Detect Magnetic Field with Hall Effect Sensor

Objective

Learn how to use a Hall Effect sensor to detect the presence of a magnetic field and display the results using Arduino.

Required Components

• Hall Effect Sensor
• Arduino Board (e.g., Arduino Uno)
• Jumper wires
• Breadboard
• Arduino IDE (for programming)

Working Principle

The Hall Effect sensor produces an output voltage when exposed to a magnetic field, enabling detection and measurement of the field's presence.

Circuit Diagram

Arduino Code

const int hallPin = 2;  // Hall Effect sensor connected to digital pin 2
int hallState = 0;

void setup() {
    Serial.begin(9600);  // Initialize serial communication
    pinMode(hallPin, INPUT);  // Set the Hall Effect sensor pin as input
}

void loop() {
    hallState = digitalRead(hallPin);  // Read the sensor state

    if (hallState == HIGH) {
        Serial.println("Magnetic Field Detected!");
    } else {
        Serial.println("No Magnetic Field.");
    }

    delay(1000);  // Wait for 1 second before the next reading
}
            

Results

The Arduino serial monitor will display either "Magnetic Field Detected!" or "No Magnetic Field," depending on the sensor's state.

Applications

• Magnetic field detection
• Position sensing
• Speed measurement in motors

Conclusion

Hall Effect sensors are highly useful for detecting and measuring magnetic fields in a wide range of applications.