/*
*
* 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_i2c
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
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 A 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(1500);
// Robojax.com ACS758 Current Sensor with LCD1602
}