SCT-013 Current Measuring with ESP8266

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This pcb uses an op amp to interface the SCT-013 current transformer with an ESP8266 on a WeMos D1 Mini module.
Using a "TrueRMS" Arduino library, current can be monitored and tasks performed based on the measurements.
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Опубликовано:

23 авг 2022

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Комментарии : 12

@pileofstuff Год назад

I've got a couple of those transformers on order. Thanks for doing a lot of the software groundwork - you've made my future project a lot easier.

@BRUXXUS Год назад

Very cool project. I can see this being quite useful to monitor installed projects remotely.

@ianianian436 Год назад

looks like you have already so thankyou

@felipetomaz1843 Год назад

Could it be used with Tasmota? So that you could have wifi control and integration with some home automation system.

@TheEmbeddedHobbyist Год назад

You might want to put some protection diodes on the input to stop spikes going above and below the supply. Also maybe a zener diode and buffer amp to remove any supply changes affecting the virtual ground reference. Remember if output of the current transformer goes open circuit you can get some very high voltages. Also I think I'd go for an external adc as the esp8266 adc is 1V full-scale. So not taking in to account any offsets your measurement range is 10A/1V. (+/- 5A)

@ianianian436 Год назад

are you able to provide a sketch of those improvements, components values etc

@Yranax 9 месяцев назад

you should have placed the follower BEHIND the R5, so that your impedance stays low for the ADC

@ianianian436 Год назад

thanks for Interesting project you have achieved . I would like to try it to control things. Will you be sharing the code you used? regards

@sharvarimedhe4097 Год назад

The output of the CT is RMS value of Voltage or Instantaneous Value of Voltage??

@GadgetReboot Год назад

it is instantaneous, there’s no signal processing in the device it’s just a transformer so the RMS has to be calculated by monitoring several cycles after it’s read by ADC.

@zitouniabdelkader8868 Год назад

What is the value of C3

@GadgetReboot Год назад

It's just a non installed part footprint to give an option to limit op amp bandwidth (reduce high frequency noise) in case problems showed up in testing but I never used it.