What's the best way to detect a magnet? Use another magnet. But if it's not sensitive enough, you may have to feel it by youself. Right? This magnetic sensor knows whether there is a magnetic object nearby or not. And it correctly tells you through digital output. See below picture for a quick demo!


Connection Diagram

Digital magnetic sensor Diagram

Sample Code

int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin
int val = 0;                    // variable for reading the pin status
void setup() {
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare pushbutton as input
void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, LOW);  // turn LED OFF
  } else {
    digitalWrite(ledPin, HIGH); // turn LED ON

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