current sensor ACS712

[Manoj Ramamoorthy]

how to calculate the current value using ACS712 20Amp current sensor

 

[Golden Electronics]

how to calculate the current value using ACS712 20Amp current sensor

refer Datasheet of current sensor & connect burden accordingly then see result. For more details mention ur application

 

[mathespbe]

just connect the V1out pin to your controller's ADC pins and configure uC to read the analog value. Now you 'll get a hex value in your ADC result register...
Calculate the known values hex values, from known values find unknown values by code...

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how to calculate the current value using ACS712 20Amp current sensor

If you need further details post the controller you are using and the application needed in detail...

 

[Manoj Ramamoorthy]

my application is to measure the current flowing to the 230V 50Hz 60 wats motor.
i refereed the data sheet and i found that the output of the current sensor and multimeter is different.

i am using atmega32

 

[mathespbe]

my application is to measure the current flowing to the 230V 50Hz 60 wats motor.
i refereed the data sheet and i found that the output of the current sensor and multimeter is different.

i am using atmega32

How do you measure the O/P of the sensor? Do you have ADC code? If you have post that too...

 

[Manoj Ramamoorthy]

i measured the output through multimeter.

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the output of the sensor is 2.89V and the actual motor current measured by using multimeter is .15A

 

[paulfjujo]

hello,

i am interrsting by this subject, but not yet started to work on it...

measure-offset:
2,89-2,50= 0,390V
sensivity : 100mV/A so gives 3,9A (maybe true for DC current) ?
instead of 0,15A AC efficace value ?

did you check ACS712 output with a scope ?


it seems the rule is not the same for AC current as DC current.
see datasheet page 12
Application 4. Rectified Output. 3.3 V scaling and rectification application
for A-to-D converters. Replaces current transformer solutions with simpler
ACS circuit. C1 is a function of the load resistance and filtering desired.
R1 can be omitted if the full range is desired

use of a perfect rectifier with an AOP could be the good solution to get "DC efficace value" to the ADC input.

please confirm :
what is you power supply voltage for the ACS712 ?
what is the output measurment at 0 amps ?
shape of output ACS712?