Saturday, July 29, 2017

Let you know more about ACS712 Current Sensor User Manual

ElcoHow. - This is one of the popular current sensor module for you who want to build DC or AC current measurement with best quality. This current sensor module is called with ACS712 current sensor.

In here we will give you the global description of this sensor, and then we will allow you to read more about this ACS712 Current Sensor User Manual from original source references that also published this sensor.


Henry's Bench site give us description or global overview that The ACS712 Current Sensors offered on the internet are designed to be easily used with micro controllers like the Arduino.

These sensors are based on the Allegro ACS712ELC chip. These current sensors are offered with full scale values of 5A,  20A and 30A. The basic functional operation of each of these devices is identical.  The only difference is with the scale factor at the output as detailed below.

ACS712 Module Pin Outs and Connections

Pay attention to the polarity at the load end of the device.   If you are connected as illustrated below, the output will raise.  If you connect it opposite of this picture, the output will decrease from the 2.5 volt offset.

Image Courtesy of Henry's Bench

Basic Hook Up and Functional Description

As mentioned before, these modules are primarily designed for use with micro-controllers like the Arduino.    In those applications,  the connections would be as picture below: 

Image Courtesy of Henry's Bench

If the light bulb shown in the picture above were disconnected, the output of the ACS712 module would be 2.500 volts.

Once connected, the output would be scaled to the current drawn through the bulb.   If this were a 5 Amp module and the light bulb pulled 1 Amp, the output of the module would be 2.685 volts.

Now imagine the battery polarity reversed.   Using the same 5A module, the output would be 2.315 volts. Read more here.

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