# Designing power consumption meter

#### evios

Joined Nov 9, 2008
29
I was having my project on Automatic Meter Reading. The part on the power meter really cause a big problem for me as measurement cant be taken easily although the hardware is well configured with LCD, however i still need to make a simple power consumption meter for my own using PIC.

I'd asked my supervisor opinion, and he suggest me with PIC. Does anyone can provide me with a detailed circuits that may works? PIC act as a controller, whenever PIC sense 0V, it will not starts measuring, else it will and keeps accumulating the power consumptions (can be in voltage and current). I might needs some help and guidance from all the experts here.

Thank you so much

#### BillO

Joined Nov 24, 2008
990
Evios, why ask for finished solutions to your problem? What will you learn or accomplish from that?

Power comsumption is energy used, watt-hours.

Can you design a PIC based system that can measure current (A) and voltage (V)?

Power (Watts) are given by V*A

Power consumption (Watt-hours) is given by V*A*time

Sample the voltage and current on a frequent basis (maybe every hundreth of a second, or whatever) and multiply by the time base in order to do a piece-wise integration. Accumulate (add it up) over an hour and calculate the Watt-hours used in this fashion.

#### John Luciani

Joined Apr 3, 2007
477
Texas Instruments has a few power meter applications notes for the MSP430.
They may also even have a reference design. Even if you don't use the MSP430
you may find some useful information there.

(* jcl *)

#### evios

Joined Nov 9, 2008
29
Evios, why ask for finished solutions to your problem? What will you learn or accomplish from that?

Power comsumption is energy used, watt-hours.

Can you design a PIC based system that can measure current (A) and voltage (V)?

Power (Watts) are given by V*A

Power consumption (Watt-hours) is given by V*A*time

Sample the voltage and current on a frequent basis (maybe every hundreth of a second, or whatever) and multiply by the time base in order to do a piece-wise integration. Accumulate (add it up) over an hour and calculate the Watt-hours used in this fashion.
Well, I might have over request for that. Because I starts everything from nothing, causing me a bit over for it. Well, I need it as references for the circuits, because my major part is not on that, mainly on the RF. Well anyway, thanks for your explanation too.

Texas Instruments has a few power meter applications notes for the MSP430.
They may also even have a reference design. Even if you don't use the MSP430
you may find some useful information there.

(* jcl *)
Well, thanks for that. I will look further for it.