Other Arduino Codes and Videos by Robojax
This code is to measure current using Allegro ACS758 Current Sensor and display it on LCD1602
In order to use this code, you must watch the following two videos and get required library and codes
/*
*
* Arduino Sketch for Allegro ACS758 Current Sensor with LCD1602
* this sensor can measure current at range of up to 200A
* It operates with 3.3 or 5V
* This video requires you to watch the following 2 videos before using this code:
* 1- ACS758 Sensor https://www.youtube.com/watch?v=SiHfjzcqnU4
* 2- LCD1602 Display https://www.youtube.com/watch?v=S4ya3Q7uhJs
*
*
* Written by Ahmad Shamshiri on Tuesday June 22,2018 at 17:57 at Ajax, Ontario, Canada
* for Robojax.com
* View the video instruction for this code at https://youtu.be/Co-DrCa2slk
* 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
//************ END of ACS785 Settings
//******************** Start of LCD1602
// Jan 21, 2018 14:25
// original source https://www.arduino.cc/en/Tutorial/HelloWorld
// include the library code:
#include <LiquidCrystal.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
// Robojax.com ACS758 Current Sensor with LCD1602
Serial.begin(9600);// initialize serial monitor
Serial.println("Robojax Tutorial");
Serial.println("ACS758 Current Sensor");
Serial.println("with LCD1602 display");
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.clear();
lcd.print("Robojax");
lcd.setCursor (0,1); // go to start of 2nd line
lcd.print("ACS758 Current Sensor");
delay(2000);
lcd.clear();
}
void loop() {
// Robojax.com ACS758 Current Sensor with LCD1602
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");
//start of loop Robojax code ACS758 with LCD1602 and I2C
lcd.clear();
lcd.setCursor (0,0); // set to line 1, char 0
lcd.print("Current: ");
lcd.setCursor (9,0); // go to start of 2nd line
lcd.print(current);
lcd.setCursor (15,0); // go to start of 2nd line
lcd.print("A");
lcd.setCursor (0,1);
lcd.print("Sense V: ");
lcd.setCursor (9,1); // go to start of 2nd line
lcd.print(voltage);
lcd.setCursor (15,1); // go to start of 2nd line
lcd.print("V");
//end of loopcode Robojax code ACS758 with LCD1602 and I2C
}else{
Serial.println("No Current");
lcd.clear();
lcd.setCursor (0,0);
lcd.print("No Current");
}
delay(500);
// Robojax.com ACS758 Current Sensor with LCD1602
} 
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