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Reed Switch Sensor Module

A reed switch is a sensor that closes the circuit in the presence of a magnetic field. Reed sensors can be used in many applications where contactless on/off is required. However, reed switches can be fragile to use directly, hence this module can make it easier to handle and mount the sensor in various applications.


Reed Switch Sensor Module Pinout Configuration

Pin Name




The Vcc pin powers the module, typically with +5V


Power Supply Ground


Digital Out Pin for Digital Output.


Reed Switch Magnetic Sensor Module Features & Specifications

  • Operating Voltage: 3.3V to 5V DC
  • Output format: Digital switching output ( 0 and 1 )
  • LEDs indicating output and power
  • PCB Size: 32mm x 14mm
  • LM393 based design
  • Easy to use with Microcontrollers or even with normal Digital/Analog IC
  • Small, cheap and easily available


Alternate Sensor Modules: IR Sensor Module, LDR Sensor Module, TP4056A Li-ion Battery Charging/Discharging Module, DS3231 RTC Module, TMC2209 Stepper Motor Driver Module, DRV8825 Stepper Motor Driver Module, A4988 Stepper Motor Driver Module, NEO-6MV2 GPS Module, Joystick Module, EM18 - RFID Reader Module, Soil Moisture Sensor

Related Components: LM393 Comparator IC, 10K Potentiometer, Capacitor, Resistor, LEDs


Brief about the Reed Switch Sensor Module

The Reed Switch Sensor Module consists of a Reed Switch, resistors, capacitor, potentiometer, comparator LM393 IC, Power, and status LED in an integrated circuit. This sensor module can be used in photocopiers, washing machines, refrigerators, cameras, disinfection cabinets, doors, window magnetics, electromagnetic relays, electronic weighing, level meters, gas meters, water meters, etc.

Reed Switch Sensor Module


LM393 IC

LM393 Comparator IC is used as a voltage comparator in this Reed Switch sensor module. Pin 2 of LM393 is connected to Preset (10KΩ Pot) while pin 3 is connected to Reed Switch. The comparator IC will compare the threshold value set using the preset (pin2) and the LDR (pin3).


Reed Switch

Reed switch is a passive electronic switching component used to control the flow of electricity in a circuit. Reed Switch consists of a sealed glass envelope in which two ferrous elastic reeds are encased and this glass envelop is filled with an inert gas called rhodium. In normal conditions, the two reeds are separated in the envelope but when a magnetic substance approaches the glass envelope, the reeds will come together due to the magnetic field thus completing an electric circuit.


How to Use the Reed Switch Sensor Module

Reed Switch Sensor Module consists of three pins i.e. VCC, GND, and DO. The digital out pin is connected to the output pin of the LM393 comparator IC. The internal Circuit diagram of the Reed Switch Sensor Module is given below.

Reed Switch Sensor Module Circuit Diagram

Using the Reed Switch sensor module with a microcontroller is very easy. Connect the Digital Output pin of the module to the Digital pin of Microcontroller. Connect VCC and GND pins to 5V and GND pins of Microcontroller. When the Reed Switch sensor detects the magnetic field, it closes the circuit and the digital pin of the module that is connected to the LM393 IC goes high.


Applications of Reed Switch Sensor Module

  • Photocopiers
  • Washing machines,
  • Refrigerators
  • Door Magnets
  • Electromagnetic Relays, Electronic Weighing devices, Level Meters, etc.

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