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26th September 2013, 16:16 #1
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how can i calculate the AC power used by any appliance like fan with ATMega32
I am doing my BE Engg project.
Name: "HOME AUTOMATION & POWER MANAGEMENT"
I want calculate the power used by each appliance in ON state. so that we can monitor power used in home. and I can draw it in MATLAB.
I am using ATMega32 MCU in my project to switch ON/OFF each appliance.
I think i have to calculate the current consumption by appliance.
but i don't know how to do it.
if any one tried this please help.
Thank you.

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26th September 2013, 17:49 #2
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Re: how can i calculate the AC power used by any appliance like fan?
http://www.consumerreports.org/cro/m...onitorsov.htm is a review on wattmeters, you could use the cheaper one as a check on your data collected. P = VI, so with known wall voltage you should be able to caclulate power from your current measurements. You can use a hall effect sensor to measure the current.
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26th September 2013, 18:05 #3
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Re: how can i calculate the AC power used by any appliance like fan?
Use Hall sensors such is A1302 or similar.
Best regards,
Peter“Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” Nikola Tesla
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9th October 2013, 06:00 #4
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Re: how can i calculate the AC power used by any appliance like fan with ATMega32
@tpetar
I think Hall sensors are used to only measure the DC current,not AC current. ????????//

9th October 2013, 11:38 #5
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Re: how can i calculate the AC power used by any appliance like fan with ATMega32
“Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” Nikola Tesla
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