Reed Switch 2×14mm Normally Open Magnetic Sensor

Overview

A normally-open reed switch — closes when a magnet comes near, a simple and reliable way to detect door/lid open-close states.

Key Specs

Features

• Purely mechanical/magnetic — no power needed for the switch itself
• Simple 2-wire connection

Compatible With

Any digital input pin on Arduino, ESP32, etc. (typically with a pull-up resistor)

Use Cases

• Door/window open-close detection
• Magnetic switches for paper-circuit or craft kits

FAQ

Does it need power? No — it's a passive mechanical switch; only the microcontroller reading it needs power.