I am wanting to monitor my aquarium power usage, this will be on a New Zealand 230v, 50 hz system. It all runs from a single power point.
In my setup there is the following:
- 2 Filters - about 10 watts
- 2 heaters - potentially 600w if both are on
So I am wanting to use the CT Clamp with produces via a burden resister an AC voltage.
In my testing with a 1000w/2000w fan heater which would draw close to 5 Amp at 1000w
Now running the heater at 1000w I see an AC voltage of 0.023, if I switch the heat to 2000w it jumps to 0.46 volts AC
I have been looking around and playing with some circuits to try to convert this to DC. At the moment I am running this on a multimeter but I want to use an Arduino to save this data.
Since the voltages are so low what are induced from the CT Clamp I am thinking of a precision rectifier circuit to convert to DC. I would like to make 10amp = 5v.
So 5 amp (heat running at 1000w) = approx 2.5 volts.
Looking at https://www.sparkfun.com/products/11005
there was a comment that pointed to a PDF at http://www.crmagnetics.com/Products/Assets/ProductPDFs/Precision%20Rectifier%20Circuit%20for%20CT%20Signal%20Conditioning.pdf
I have tried to follow along but I am confused.
The diagram mostly makes sense and the description.
But there is a Capacitor and a Resister on the right edge of the diagram that I do not know what to use.
Also the diagram has two inputs from the CT Clamp - but only 1 output - and this confuses me as well.
If I run the LM324 (or LM528 in my case) from 5v so I use the ground from the power supply source?