基于单片机控制的超声波测距报警系统设计,用8位数码管显示，当测试距离小于200mm开灯2亮，当测试距离继续减小到100mm以下灯1亮。-Microcomputer Control Ultrasonic Distance Alarm System Design, 8-digit LED display, when the test is less than 200mm away from bright lights two when testing continues to be reduced

能实现精度高达1mm测距，还具有测量光强，手势功能(It can achieve up to 1mm precision ranging, and also has the function of measuring light intensity and gesture)