KY-021 Magnetic Mini Reed Switch Sensor | Robochacha Pakistan

Makers choose the KY-021 Magnetic Mini Reed Switch Module when they need a compact and reliable way to monitor physical openings. Specifically, the module features a tiny, gas-filled glass envelope containing two overlapping ferromagnetic blades. As a result, the switch closes instantly when exposed to a magnetic field. Therefore, you can hide the sensor inside a door frame and place a small magnet on the door to create an “invisible” security trigger. Furthermore, the module includes a 10kΩ pull-up resistor. As a result, you receive a stable digital signal directly into your Arduino without extra wiring.

Additionally, this sensor is completely passive and draws no power until the switch is triggered. Consequently, it is the most energy-efficient choice for battery-powered IoT security systems. Because of this, the KY-021 Magnetic Mini Reed Switch Module is a core component for smart home automation kits.

Key Features ✨

• High Magnetic Sensitivity: The sensor detects magnets from several centimeters away. Specifically, it provides a clean “HIGH/LOW” signal for your microcontroller.

• Non-Contact Operation: No physical contact is required between the magnet and the sensor. Therefore, there is zero mechanical wear, ensuring millions of successful triggers.

• Integrated Pull-up Resistor: This KY-021 Magnetic Mini Reed Switch Module is “plug-and-play.” Consequently, it eliminates the floating pin issues common with raw reed switches.

• Compact Mini Form Factor: The PCB is designed to be as small as possible. As a result, it fits easily into slim window tracks or inside small robotics assemblies.

• Durable Glass Housing: In addition, the switch is sealed against dust and moisture. Specifically, this makes it more reliable than mechanical buttons in harsh environments.

Technical Specifications ⚙️