Switch Reed Magnetic Mini Sensor Module

The Reed Switch Sensor Module is a compact and versatile electronic module designed to detect the presence or absence of a magnetic field. The module comprises several components including a Reed Switch, resistors, capacitor, potentiometer, comparator LM393 IC, power, and status LED, all integrated on a single circuit board.

Package Includes:

1 x Reed Switch Sensor Module

Magnetic Switch and Sensor

6.30 AED (Tax included)

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Terms and Conditions
30-day money-back guarantee
Shipping: 2-3 Business Days

Features

Simple magnetic proximity detection
Digital output (HIGH/LOW)
Built-in pull-up resistor and signal conditioning circuit
Compact and easy to integrate
Compatible with Arduino, Raspberry Pi, and other microcontrollers

Specifications

Parameter	Value
Operating Voltage	3.3V – 5V DC
Output Type	Digital (High/Low)
Detection Method	Magnetic field
Module Dimensions	Approx. 32mm x 14mm
Mounting Hole	Yes

Pinout

Pin	Label	Description
1	+	VCC (3.3V to 5V power supply)
2	–	GND (Ground)
3	S	Signal output (HIGH when no magnet, LOW when magnet is present)

Working Principle

When a magnet approaches the glass-encapsulated reed switch inside the module, the reeds are attracted to each other and close the circuit. This change is detected by the onboard circuitry and provided as a digital signal (LOW). When the magnet moves away, the reeds separate, and the output returns HIGH.

Wiring with Arduino

Reed Switch Module	Arduino
+	5V
–	GND
S	D2 (or any digital I/O pin)

Example Arduino Code

const int reedPin = 2;  // Pin connected to the reed switch
const int ledPin = 13;  // Built-in LED

void setup() {
  pinMode(reedPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int sensorState = digitalRead(reedPin);
  if (sensorState == LOW) {
    Serial.println("Magnet detected!");
    digitalWrite(ledPin, HIGH);
  } else {
    Serial.println("No magnet.");
    digitalWrite(ledPin, LOW);
  }
  delay(200);
}

Applications

Door/window position detection
Security alarm systems
Robotics position feedback
Reed relay triggering
Speed sensors (when combined with rotating magnets)

Comparison with Similar Sensors

Sensor	Detection Method	Output	Use Case
Reed Switch Module	Magnetism	Digital	Simple proximity or magnetic detection
Hall Effect Sensor	Magnetic field strength	Analog or Digital	More precise magnetic field measurement
PIR Motion Sensor	Infrared radiation	Digital	Human/animal motion detection

Notes

Ensure proper orientation of the magnet relative to the sensor.
Avoid exposure to strong mechanical shocks that may damage the reed tube.
Use pull-up or pull-down resistors if needed for specific microcontroller configurations.