驾驶员疲劳监测系统设计本科论文 .doc

目录 摘 要： 1 Abstract: 2 1 前言 3 1.1 什么是疲劳驾驶 3 1.2 疲劳驾驶与交通事故 3 1.3 怎么预防疲劳驾驶 4 1.4 小结 4 2 本设计的总体思路及其理念 5 2.1 单片机介绍 7 2.2 AT89C2051单片机的芯片管脚介绍 8 2.3 设计方案 5 2.3.1 检测方法 6 2.3.2 检测原理 5 2.3.3 系统设计方案 5 3 系统硬件部分的设计 7 3.1 心率采集控制系统 8 3.2 单片机控制电路 12 3.2.1 晶振电路 12 3.2.2 复位电路 13 3.2.3 工作原理 13 3.2.4 元器件的选取 15 3.3 小结 15 4 系统软件部分的设计 16 4.1 主程序设计 16 4.2 定时程序设计 17 4.3 中断子程序设计 18 4.4 显示子程序设计 21 5总结 23 6致辞 24 参考文献 24Driving alarm system of automobile fatigue Abstract: As everyone knows,?the car?has already become?a?necessary?traffic?tool in our life,?and?it is closely related to?our life,?but because?our lives?affect our?fatigue driving?traffic accidents caused by the?equivalent,?either from the?property,?spirit?are?deeply?hurt,?so how to reduce the?fatigue of daily life?the?driving is?very far-reaching significance?. Blood flow in human tissues is accompanied by the pulsation of the heart and the change of blood saturation in blood vessels is changed, so the tissue degree of the human tissue will be changed.. When the blood was sent to various parts of the body tissue and vascular blood saturation will change organization of the corresponding semi transparency will reduce; when the blood to flow back to the heart, the saturation of blood vessels of human tissue becomes small, corresponding to its semi transparency will be increased. So if in human tissue is relatively weak local (for example fingertip and earlobe) using infrared LEDs to produce infrared radiation, you can use infrared triode tube receives and converts it into an electrical signal. Because a test using the method of pulse signal with the body of the pulse frequency is proportional to, the pulse signal as long as by certain functions of the circuit into a pulse signal and carries on the corresponding processing, you can realize the detection of pulse frequency is detected at any time to. And if the pulse frequency detection to lower or higher than 20 percent of the normal value, SCM the were output analysis, and