本设计依靠光敏电阻对光照敏感的特点，自动检测并显示当前所在环境的光照强度，并根据光照强度的大小，来控制继电器，从而控制路灯的开启和关闭。
该设计可分为四部分:即光照检测部分、信号处理部分、显示部分和执行部分。
光照检测部分利用光敏电阻的特性（光照越强阻值越小，光照越弱阻值越大），通过检测光敏电阻两端电压变化的模拟量，来反映光照强度。(This design relies on the photoresistor's sensitivity to light, automatically detects and displays the illumination intensity of the current environment, and controls the relay according to the illumination intensity, so as to control the opening and closing of the street lamp.
The design can be divided into four parts: illumination detection part, signal processing part, display part and execution part.
The part of illumination detection uses the characteristics of photoresistor (the stronger the illumination, the smaller the resistance value, the weaker the illumination, the larger the resistance value), and reflects the illumination intensity by detecting the analog value of the voltage change at both ends of photoresistor.)