Members Only Explanation
Magnet Finder With a Simple Hall-Effect Sensor
May 26, 2025
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Construct this easy-to-make tool to detect hidden magnets and sensors inside modern appliances. You will find it ideal for repairs, experimentation, or simply for fun!
Recently, one of these coffee machines refused to operate, showing a red icon despite all parts seemingly in place. That means either one of the sensors is faulty, or a magnet has fallen out of its proper loca...
A Practical Solution
The idea for this device came out of practical need, specifically during repair sessions at a Repair Café location, where I often volunteer. More and more home-barista coffee machines are brought in for repair. These often include built-in safety systems that prevent operation if any of the removable parts, like trays or containers, are not properly inserted. Instead of mechanical switches, which wouldn’t last long in the humid and powder-filled environment inside such machines, manufacturers use proximity switches made of Hall-effect sensors, with hidden magnets in the removable parts.Recently, one of these coffee machines refused to operate, showing a red icon despite all parts seemingly in place. That means either one of the sensors is faulty, or a magnet has fallen out of its proper loca...