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Mini Reed Switch Module Arduino Compatible

Arduino Compatible ARD2 Mini Reed Switch Module


1 $3.95


A reed module is a magnetic sensor that is normally open and closes when exposed to a magnetic field. In the test code below, the built-in LED on pin 13 flashes if the sensor is closed. A magnet must be near the sensor to close the switch. The module includes a 10K Ohm resistor, so no additional parts are needed.

Test Code

// Example code for sensor KY021
// More info on magnetic_reed_modules

int Led = 13; // define LED Interface
int buttonpin = 3; // define the Reed sensor interfaces
int val; // define numeric variables val

void setup() {
pinMode(Led, OUTPUT); // define LED as output interface
pinMode(buttonpin, INPUT); // output interface as defined Reed sensor

void loop() {
val = digitalRead(buttonpin); // digital interface will be assigned a value of 3 to read val

// When the Reed sensor detects a signal, LED flashes
if (val == HIGH) {
digitalWrite(Led, HIGH);
else {
digitalWrite(Led, LOW);


  • Completes circuit when a magnetic field is detected
  • No additional parts required


Board Colour





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Mini Reed Switch Module Arduino Compatible



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