 
published and commented tons of times but...

thanks

-- 

Ciao, Dario
--
Cyberdyne
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