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How to read the sensor value from ACS712 Low Current Breakout

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Hi, I would like to measurethe consumption value ofthe lamp, Size100W, 220Vac (0.45A).

I have noticed that the output from the sensor IC is Vcc/2 (~2.5 V) if there is no current.

so, @0A -----> output from sensor is 2.5Vdc

 

Ifthesensoroutputislinearwith the currentinput.

      @0.45A -----> probability output from sensor is 2.725Vdc (Vo = (0.45+5)/2)

 

However, when usinga digital multi meter tomeasure Vo pin (Swith On).

Found thattheVoat2.5Vdcsame andnochange.


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