KY-021 Mini Reed Relay Sensor Module (Magnetic Sensor)

Meet the KY-021 Mini Reed Relay Sensor Module (Magnetic Sensor), a perfect choice for your DIY electronics projects. This compact sensor uses the reed switch principle to detect the presence of a magnetic field and closes the circuit when a magnet approaches. Due to its simple operating principle, it easily integrates with Arduino, ESP32, and other microcontroller platforms, making it an ideal solution for monitoring door and window openings in robot projects, flow in water pipes, or status changes in various automation systems. With its high sensitivity and reliability, this sensor offers a wide range of application possibilities in your electronics hobby or educational projects. Additionally, its small size makes it convenient for use in tight spaces, making it indispensable in various "pipe" or "relay" based systems.