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Current Transformer with Arduino

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  • Current Transformer with Arduino

    Hi,
    I have CT with below specs:
    Primary Current: 100A, Turns ratio: 2500:1.
    Solid core and PCB Mountable type.
    Link: https://www.electrohms.com/product-ct1273-a1-rc

    I'm trying to measure 60W Bulb current consumption using arduino.
    I have followed this reference example:
    https://learn.openenergymonitor.org/...e-with-arduino
    with the burden value of 42 Ohms since in my case, for 100A input primary CT will generate a secondary of 40mA.

    I tried to run the code. But I'm returning with a random value when bulb is off, current is showing 2.02 and when I turned bulb on it shows 1.85.
    Could any one please help me with what I'm doing here?
    I've used the same code.

  • #2
    Did you try to connect oscilloscope the aurduino pin? What is the waveform like?

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    • #3
      Originally posted by robertferanec View Post
      Did you try to connect oscilloscope the aurduino pin? What is the waveform like?
      No, We don't have access to Oscilloscope here.

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      • #4
        Hmm ... it may be quite difficult to debug the problem without a scope. You may need to see the waveforms on arduino pin.

        How do you calculate the values what you show?

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