Reed Switch Module(KY-025)

A switch module that operates magnetically.

Specifications

• Operating Voltage: 3.3V ~ 5V
• Note: Although it has an analog output terminal, it only outputs 0 or 1023.

Example Hardware Used

• Arduino Board
• Jumper Cables
• LED (5mm)
• Reed Switch Module

Connection

Reed Switch		LED	Arduino
GND		-	GND
		+	D8
+			5V
DO			D7

Example Code

This code turns on an LED depending on the state of the reed switch.

int reed = 7;
int led = 8;

void setup() {
  pinMode(reed, INPUT); 
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);
}

void loop() {
  if (digitalRead(reed) == HIGH) {
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }
}