KY-021 Mini Magnetic Reed Module

25.00 EGP

A reed module is a magnetic sensor that is normally open and get closed when exposed to a magnetic field. The module includes a 10K Ohm resistor.

In stock


KY-021 Mini Magnetic Reed Connectivity

  • Arduino GND –> Module pin –
  • Arduino +5V –> Module PLUS (middle pin)
  • Arduino Digital pin 3 –> Module S


// Example code for sensor KY021
// More info on
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
  if (val == HIGH) // When the Reed sensor detects a signal, LED flashes
    digitalWrite (Led, HIGH);
    digitalWrite (Led, LOW);

Additional information

Weight5 g


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