What\’s the best way to detect the magnet? Use anther magnet. But it\’s not sensitive enough, and you have to feel it by yourself. This magnetic sensor knows whether there is a magnetic object nearby or not, and it correctly tells you through a digital output. Features Wide voltage range from 3.3V to 5V Standard assembling structure (Times-of-5mm Center distance between two 3mm mounting holes) Easily recognitive interfaces of sensors (\”A\” for analog and \”D\” for digital) Icons to simplely illustrate sensor function High quality connector Immersion gold surface Connection Example – I/O Expansion Shield V7 Specifications Supply Voltage: 3.3V to 5V Indicator LED on board Interface: Digital Size: 22 x 30mm Resources Product Wiki Schematic Package Contents 1x Digital magnetic sensor 1x Digital cable