Reed Switch Module — Magnetic Contact Sensor, Digital Output, Arduino Compatible

Reed Switch Module — Magnetic Contact Sensor, Digital Output, Arduino Compatible

This reed switch module uses a magnetically-actuated reed switch to detect the presence of a magnet without any physical contact. When a magnet is brought within range, the reed switch closes and the module outputs a digital signal. Unlike mechanical switches, reed switches have no moving parts exposed to the environment, making them ideal for sealed enclosures, door/window detection, and liquid level sensing. The module includes a PCB with pull-up resistor and 3-pin header for direct Arduino connection.

Module Specifications

• Sensor Type: Reed switch (magnetically actuated)
• Output: Digital (HIGH when no magnet, LOW when magnet present)
• Operating Voltage: 3.3V – 5V DC
• Connector: 3-pin male header (GND, VCC, Signal)
• Actuation: Magnetic field (no physical contact required)

Reed Switch vs Hall Effect Sensor

• Reed switch: Mechanical contacts, simple digital output, lower cost — for basic presence detection
• Hall effect sensor: Solid-state, can detect polarity and field strength — for precise position and speed sensing

Typical Applications

• Door / window sensor: Detect open/closed state of doors and windows for security systems
• Liquid level detection: Float-mounted magnet triggers reed switch at set liquid level
• Proximity detection: Detect presence of magnetic objects without contact
• Rotation counting: Count rotations of a shaft with a magnet attached
• Tamper detection: Detect opening of enclosures in security applications

Package Contents

• 1 × Reed switch module with 3-pin header

Non-contact magnetic detection — reed switch module with digital output for door/window sensing, liquid level detection, and proximity sensing in Arduino projects.

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