Hall Effect Sensor with Arduino

Difficulty
Moderate
Steps
8

A Hall Effect Sensor detects the presence of a magnetic field and varies its output in reaction to it.

In this guide, you will learn to hook up an Analog Hall Effect Sensor with the 100% Arduino compatible development board, Little Bird Uno R3.

Once you've completed this guide, you will understand how to use a hall effect sensor. You could use it to make a speedometer or a burglar alarm!

Step 1  Connect the Hall Effect Sensor to Pin 10.

  • Connect the Hall Effect Sensor to Pin 10.

Step 2  Connect the Hall Effect Sensor to 5V.

  • Connect the Hall Effect Sensor to 5V.

Step 3  Connect the Hall Effect Sensor to Ground.

  • Connect the Hall Effect Sensor to Ground.

Step 4  Insert LED into Breadboard.

  • Insert LED into Breadboard with the Cathode (short leg) on the left hand side.

Step 5  Insert 220 Ohm Resistor into the Breadboard.

  • Insert 220 Ohm Resistor into the Breadboard.
  • Ensure that it is inline with the LED's anode (longer leg).

Step 6  Connect LED to Ground.

  • Connect the Cathode of the LED to Ground.

Step 7  Connect 220 Ohm Resistor to Digital Pin 13.

  • Connect 220 Ohm Resistor to Digital Pin 13.

Step 8  Upload the code.


              int led = 13;//LED pin
int sensor = 10; //sensor pin
int val; //numeric variable

void setup()
{
  pinMode(led, OUTPUT);
  pinMode(sensor, INPUT); //set sensor pin as input
}

void loop()
{
  val = digitalRead(sensor); //Read the sensor
  if(val == HIGH) //when magnetic field is detected, turn led on
  {
    digitalWrite(led, HIGH);
  }
  else
  {
    digitalWrite(led, LOW);
  }
}
            
  • Upload this code to your Arduino.
  • When you pass a magnet over the sensor the LED on Pin 13 should turn on. Also a red light switches on the sensor.