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  • JoeN104 commented on seasider1960's instructable Laundry Room Monitor1 year ago
    Laundry Room Monitor

    Thanks for getting back to me! I hacked an extension cord with the back, green and white wires exposed so I can insert this and easily test with a variety of loads. Even when this is disconnected it was reading as if current was flowing. I borrowed a clamp meter from a neighbor who is an electrician and spoke to him a little. He thinks one possibility could be variations coming from the power supply I am using to power the ESP8266. Since the sensor circuit is using the voltage from the ESP as a reference, he thinks the power supply could be fluctuating and causing the reference voltage to vary causing the spikes and higher than expected readings. I also found a discussion on the energymon site that spoke about using a value of X=60 in the calibration parameter for the emon.curren...

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    Thanks for getting back to me! I hacked an extension cord with the back, green and white wires exposed so I can insert this and easily test with a variety of loads. Even when this is disconnected it was reading as if current was flowing. I borrowed a clamp meter from a neighbor who is an electrician and spoke to him a little. He thinks one possibility could be variations coming from the power supply I am using to power the ESP8266. Since the sensor circuit is using the voltage from the ESP as a reference, he thinks the power supply could be fluctuating and causing the reference voltage to vary causing the spikes and higher than expected readings. I also found a discussion on the energymon site that spoke about using a value of X=60 in the calibration parameter for the emon.current(A1, X) function called in setup (that person was using a 60A SCT013-060 CT). I'm using a SCT103-030 so I changed the calibration value from 111.1 to 30 and the values reported started to get much closer to what the clamp meter is reading. I powered my rig with the USB from the computer for a while and the readings with no load were not zero, but were much closer and more consistent to what I was expecting (0.02, 0.03 etc) so I'm going to try with another power supply and see what happens. I also do see the first 3-5 readings are strange so I plan to throw those away too. Very cool project you did here - thanks for doing all the big thinking on this!

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  • JoeN104 commented on seasider1960's instructable Laundry Room Monitor1 year ago
    Laundry Room Monitor

    When I am measuring the current using the SCT013-030, when the washer is off, I sometimes still getting current readings similar to what is seen when the washer is filling. e.g. Off I sometimes get 0.02, 0.2, 0.19; Other times I get .69, .51, .78 which are similar to the fill stage.Anyone have any ideas? I'm using a ESP8266 instead of an Arduino, The ESP is 3.3V so I'm using 2x10K resistors in the voltage divider. The ESP's power supply is plugged into the same outlet as the washer, but the CT is around the hot wire of the washer's power cable. Could it be noise form the power pack? Or is my Voltage divider not correct so its not accurate enough?

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