Hi, I just joined the forum as I am about to start my own home energy monitor project.
I saw some great information about using a CT clamp SCT-013-000 interfaced with an Arduino. (https://learn.openenergymonitor.org/electricity-monitoring/ctac/how-to-build-an-arduino-energy-monitor)
The schematic suggests using a 9V AC/AC power adapter (along with resistors and a cap) to measure the voltage.
However the CT specs say, that using an ‘inbuilt resistor’ you can measure voltage and current directly from the CT clamp. (“Two form of output - current, voltage (voltage output built-in the sampling resistor)”)
So, is the 9V supply actually necessary, and can the voltage just be measured somehow from the CT as suggested?
How would it affect the schematic?
Any help greatly appreciated.