What's the best way to detect the magnet? Use anther magnet. But it's not sensitive enough. You have to feel it by yourself. This Hall sensor knows whether there is a magnetic object nearby or not, and it correctly tells you through a digital output. Note: It's a omnipolar magnet dectector so that it can not tell two polarities apart. 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 * Wiki Doc * DataSheet * Schematics Package Contents * 1x Hall Sensor * 1x Cable https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2023-03-06 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2023-12-27 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2024-09-19 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2024-11-29 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2024-11-30 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2025-02-13 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2025-04-11 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2025-11-28 https://elecena.pl/product/22715003/gravity-digital-hall-sensor 2025-11-29