CT sensors

Using Arduino Project Guidance
1

Hi, I have four CT sensors (three SCT 013 000 and one SCT 013 030). It says in the former that it outputs 50mA but I'm not sure with the latter. I want to ask if Arduino can support these four sensors without breaking or something?

Also, I'm trying to calibrate these sensors by attaching it all on the same wire of the laptop charger.

  emon5.current(5, 77.9);             
  emon4.current(4, 32.2);
  emon2.current(2, 88.8);

This is the part where I calibrate right? Is there a way how to know what values to put in like some calculations or do I have to guess the values and hopefully get it calibrated.
Also, I tried putting the analog pins to another since I thought some were not working properly.

Thank you for reading and helping out.

Greetings,
OneLeafAutumn

2

The SCT 013 030 (data sheet) outputs an AC voltage, 0-1 V, across an internal burden resistor.

If you are using a standard Arduino, read the CT output using an analog input. You will have to bias the sensor output (make it positive) as described here, but leave out the burden resistor in that circuit.

3

I got the SCT 013 030 working and calibrated but when it comes to SCT 013 000 everytime I disconnected it from the Arduino, once I reupload na codes, it seems to be not calibrated again even if I didn't change anything from the codes. Sorry if I explained it poorly :frowning:

4

Hi,
Welcome to the forum.

Is this thread connected to this?
https://forum.arduino.cc/index.php?topic=642435.0

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Thanks.. Tom.. :slight_smile:

5

TomGeorge:
Hi,
Welcome to the forum.

Is this thread connected to this?
Applying multiple but same sensors - Programming Questions - Arduino Forum

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Thanks.. Tom.. :slight_smile:

Somehow, yes. I got it working for the three sensors however I'm now stuck at calibrating the output, which is my main question this time. (Or I shouldn't have posted another thread and should have continued in that thread?)

I based my circuit here How to Build an Arduino Energy Monitor - Measuring Mains Current Only — OpenEnergyMonitor 0.0.1 documentation and the modification I've made was just simply copying the same circuit three times for three sensors but analog pins at A1, A2, and A3. They share the same Vcc +5 and ground.