Those sensors are noisy. I have even more noise than you.Those sensors pick up any magnetism from transformers nearby. Both normal 50Hz/60Hz transformers and also high frequency switching power supply transformers.I live in Europe, with 50Hz mains. So I use the average during 20ms, to measure DC current.But it still is not very stable.If you look at the Pololu breakout board, the current side copper on the pcb is near the sensor output side. For high voltages it should be as far as possible away from the sensor output side.
"Warning: This product is intended for use below 30 V. Working with higher voltages can be extremely dangerous and should only be attempted by qualified individuals with appropriate equipment and protective gear."Now I am confuse. What exactly is restricting the voltage from go over 30V? Is that an issue with the board or the IC? Cause I can't find this limitation on the data-sheet of the ACS714 IC.
retrolefty, your answer scares me.Look at the pcb, how short the distance is between the current side and the signal side of the sensor. There is even a signal line under the chip.
Anyone know if this is suitable for the mains? say 3A max @ 240v AC (UK). I had a quick skim through the datasheet, and didn't seem to find anything :/Chiel | about 3 years ago 1the ACS712 is rated to 5A and after searching around on the web for projects using this ic at 220v i would say its usable in europe. the datasheet mentions a Peak Basic isolation voltage of ~380 Volt which could be the maximum voltage the ic can handle. i hope this answers your question.mattkenny | about 3 years ago 1I'm using the 20A version of this chip in a device to sense mains current @240V/50Hz (Australia). It handles it just fine.
retrolefty, a resistor of 1.2mOhm is between pin 2 and 3. So at 30A there is 36 mV between 2 and 3.
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