The Magnetic Door Sensor Wired Reed Switch is a simple and reliable magnetic contact sensor designed to detect whether a door, window, cabinet, drawer, or other movable object is open or closed. It consists of a reed switch and a matching magnet that work together to provide a simple ON/OFF switching signal.
When the magnet is positioned close to the reed switch, the internal contacts change state. When the door or window is opened and the magnet moves away, the contacts return to their original state. This makes the sensor ideal for security systems, alarm circuits, home automation, Arduino projects, IoT applications, and access monitoring systems.
Its wired design allows it to be easily connected to microcontrollers, alarm systems, relay circuits, and other electronic control systems.
Key Features
- Magnetic Door and Window Contact Sensor
- Wired Reed Switch Design
- Includes Matching Magnet
- Simple ON/OFF Detection
- Normally Open/Closed Switching Depending on Installation and Contact Configuration
- No External Power Required for the Reed Switch
- Easy to Install
- Compact and Lightweight
- Suitable for Security and Automation Systems
- Compatible with Arduino, ESP32, and Other Microcontrollers
- Ideal for DIY and IoT Projects
Technical Specifications
- Product Type: Magnetic Reed Switch Door Sensor
- Sensor Type: Reed Switch
- Detection Method: Magnetic Field
- Connection Type: Wired
- Number of Parts: Reed Switch + Matching Magnet
- Output Type: Mechanical Contact / Switch
- Power Requirement: No Separate Power Required for Reed Contact
- Contact Configuration: Depends on the specific reed-switch version
- Mounting: Screw, Adhesive, or Suitable Mounting Method
- Application: Door, Window, Cabinet, Drawer, and Access Detection
Working Principle
The sensor consists of two main parts:
- Reed Switch: Contains magnetically operated electrical contacts.
- Magnet: Installed on the moving part of the door, window, or other object.
When the door is closed, the magnet is positioned near the reed switch and causes its internal contacts to change state.
When the door is opened, the magnet moves away from the reed switch, causing the contacts to return to their original state.
A microcontroller or alarm circuit can monitor this change and determine whether the door or window is open or closed.
For example, an Arduino or ESP32 can read the reed switch as a digital input and trigger an alarm, activate a light, send a notification, or record an access event when the door is opened.
Applications
- Door Open/Close Detection
- Window Open/Close Detection
- Home Security Systems
- Burglar Alarm Systems
- Cabinet Security
- Drawer Monitoring
- Smart Home Automation
- Arduino Projects
- ESP32 IoT Projects
- Access Monitoring
- Refrigerator and Appliance Door Detection
- Industrial Equipment Monitoring
- DIY Security Projects
Advantages
- Simple and reliable operation
- No dedicated power required for the reed contact
- Easy to connect to microcontrollers
- Low-cost sensing solution
- Compact design
- Easy to install
- Suitable for security and automation applications
- Low maintenance
- Long service life when operated within its contact ratings
Usage Tips
- Install the magnet and reed switch so they are properly aligned when the door is closed.
- Keep the magnet sufficiently close to the reed switch for reliable switching.
- Avoid excessive mechanical movement or vibration around the sensor.
- Connect the sensor to the appropriate digital input when using it with a microcontroller.
- Use an appropriate pull-up or pull-down configuration depending on your circuit.
- Do not exceed the reed switch’s contact voltage and current ratings.
- Keep the sensor away from strong external magnetic fields that may cause unintended switching.
- Secure both parts firmly to prevent misalignment during repeated door operation.
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