Tilt sensor
thingiverse
As seen in https://www.youtube.com/watch?v=wYf_vvX2sNM, a tilt sensor provides a simple yet effective solution for various applications. I utilize this device to turn on garden lights, a task that infrared sensors cannot accomplish without being triggered by local wildlife such as foxes and cats. This sensor requires only one metal pendulum and some wire to function properly.
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