Sensor-Arduino Reed Switch:

• The KY-025 Reed Switch Module is a small electrical switch that functions as a proximity sensor when a magnetic field is applied.
• The module's outputs are both digital and analog.
• The sensor's sensitivity is calibrated using a trimmer.
• compatible with microcontrollers such as the ESP32, which is Arduino, and Raspberry Pi.
• Use just the KY-021 mini reed switch for digital output.