Magnetic Hall Effect Sensor

Detects magnetic fields for speed sensing and position detection

Overview

Hall Effect sensors detect magnetic fields and are commonly used for speed sensing, position detection, and proximity applications. They work by measuring the Hall voltage generated when a magnetic field is applied perpendicular to the current flow. These sensors are contactless, reliable, and perfect for applications requiring precise magnetic field detection.

Technical Specifications

Operating Voltage: 3.3V - 5V DC
Operating Current: 3-25mA
Sensitivity: 1.3mV/Gauss
Detection Range: ±1000 Gauss
Output: Analog & Digital
Response Time: < 2 µs
Operating Temperature: −40 °C to +150 °C
Package: TO-92, SOT-23

Key Features

  • Contactless magnetic field detection
  • High sensitivity and accuracy
  • Fast response time (microseconds)
  • Wide operating temperature range
  • No mechanical wear or tear
  • Immune to dust and moisture
  • Low power consumption
  • Long lifespan and reliability

Wiring Diagram

Basic Connection (Arduino Uno)

Hall Sensor Pin → Arduino Pin
VCC → 5V (or 3.3V)
GND → GND
AO (Analog) → Analog Pin A0
DO (Digital) → Digital Pin 2

Note: Use a magnet to test the sensor. Bring it close to activate the sensor output.

Common Applications

Speed Sensing

Motor RPM measurement and wheel speed detection

Position Detection

Door/window open/close status monitoring

Proximity Sensing

Contactless object detection and counting

Current Sensing

Non-invasive AC/DC current measurement

Quick Info

Difficulty: Beginner
Price Range: ₹30-100
Interface: Analog/Digital

Compatible Boards

Sample Code

#define HALL_DIGITAL 2
#define HALL_ANALOG A0
#define LED_PIN 13

void setup() {
  Serial.begin(9600);
  pinMode(HALL_DIGITAL, INPUT);
  pinMode(LED_PIN, OUTPUT);
  
  Serial.println("Hall Effect Sensor Test");
}

void loop() {
  int digitalValue = digitalRead(HALL_DIGITAL);
  int analogValue = analogRead(HALL_ANALOG);
  
  if (digitalValue == LOW) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Magnet Detected!");
  } else {
    digitalWrite(LED_PIN, LOW);
    Serial.println("No Magnet");
  }
  
  Serial.print("Magnetic Field Strength: ");
  Serial.println(analogValue);
  
  delay(500);
}