# ACS 723 Current Sensor

I used an ACS 723 current sensor to measure a very small current. The output of the current sensor gets converted into a proportional voltage.

I have attached the output of the current sensor. Could somebody tell me the formula or a way to convert this voltage into current?

• The datasheet specifies something like 100~400mV/A, depends on your model. Dec 30 '20 at 15:06
• Thank you so much Dec 30 '20 at 15:35
• You are welcome. Have a great new year. Cheers. Dec 31 '20 at 1:43

For each specific module, there is a table that gives you a "Zero Current Output Voltage," and a "Sensitivity."

Subtract the zero current voltage from your measured voltage then divide by the sensitivity to get current.

Assuming a Vcc of 5V and that you are are using the "xLLCTR-5AB" model (from the example table,) then your measured current (as shown in your example) would be around $$\\frac{2.39V-2.5V} {400} = -0.275 amperes.\$$

There are more items in the datasheet that will help you get better values (expected voltage offset errors, linearity errors, etc.) but the method above will give you a starting point.