How to use Allegro ACS758 Current Sensor with Arduino for 50A to 200A
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);
}
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);
}
Advanced Arduino Code for 4 pieces of Allegro ACS758 Current Sensor
This code has not been tested but it should work.
/*
*
* Arduino Sketch for 4 modules 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 August 04,2018 at 13:19 in Ajax, Ontario, Canada
* for Robojax.com in request from Ross M. from youTube video https://youtu.be/SiHfjzcqnU4
* View the video instruction at
* This code has been downloaded from Robojax.com
*/
#define VIN1 A0 // define the Arduino pin A0 as voltage input (V in)
#define VIN2 A1
#define VIN3 A2
#define VIN4 A3
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 voltage1;// internal variable for voltage1
float voltage2;// internal variable for voltage2
float voltage3// internal variable for voltage3
float voltage4;// internal variable for voltage4
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("Four ACS758 Current Sensors");
}
void loop() {
//Robojax.com ACS758 Current Sensor
float voltage_raw1 = (5.0 / 1023.0)* analogRead(VIN1);// Read the voltage from sensor
float voltage_raw2 = (5.0 / 1023.0)* analogRead(VIN2);// Read the voltage from sensor
float voltage_raw3 = (5.0 / 1023.0)* analogRead(VIN3);// Read the voltage from sensor
float voltage_raw4 = (5.0 / 1023.0)* analogRead(VIN4);// Read the voltage from sensor
voltage1 = voltage_raw1 - QOV + 0.007 ;// 0.007 is a value to make voltage zero when there is no current
voltage2 = voltage_raw2 - QOV + 0.007 ;// 0.007 is a value to make voltage zero when there is no current
voltage3 = voltage_raw3 - QOV + 0.007 ;// 0.007 is a value to make voltage zero when there is no current
voltage4 = voltage_raw4 - QOV + 0.007 ;// 0.007 is a value to make voltage zero when there is no current
float current1 = voltage1 / FACTOR;
float current2 = voltage2 / FACTOR;
float current3 = voltage3 / FACTOR;
float current4 = voltage4 / FACTOR;
if(abs(voltage) > cutOff ){
Serial.print("I1: ");
Serial.print(current1,2); // print the current with 2 decimal places
Serial.println("A");
Serial.print("I2: ");
Serial.print(current2,2); // print the current with 2 decimal places
Serial.println("A");
Serial.print("I3: ");
Serial.print(current3,2); // print the current with 2 decimal places
Serial.println("A");
Serial.print("I4: ");
Serial.print(current4,2); // print the current with 2 decimal places
Serial.println("A");
}else{
Serial.println("No Current");
}
delay(500);
}