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KY-021 Mini magnetic reed modules by herrerodani

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[Arduino KY-021 Mini magnetic reed modules](https://tkkrlab.nl/wiki/Arduino_KY-021_Mini_magnetic_reed_modules) ![enter image description here](https://tkkrlab.nl/w/images/thumb/6/65/Ky021.jpg/400px-Ky021.jpg "enter image title here")

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