KY-021 reed module - digital magnetic sensor, 3,3-5 V
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Description
Product Overview
- Magnetic sensor module with reed switch for detecting magnetic fields
- Digital output for direct signal processing
- Operating voltage: 3.3 to 5 V
- Connections for signal, ground, and power supply
- Contactless activation with no mechanical wear
- Switching output changes state when near a magnetic field
Product Description
The module detects magnetic fields using a reed switch and outputs the result as a digital signal. The switch consists of two ferromagnetic contacts in a glass capsule that come together in a magnetic field, closing the circuit.
The output provides a digital HIGH or LOW signal that can be read directly by microcontrollers. Its contactless operation eliminates wear on switching surfaces or mechanisms. The switching frequency is practically unlimited.
The module is suitable for door monitoring in security systems, position detection for moving parts, detecting valve positions, and sensing rotating wheels in counting applications. For example, in an automated inventory system, the module signals when a magnetized container card reaches a certain position.
The operating voltage of 3.3 to 5 V makes the module a universal sensor for various microcontroller platforms. It only requires a suitable power supply. The switch responds to magnetic field strength and proximity; the exact trigger distance depends on the strength of the magnet used.
Safety Notice
This module is intended exclusively for building prototypes and for testing and development purposes, and is not suitable for installation in household electrical circuits. For use in safety-critical applications, system reliability must be validated separately. Consult a qualified electrician before commissioning if you have questions about integrating it into existing systems.
Package Contents
- 1x KY-021 - Magnetic Reed Module, Reed Switch