Adafruit Magnetic contact switch (door sensor)

This compact sensor consists of a reed switch and a magnet, both housed securely within a durable ABS plastic shell. When the magnet is within 13mm (0.5") of the switch, it closes the circuit, enabling functionality.

Benefits include versatile mounting options with provided screws or easy installation using double-sided foam tape for a seamless setup. Common applications involve detecting the open or closed status of doors and drawers, making it essential for security and automation projects.

With its simple yet effective design, this sensor is a reliable component for various electronics projects, functioning much like a guardian that signals precise movements within small spaces.