A3144E Hall Effect Sensor Module

A3144E Hall effect সেন্সর মডিউল চুম্বক (magnet) সনাক্ত করে, কোনো স্পর্শ ছাড়াই। এর একটি মাত্র ডিজিটাল আউটপুট পিন (S) আছে: চুম্বক কাছে এলে LOW, দূরে থাকলে HIGH। হুইলের ঘূর্ণন গোনা, RPM মাপা, দরজা বা ঢাকনা খোলা-বন্ধ বোঝা এবং Arduino প্রজেক্টে খুবই উপযোগী।

See how it reacts to a magnet

Choose what the magnet is doing to see what the signal pin tells your board.

Specifications

What you can build

Anything that moves, turns or opens can carry a magnet.

Wiring it to Arduino

3.3V boards: on an ESP32 or Raspberry Pi, power the module from 3.3V so the signal never goes above 3.3V. Test your module first, because the A3144E works best at about 4.5V or higher. Do not feed a 5V signal into a 3.3V pin.

Basic Arduino code: detect a magnet

const int hallPin = 2;
const int ledPin = 13;
void setup() {
  pinMode(hallPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}
void loop() {
  if (digitalRead(hallPin) == LOW) {   // magnet detected
    digitalWrite(ledPin, HIGH);
    Serial.println("Magnet detected");
  } else {
    digitalWrite(ledPin, LOW);
  }
  delay(100);
}

Basic Arduino code: RPM counter

Fix one magnet to a rotating wheel or shaft. The sketch counts pulses for one second and prints the speed in turns per minute.

volatile unsigned long pulses = 0;
void countPulse() {
  pulses++;
}
void setup() {
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), countPulse, FALLING);
  Serial.begin(9600);
}
void loop() {
  delay(1000);
  noInterrupts();
  unsigned long p = pulses;
  pulses = 0;
  interrupts();
  Serial.print("RPM: ");
  Serial.println(p * 60);   // one magnet = one pulse per turn
}

Questions buyers ask