使用单稳态触发电路作“延时”或“定时”用，由于受到元件和器件的影响，其精度不会太高。
The accuracy of delay or timing is not sensitive with monostable trigger circuit since electrical elements have influence on it.
表面上看来，这些症状可以是生产流程不定时停止，也可以是电子元件过早出现故障。
The symptoms are seemingly random stoppages in production and premature failures in the electronics.
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。
Distance measurement is realized by ultrasonic sensors, light intensity detection is achieved by photosensitive element, timer function is realized by 89c52's timer.
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