Interfacing Of Current Sensor

Hello Friends, 
I am cyberautics and in this session we learn about the How to interface current sensor and How to work with Current sensor(ACS712), In the earlier session we learn about the interfacing of voltage Sensor if you still not read that blog than click here.

BASICS OF CURRENT SENSOR(ACS712)

• If you recall the previous Arduino project, We have discussed about measuring voltage with Arduino using a Voltage Sensor. In this project, we will learn about measuring current using a Current Sensor (ACS712).

• A Current Sensor is an important device in power calculation and management applications. It measures the current through a device or a circuit and generates an appropriate signal that is proportional to current measured. Usually, the output signal is an analog voltage.

• The ACS712 Current Sensor is a product of Allegro MicroSystems that can be used for precise measurement of both AC and DC currents. This sensor is based on Hall Effect and the IC has an integrated Hall Effect device.

• Coming to the output of the ACS712 Current Sensor, it produces an analog voltage that is proportional to AC or DC currents (whichever is being sensed).

• Pin connections : 

1 & 2 IP+ : +ve terminals for sensing current

3 & 4  IP-: -ve terminals for sensing current

5  GND : ground the signals

6 FILTER : External Capacitor (to set the bandwidth)

7  VIOUT : Analog Output

8 VCC :  Power Supply

Components

1. Arduino UNO
2. ASC712 Current Sensor Module  
3. Resistor (220 ohm)
4. Power supply 
5. PCB/Breadboard
6. Connecting wires

CIRCUIT DIAGRAM

Make a connection as per the Diagram 

CODE

const int currentPin = A0; //declare analog input pin

int sensitivity = 66; //declare + initialization of variable

int adcValue= 0;  //make a variable names adcvalue

int offsetVoltage = 2500; //declare + initialization of variable

double adcVoltage = 0;  //declare + initialization of variable

double currentValue = 0;  //declare + initialization of variable

void setup() 

{

  Serial.begin(9600);   

}

void loop()

{

  //calculaton start

  adcValue = analogRead(currentPin);

  adcVoltage = (adcValue / 1024.0) * 5000;

  currentValue = ((adcVoltage - offsetVoltage) / sensitivity);

  // calculation end 

  delay(2000);

  Serial.print("\t Current = ");

  Serial.println(currentValue); 

}

EXPLANATION

• Make the connections and upload the code to Arduino. In the code, there is a small calculation for measuring the current.

• ACS712 can be used for measuring either AC or DC currents, Arduino can be implemented to measure the same

• The ASC712 is based on Hall Effect. There is a copper strip connecting the IP+ and IP- pins internally. When some current flows through this copper conductor, a magnetic field is generated which is sensed by the Hall Effect sensor. The Hall Effect sensor then converts this magnetic field into appropriate current. In this method, the input and the output are completely isolated.

So, my dear friends I hope this blog is very useful for you if you have any doubts or any questions you can directly contact me.