Other Arduino Codes and Videos by Robojax

How to use Allegro ACS758 Current Sensor with Arduino for 50A to 200A Robojax.com

Allegro ACS758 Current Sensor with Arduino

This code is to measure current using Allegro ACS758 Current Sensor.

Allegro ACS758 Current Sensor works with AC and DC current

Advanced Arduino Code for Allegro ACS758 Current Sensor


  
/*
 * 
 * Arduino Sketch for Allegro ACS758 Current Sensor (Advanced)
 * this sensor can measure current at range of up to 200A
 * It operates with 3.3 or 5V
 * Please watch video instruction and explanation for this code.
 * 
 * Written by Ahmad Shamshiri on Saturday May 27,2018 at 13:19 at Ajax, Ontario, Canada
 * for Robojax.com
 * View the video instruction at
 * This code has been downloaded from Robojax.com
 */
#define VIN A0 // define the Arduino pin A0 as voltage input (V in)
const float VCC   = 5.0;// supply voltage 5V or 3.3V. If using PCB, set to 5V only.
const int model = 2;   // enter the model (see below)

float cutOffLimit = 1.00;// reading cutt off current. 1.00 is 1 Amper

/*
          "ACS758LCB-050B",// for model use 0
          "ACS758LCB-050U",// for model use 1
          "ACS758LCB-100B",// for model use 2
          "ACS758LCB-100U",// for model use 3
          "ACS758KCB-150B",// for model use 4
          "ACS758KCB-150U",// for model use 5
          "ACS758ECB-200B",// for model use 6
          "ACS758ECB-200U"// for model use  7   
sensitivity array is holding the sensitivy of the  ACS758
current sensors. Do not change.          
*/
float sensitivity[] ={
          40.0,// for ACS758LCB-050B
          60.0,// for ACS758LCB-050U
          20.0,// for ACS758LCB-100B
          40.0,// for ACS758LCB-100U
          13.3,// for ACS758KCB-150B
          16.7,// for ACS758KCB-150U
          10.0,// for ACS758ECB-200B
          20.0,// for ACS758ECB-200U     
         }; 

/*         
 *   quiescent Output voltage is factor for VCC that appears at output       
 *   when the current is zero. 
 *   for Bidirectional sensor it is 0.5 x VCC
 *   for Unidirectional sensor it is 0.12 x VCC
 *   for model ACS758LCB-050B, the B at the end represents Bidirectional (polarity doesn't matter)
 *   for model ACS758LCB-100U, the U at the end represents Unidirectional (polarity must match)
 *    Do not change.
 */
float quiescent_Output_voltage [] ={
          0.5,// for ACS758LCB-050B
          0.12,// for ACS758LCB-050U
          0.5,// for ACS758LCB-100B
          0.12,// for ACS758LCB-100U
          0.5,// for ACS758KCB-150B
          0.12,// for ACS758KCB-150U
          0.5,// for ACS758ECB-200B
          0.12,// for ACS758ECB-200U            
          };
const float FACTOR = sensitivity[model]/1000;// set sensitivity for selected model
const float QOV =   quiescent_Output_voltage [model] * VCC;// set quiescent Output voltage for selected model
float voltage;// internal variable for voltage
float cutOff = FACTOR/cutOffLimit;// convert current cut off to mV

void setup() {
    //Robojax.com ACS758 Current Sensor 
    Serial.begin(9600);// initialize serial monitor
    Serial.println("Robojax Tutorial");
    Serial.println("ACS758 Current Sensor");
}

void loop() {
  //Robojax.com ACS758 Current Sensor 
  float voltage_raw =   (5.0 / 1023.0)* analogRead(VIN);// Read the voltage from sensor
  voltage =  voltage_raw - QOV + 0.007 ;// 0.007 is a value to make voltage zero when there is no current
  float current = voltage / FACTOR;
  if(abs(voltage) > cutOff ){
    Serial.print("V: ");
    Serial.print(voltage,3);// print voltage with 3 decimal places
    Serial.print("V, I: ");
    Serial.print(current,2); // print the current with 2 decimal places
    Serial.println("A");
  }else{
    Serial.println("No Current");
  }
  delay(500);
}
   

Advanced Arduino Code for Allegro ACS758 Current Sensor (Basic)

This is Basic code to measure current using Allegro ACS758 Current Sensor . See video for details.


  

/*
 * Arduino Sketch for Allegro ACS758 Current Sensor (Basic Simple)
 * this sensor can measure current at range of up to 200A
 * It operates with 3.3 or 5V (the module works with 5V, sensor can work with 3.3 or 5V)
 * Please watch video instruction and explanation for this code.
 * 
 * Written by Ahmad Shamshiri on Saturday May 26,2018 at 19:05 at Ajax, Ontario, Canada
 * for Robojax.com
 * View the video instruction at https://youtu.be/SiHfjzcqnU4
 * This code has been downloaded from Robojax.com
 */
#define VIN A0
const float vcc    = 5.00;// supply voltage 5V or 3.3V
const float factor = 0.02;// 20mV/A is the factor

float voltage;

void setup() {
    //Robojax.com ACS758 Current Sensor 
    Serial.begin(9600);
    Serial.println("Robojax Tutorial");
    Serial.println("ACS758 Current Tester");
    Serial.println("Basic Simple Code");
}

void loop() {
  //Robojax.com ACS758 Current Sensor 
  voltage =   (5.0 / 1023.0)* analogRead(VIN);// Read the voltage from sensor
  voltage =  voltage - (vcc * 0.5) + 0.007 ;// 0.007 is a value to make voltage zero when there is no current
  float current = voltage / factor;
  Serial.print("V: ");
  Serial.print(voltage,3);
  Serial.print("V, I: ");
  Serial.print(current,2); Serial.println("A");
  delay(500);
}