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You are confusing ENERGY with POWER. Kwh is energy. Watts is power.
Rate of use, not rate of change - that would indicate a derivative.
Power x Time = Energy
Energy/Time = Power
That wattmeter is designed for only 3.6-25V, it is not good for household voltage (110V-220V).
You can buy a watt-hour meter cheaply -
Amazon.com: P3 International P4460 Kill A Watt EZ Electricity Usage Monitor: Electronics
If you want to build the wattmeter project, you can modify the code to find kwh. Read the wattage every second, add the watts up, divide by 3,600 to get watt-hours, divide again by 1,000 to get kwh.
AC seems a bit tricky for me.
Well ... as the project goes i just wonder, how it knows the value of current and the voltage input?
Which of the component is responsible for this?
That's not 1 ohm, look again.
Don't make a shunt resistor - buy one. It's too difficult to predict and read the actual value, copper wire has too high of a temperature coefficient to be trusted.
What, a buck? Fifty cents? Look for a better price, there are some they want $12 for, yeah, but there are cheap ones, too.
ya.... i juz manage to get myself a 1Ohm resistor. I know the schematic doesnt use this value.
but seems like shunt resistor cost a lot too if compare to my project... sigh**
There is a HUGE Difference between 1 Ohm and the 0.001 Ohm Shunt that is in that Schematic. A 1 Ohm Shunt is Not at all Practical here.
Ya i know....
but calibrating the shunt is hard as well...
even the components also cost a lots ...
any idea about this?