If using dynamic find, make sure all controls that will be manipulated inside the timer have been found and bound prior to starting the measurement.

如果使用动态搜索，那么您需要确定在定时器内部控制的所有控件，都需要在开始评价之前搜索到。

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Distance measurement is realized by ultrasonic sensors, light intensity detection is achieved by photosensitive element, timer function is realized by 89c52's timer.

测距是利用超声波传感器来实现，光强检测是通过光敏元件实现，定时功能由89c52单片机定时器实现的。

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