The transistor switches if the module is held in a magnetic field. This can then be read out at the signal output as an analogue voltage value. The sensor can be permanently soldered or used on a breadboard. https://elecena.pl/product/28015655/joy-it-hall-effect-magnet-sensor 2025-03-12 https://elecena.pl/product/28015655/joy-it-hall-effect-magnet-sensor 2025-07-18 https://elecena.pl/product/28015655/joy-it-hall-effect-magnet-sensor 2025-08-07 https://elecena.pl/product/28015655/joy-it-hall-effect-magnet-sensor 2025-09-17