Hello, I am trying to read current through my load. Basically I have a buck converter with a P channel mosfet. This mosfet is controlled by a high switching opto coupler. This optocoupler is attached to the arduino. Arduino is being controlled through labview. I have everything done ( circuit built, everything talking to one another, voltage at my output through a voltage divider, etc.) aLl I would like to do is measure current at my load. i have a allegro acs 712. I already calibrated it, (meaning did the linear fit equation), but cant get it to read across my load. I put Ip+ to through one end of my load and Ip- to the other end which goes to ground. the 5v pin on the sensor goes to 5 v on the arduino. Ground goes to ground. Vo on the sensor goes to my analog port 5 on my arduino. I am simply trying to read the current, but I am only get 5 volts at my graph. So i am picking up a voltage but its from the arduino and not my load. Do I need to convert this voltage through the linear fit equation I did for the sensor in order to have it convert to current?? has anyone does this sort of example before? I can send code if someone wants. Thanks so much paul

LabVIEW

A quick thought. ( i have not read all posts, with no time)

Consider using a separate 5v source for the power until you are sure it works.

Most Arduino 5v regulators may not be sufficient beyond a certain level of loading..

Hope it helps.

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