Hall Effect Magnetic and Proximity Sensor Module Quickstart Guide

The Hall Effect Magnetic and Proximity Sensor Module can be used to detect the presence (or absence!) of nearby objects such as magnets.

Module Pinout

GND: Connect to GND (0V) on your microcontroller.

OUTPUT: Active LOW. Normally HIGH, goes LOW in the presence of a magnetic field. Connect to a digital I/O pin on your microcontroller.

VIN: Connect to 5V on your microcontroller.

Basic Usage

The module includes a "TRIGGERED" LED which illuminates when the output is active. To verify operation of the module all you need to connect is GND and 5V, and observe the LED when a magnet is brought near the module.

To detect the state of the output connect the module to an Arduino as shown below. In this example we used Arduino digital I/O pin D12.

The example sketch below reads the state of the module output, and illuminates the LED connected to pin D13 (included on the PCB of most Arduino models) when a magnetic field is detected. Remember that the module output is active LOW, so we check for a LOW reading to determine if the LED should be illuminated.

const int sensorPin = 12;
const int ledPin = 13;

int sensorState = 0;

void setup() {
  pinMode(ledPin, OUTPUT);      
  pinMode(sensorPin, INPUT);     
}

void loop(){
  sensorState = digitalRead(sensorPin);

  if (sensorState == LOW) {        
    digitalWrite(ledPin, HIGH); // Turn on LED
  } 
  else {
    digitalWrite(ledPin, LOW);  // Turn off LED
  }
}

Copy and paste the sketch above into the Arduino IDE, upload it to your Arduino with the module connected as shown above, and bring a magnet near the module. Observe that the D13 LED on the Arduino illuminates when a magnetic field is present, and extinguishes when it is absent.