Hello I am looking for a simple circuit that is capable of converting AC current that's about 1A into DC to measure it through the INA219 sensor. I was thinking of using a bridge rectifier with a filtering capacitor, but I am not sure what would the effect of using this topology be on the circuit …

For a 50-60Hz sinewave: Read the ADC as fast as you can for 25ms and find the peak value. Subtract the offset from the peak value (should be around 512). Find 10 peak values and take the average. Multiply the peak by 0.7071 to get the RMS value. Code something like this: int peak_vals[10]; unsign…

[image] EmilyJane: I think it's the ACS724LLCTR-2P5 I'm going crazy, don't know what I was looking at

[image] jim-p: I'm going crazy This thread will do that to you. :rofl:

Thank you guys.. I will go with the AD8418 circuit mentioned, and I will report ASAP.......

Make sure the AC source stays within the common mode range of the AD8418 (INA196). Those two chips need an external A/D, so maybe worse than an INA226, which can be used if the shunt has a common ground with the AC source. Still don't know what you're measuring. Leo..

Can you please elaborate on " AC source stays within the common mode range"? I am measuring the AC RMS current value on an experimentation PCB that is sinewave and up to 1A and 1kHz..

[image] shamooooot: Can you please elaborate on " AC source stays within the common mode range"? It means that the voltage on the inputs of the chip must stay within a certain boundary. Those boundaries are given in the datasheet of the chip. For an INA219 for example that is between 0volt …

Hello guys I have made the circuit proposed by Jim, and I would appreciate if I get some guidance to calculate the RMS current value.. Here's the result for around 70mA AC current: [image] Here is the output for OC current: [image] // ATmega32 ADC Read on PA2 (ADC Channel 2) and Output to Se…

[image] shamooooot: I have made the circuit proposed by Jim, and I would appreciate if I get some guidance to calculate the RMS current value.. Quote from post #12: [image] John, from Lincoln: You would need to take multiple measurements throughout (at least) one mains cycle, and calcula…

Thank you very much that was very beneficial. I have tried 115200, and 74880 but with both rates I couldn't read any data, then I change to 57600 and changed delay to 10ms. Here is the acquired data for around 100mA: [image] // ATmega32 ADC Read on PA2 (ADC Channel 2) and Output to Serial Plott…

A simple circuit to measure AC current using INA219

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A simple circuit to measure AC current using INA219

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