Adafruit TLV493D Triple-Axis Magnetometer - STEMMA QT/Qwiic
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The TLV493D 3-axis magnetometer is a great little sensor for detecting magnets in 3D In fact, the manufacturer Infineon suggests it could be used to make a joystick! You could also use it for other cool things like detecting objects with magnets attached, like the lid of a box, or maybe a statue that unlocks your secret lair when placed on your mantle?
The TLD493D excels at measuring nearby magnetic fields in three dimensions. It's not going to make a good compass, it's not sensitive enough to pick up the Earth's magnetic field, but you can use it to track the movement of nearby magnets in three dimensions.
Here are a few specs: