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Hall Effect Sensor (Magnetic Field) | NexaLearn IoT Lab | NexaLearn

Sensors15 دقيقة

Hall Effect Sensor (Magnetic Field)

Measuring speed and magnetic fields.

Lesson Content

The Hall effect sensor detects the presence of a magnet or measures its analog strength. It is widely used in factories to count motor rotation speed (by placing a magnet on a wheel facing the sensor to give one pulse per revolution), and as a mechanically non-wearing alternative to limit switches.

Components Needed

Arduino UnoHall Effect Sensor (Analog/Digital)مغناطيس صغير

Wiring Notes

VCC, GND, and digital/analog output.

Code Example

const int hallPin = 2;
void setup() {
  Serial.begin(9600);
  pinMode(hallPin, INPUT);
}
void loop() {
  if(digitalRead(hallPin) == LOW) {
    Serial.println("Magnet Detected!");
  }
  delay(100);
}

Common Mistakes

Approaching the sensor with the wrong magnetic pole — most Hall sensors are sensitive to only one pole (either South or North).

Next Lesson

Real Time Clock (RTC DS3231)