About grove electricity sensor and Wattmeter

Dear development team,
I am trying to use your electricity sensor to build a wattmeter. Right now, I am obtaining result which are pretty wrong (3 times what it should be).
I am using your formula:

amplitude_current=(float)sensorMax/1024*5/800*2000000;
effective_value=amplitude_current/1.414;
power_consumption = (effective_value * EFFECTIVE_TENSION)/1000; //Calcul of effective power
Being in Japan, EFFECTIVE_TENSION should be 100 volts.
I have some question about your amplitude current formula. You use 5 volts in your calculation but in your sensor spec the sampling voltage is between 0 and 2 Volts. Is there an update mistake in your wiki? Did I misunderstand it?
Thanks in advance for your support,

Cyril

Statistics : Posted by cyril.perissol • on Thu Dec 19, 2013 8:46 am • Replies 0 • Views 2

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