On Sat, 23 Jun 2001, Jeethu Rao wrote:

>
> So, the voltage I'll be getting will be the peak voltage. How do I get the
> RMS Voltage ?
> Any ready made algorithms on PICList would be great.


  Of course you dont need any PIC algorithm to decrease a voltage with
1.41 ( sqrt 2 ) from initial value. You need just a potentiometer or two
resistors. And keep your electronics isolated from the 220...240V mains.
Else you'll can't talk with other devices only through optoisolated
devices: RS232/485 etc.
Vasile






>
>
> If you rectify the 230VAC first you can use a very non-perfect
> rectifier.  The errors will be insignificant vs. the 300VDC result.
> Then use a resistive divider to reduce the 300V to 5V for the PIC A/D.
>
> The will give you the average voltage level.  If you are looking for
> single cycle dropouts you will have to do something faster, probably
> synchronized to the power line frequency.
>
> Do you need to isolate the PIC ground from the AC mains?
>
> Sherpa Doug
>
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