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.

Specifications:

• This module consist of a 2x14mm normally open reed switch
• LM393 dual differential comparator
• a 3296W-104 trimmer pontetiometer
• 6 resistors
• 2 LEDs
• 4 male header pins.
• Operation Voltage: 3.3V ~ 5.5V
• Board Dimensions: 1.5cm x 3.6cm [0.6in x 1.4in]