5Pcs Magnetic Reed Switch Sensor Module, Normally Closed Hall Effect Detection Board, Digital Output 3.3V–5V for arduino for Raspberry Pi MCU Projects

Key features

• This magnetic sensor module uses a reed switch element to detect the presence of a magnetic field. When a magnet approaches the sensing area, the internal reed contacts change state, allowing the module to output a corresponding digital signal for control logic applications.
• Configured as a normally closed type, the output signal changes when magnetic flux is detected. This configuration supports state monitoring applications where default closed-circuit logic is required in embedded systems and microcontroller-based projects.
• Operates within a 3.3V to 5V DC voltage range, enabling direct connection to common development boards without additional level shifting components. The digital output can be read directly by GPIO input pins.
• Compact PCB design with clearly labeled VCC, GND, and DO pins simplifies wiring and installation. The board format supports breadboard use and integration into prototype circuits and custom enclosures.
• Suitable for position sensing, door state detection, motion limit indication, and magnet-triggered control logic in educational electronics projects and embedded development systems.

Product Description This module is a magnetic detection sensor based on a reed switch sensing element. The reed switch changes its contact state when exposed to a nearby magnetic field. In the normally closed configuration, the output signal switches when a magnet is detected near the sensing area. The module provides a digital output signal that can be directly connected to a microcontroller input pin. It operates on a DC voltage range of 3.3V to 5V, allowing compatibility with common development platforms. An onboard indicator LED displays output status for visual monitoring during testing and integration. The compact PCB design allows installation in embedded control systems, mechanical position sensing applications, and electronic prototype projects.  Technical Specifications Sensor Type: Magnetic reed switch sensor Switch Configuration: Normally Opened (NO) Operating Voltage: DC 3.3V – 5V Output Type: Digital output (High / Low) Detection Method: Magnetic field activation Interface Pins: VCC, GND, DO Indicator: Onboard signal LED Response Time: Mechanical reed switching response PCB Size: Approx. 32mm × 14mm Mounting Type: Through-hole pin header

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