Most of them sense sound, light, pressure, or motion.įor example, some automatic doors operate when they’re triggered by sensors that sense pressure. There are many different types of sensors. Sensors do exactly what they sound like they’d do: they sense things. Automatic doors operate with the help of sensors. Those doors-known as automatic doors-open and close with the help of technology, not magic. What’s going on here? Is something supernatural at work? Is there a ghost standing nearby opening the doors for people leaving the supermarket? Nope! Would you believe it’s pure science and technology? Just then, the doors open with a “Swoosh!” as if by magic! How are you going to open it with your hands full? You’re thinking of setting some bags down.
Your hands are full of bags of groceries. There you are, getting ready to leave the supermarket.
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