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DIY Motion Activated Snow Globe - The Learning Circuit
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Passive infrared motion sensors: a two-bit camera powered by crystals
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How Do Hall Effect Sensors Work? - The Learning Circuit
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Effective Ways To Detect People With Common Sensors
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How PIR modules work and using them to control LED strings.
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How Motion Sensors and Belt Loaders are Made | How It's Made | Science Channel
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How Thermistors Work - The Learning Circuit
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