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How Light Sensors Adjust Streetlights Automatically
光传感器如何自动调节路灯亮度
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Streetlights now turn on only when it gets dark.路灯现在只在天黑时才亮起。
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Tiny light sensors detect how much natural light is present.微型光传感器可检测环境自然光强度。
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When sunlight fades, the sensor sends a signal to the lamp.阳光减弱时，传感器会向灯发送开启信号。
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This saves electricity and reduces light pollution at night.这节省了电力，减少了夜间光污染。
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The sensor works even on cloudy or rainy days.阴天或雨天，传感器依然正常工作。
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No human needs to flip a switch or set a timer.无需人工开关或设置定时器。
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It is a simple but smart use of STEM in cities.这是STEM技术在城市中一种简单而智能的应用。
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Many modern streetlights use this automatic system daily.许多现代路灯每天都在使用这种自动系统。