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Measuring 5A to 30A AC and DC current using ACS712 with Robojax Library

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Measuring AC and DC current using ACS712 with Robojax Library

Learn how to use ACS712 5A, 20A and 30A Hall Effect Current Sensor to measure AC and DC current. Measuring 5A and 30A DC and 840W AC load current is demonstrated. To use more 2 or more senensors, please see This page.

Topics covered in this video

Resources for this sketch

 * Arduino Sketch for Allegro ACS712 Current Sensor 
 * this sensor is offered at 5A, 20A and 30A range for AC and DC
 * It operates with 5V
 * Please watch video instruction and explanation for this code
 YouTube video: https://youtu.be/3C33DpcSwIw
00:51 Introduction
01:31 Hardware Explained
02:20 Datasheet Viewed
05:55 Wiring Explained
07:37 5A module demonstration
09:48 30A module demonstration
12:18 AC current measurement
14:46 Conclusion remarks
 * Written by Ahmad Shamshiri on Saturday Mar 14, 2020 at 16:15 in Ajax, Ontario, Canada
 * for Robojax.com
 * View the video :
 * This code has been downloaded from Robojax.com
model select
      3,// for ACS758LCB-050B
      4,// for ACS758LCB-050U
      5,// for ACS758LCB-100B
      6,// for ACS758LCB-100U
      7,// for ACS758KCB-150B
      8,// for ACS758KCB-150U
      9,// for ACS758ECB-200B
      10,// for ACS758ECB-200U 
      11,// for ACS770x-050B ///      
      12,// for ACS770x-050U  
      13,// for ACS770x-100B
      14,// for ACS770x-100U
      15,// for ACS770x-150B
      16,// for ACS770x-150U
      17,// for ACS770x-200B  
      18,// for ACS770x-200U  

      19 for "ACS732KLATR-20AB",
      20 for "ACS732KLATR-40AB",
      21 for "ACS732KLATR-65AB", 
      22 for "ACS732KLATR-65AU",   
      23 for "ACS732KLATR-75AB", 

      24 for "ACS733KLATR-20AB",
      25 for "ACS733KLATR-40AB",
      26 for "ACS733KLATR-40AU", 
      27 for "ACS733KLATR-65AU",

 * this code has been downloaded from http://robojax.com/learn/arduino/
 * Get this code and other Arduino codes from Robojax.com
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 *  * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

const int VIN = A0; // define the Arduino pin A0 as voltage input (V in)
const float VCC   = 5.04;// supply voltage
const int MODEL = 0;   // enter the model (see above list)
#include <Robojax_AllegroACS_Current_Sensor.h>

Robojax_AllegroACS_Current_Sensor robojax(MODEL,VIN);

void setup() {
    //Robojax.com Allegro ACS Current Sensor 
    Serial.begin(9600);// initialize serial monitor
    Serial.println("Robojax Tutorial");
    Serial.println("ACS770 Current Sensor");

void loop() {
   //Robojax.com Allegro ACS Current Sensor  

    Serial.print("Current: ");
    Serial.print(robojax.getCurrent(),3); // print the current with 3 decimal places
    Serial.print("A Avg:");

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