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ACS718 Current sensor interfacing with ARM LPC1768 Issue

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satiz

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Hi All,

I am planning to measure AC load current using ACS718. The output of ACS718 is sine with 2.5 volt positive offset. My microcontroller ADC positive reference is 3.3V. I am facing difficulty in reading the ACS718 output using microcontroller.

Please help me to solve this issue.

My circuit is attached below

acs718 ISSUE.png

OUTPUT

IMG_20160723_114612.jpg

IMG_20160723_192524.jpg
 

Hi,

Center voltage of the sensor is 2.5V
Center voltage of ADC range is 3.3V/2 = 1.65V

--> use a voltage divider: input 2.5V, output 1.65V.

For sure the "current signal" is attenuated with the same factor.

Klaus
 

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