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PIC based wattmeter concept

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evios

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pic wattmeter

I am planning to have this project implemented. But I had not much knowledge on circuits.

3325420949_6099cd278a.jpg

Bigger picture here

Well, 1st of all is the part on the input at RA0 served as the voltage sensor. I am not very sure on why there is a potentiometer located parallely with the 4k7 resistor. Voltage divider concept?

Another part is on the Op-Amp, scales the current up and read to RA1. Pretty bad that the inverting part is too complex to understand.

Can anyone provide me with useful and details on it? Thanks, i really appreciate it.[/url]
 

pic based wattmeter

the pot is a voltage divider only...

the opamp is connected as a non inverting summer. The resitors in the inverting side scale down the sum of the voltage applied to the non inverting side. one of the voltage is a fixed value determined by the zener, the other of course is the calue across the .001 resistor..
 

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