国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

With the increasing number of drivers, uncivilized driving behavior is more and more. The traffic accidents caused by fatigue driving occupy a large proportion, causing great losses to people's lives and property. Therefore, it is of great significance and practical value for the technical research of driver drowsiness warning device. Based on the analysis and processing of human pulse wave signal, the pulse frequency characteristic signal which can reflect the sleepy state of the driver is used as the basis. The driver drowsiness warning device is composed of STC89C52 microcontroller, buttons, digital tube, photoelectric sensor, clock module, filter circuit , integrated operational amplifier and so on. The results of debugging show that the device identification accuracy, numerical reliability, can effectively detect the driver drowsiness, and issued a warning in the sleep state. Compared to the same type of product in the market, the device has the characteristics of low cost, simple operation and the ability to carry on the vehicle, to provide technical and experimental basis for related research of driver drowsiness warning technology.