KY-024 Hall Effect Magnetic Sensor Module

Description

KY-024 Hall Effect Magnetic Sensor Module

The KY-024 is a magnetic-field detection module built around an integrated 49E linear Hall-effect sensor. It provides both analog and digital outputs, making it suitable for applications such as proximity detection and magnetic-field measurement.

Detailed specifications

• Operating voltage: 3–5 V DC
• Detection range: ±2 mT
• Operating temperature: −40°C to +85°C
• Sensitivity: 1.0 mV/G minimum, 1.4 mV/G typical, 1.75 mV/G maximum
• Dimensions: 45 × 15 × 14 mm
• Weight: 1 g
• Main components: 49E linear Hall sensor, LM393 comparator, potentiometer, LED and resistors

How it works

The KY-024 detects magnetic fields and generates an analog voltage proportional to field strength. Its integrated comparator can provide a digital output when the magnetic field exceeds a threshold adjusted with the potentiometer.

Applications

• Position and speed detection in robotics
• Proximity detection in security systems
• Metal-object detection in industrial applications
• Current measurement in power supplies
• Magnetic-field mapping and measurement in scientific research

Pinout

The KY-024 module has four pins:

1. VCC: Power supply (3–5 V)
2. GND: Ground
3. A0: Analog output
4. D0: Digital output

How to use it

Connect the module as follows:

1. VCC to 5 V on the Arduino
2. GND to GND on the Arduino
3. A0 to A0 on the Arduino to read analog values
4. D0 to a digital pin (for example, D3) to read digital values

Using it with an Arduino Uno

Basic Arduino code example

const int led = 13; // LED sur l'Arduino
const int digitalPin = 3; // Interface numérique du capteur Hall
const int analogPin = A0; // Interface analogique du capteur Hall
int digitalVal; // Valeurs numériques
int analogVal; // Valeurs analogiques


void setup() {
  pinMode(led, OUTPUT);
  pinMode(digitalPin, INPUT);
  Serial.begin(9600);
}


void loop() {
  // Lecture de l'interface numérique
  digitalVal = digitalRead(digitalPin);
  if (digitalVal == HIGH) {
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }


  // Lecture de l'interface analogique
  analogVal = analogRead(analogPin);
  Serial.println(analogVal);
  delay(100);
}

What the code does: It reads the KY-024 analog and digital outputs and turns on the Arduino LED when a magnetic field is detected.

Components required for the basic example

• Arduino Uno
• KY-024 module
• Connecting wires

Basic code explained

1. Pin initialization: The LED pin is set as an output and the sensor pins as inputs.
2. Reading and displaying data: The analog and digital values are read and displayed in the serial monitor. The LED turns on when a magnetic field is detected.

Basic wiring

• VCC (KY-024): 5 V (Arduino)
• GND (KY-024): GND (Arduino)
• A0 (KY-024): A0 (Arduino)
• D0 (KY-024): D3 (Arduino)

Advanced Arduino code example

#include <Wire.h>
#include <LiquidCrystal_I2C.h>


LiquidCrystal_I2C lcd(0x27, 16, 2);
const int led = 13;
const int digitalPin = 3;
const int analogPin = A0;
int digitalVal;
int analogVal;


void setup() {
  lcd.begin();
  lcd.backlight();
  pinMode(led, OUTPUT);
  pinMode(digitalPin, INPUT);
  Serial.begin(9600);
}


void loop() {
  // Lecture de l'interface numérique
  digitalVal = digitalRead(digitalPin);
  if (digitalVal == HIGH) {
    digitalWrite(led, HIGH);
    lcd.setCursor(0, 0);
    lcd.print("Magnetic: YES ");
  } else {
    digitalWrite(led, LOW);
    lcd.setCursor(0, 0);
    lcd.print("Magnetic: NO  ");
  }


  // Lecture de l'interface analogique
  analogVal = analogRead(analogPin);
  lcd.setCursor(0, 1);
  lcd.print("Analog: ");
  lcd.print(analogVal);
  delay(100);
}

What the code does: It reads the KY-024 analog and digital outputs, displays them on an I2C LCD, and controls the Arduino LED.

Components required for the advanced example

• Arduino Uno
• KY-024 module
• 1602 I2C LCD
• Connecting wires

Advanced code explained

1. Including libraries: #include <Wire.h> and #include <LiquidCrystal_I2C.h> add the libraries required for the LCD.
2. Initialization: Communication with the LCD and sensor is set up in setup().
3. Reading and displaying data: The analog and digital values are read and shown on the LCD. The LED turns on when a magnetic field is detected.

Advanced wiring

• VCC (KY-024): 5 V (Arduino)
• GND (KY-024): GND (Arduino)
• A0 (KY-024): A0 (Arduino)
• D0 (KY-024): D3 (Arduino)
• VCC (LCD): 5 V (Arduino)
• GND (LCD): GND (Arduino)
• SCL (LCD): A5 (Arduino)
• SDA (LCD): A4 (Arduino)

Installing the driver/library

To use the KY-024 module and LCD with Arduino, install the LiquidCrystal I2C library through the Arduino IDE:

1. Open the Arduino IDE: Make sure it is up to date.
2. Open the Library Manager: From the menu, choose Sketch → Include Library → Manage Libraries.
3. Search for “LiquidCrystal I2C”: Use the search box to find the library.
4. Install the library: Click Install to add it to the IDE.

 Keywords: Hall effect, magnetic, sensor.