It ’ s a medical treatment equipment of high capability but low price . this thesis chooses a discal peristaltic pump and put forward amelioration schemes based on analysis of trait of transfer pump in common use presently and selects stepper motor as drive motor . in order to reduce the whole volume , the pcb board integrates stepper motor drive circuit , keyset , alarm circuit and lcd 本文在分析目前常用输液泵的优缺点的基础上,选择dg - 1盘状蠕动泵,并进行了结构改进;选择步进电机作为输液泵的驱动电机,为缩小整体的体积,将步进电机的驱动电路、按键、 lcd和报警电路集成到单板上。
2 . the particular water level - controlling circuits and sensor circuits in the patrolling point can monitor the change of water level and the vibration of apparatus in order to inform managers in time . at the same time if the change is n ' t within normal range , the alarming circuit can send the message . 3 2 、在巡检点中设置了独特的液位监控电路和传感器电路以便及时监测水位变化和水轮机组振动情况，将变化数据快速通知管理者，若变化在规定范围之外，巡检仪中的报警电路将及时报警。
Based on the investigations of domestic and overseas road traffic safety researching , this paper studies the whole scheme of vehicle operation parameters monitoring system aimed at improving road traffic safety , selects the monitoring parameters which are classified by functions and their sensors , designs the sensor signal processing circuits , the software and hardware of ecu , the display and alarm circuits as well as anti - jamming circuits , realizes the functions of displaying , alarming and " black - box " , and forms a suit of practicality methods of designing vehicle running parameters monitoring system , provides references for research and development of other on - board intelligent devices 本文在分析了国内外有关汽车行驶安全研究成果和发展趋势的基础上，以汽车运行安全为目标，确定了汽车运行安全参数监控系统总体方案，选择了运行安全监控参数，并按功能不同进行了分类，选择了传感器并设计了相应的信号处理电路。完成了电子监控单元软、硬件的设计以及显示、报警电路和抗干扰设计，实现了汽车运行过程中安全参数的显示、报警和“黑匣子”功能，形成了一套汽车运行安全参数电子监控系统设计的实用方法，为其它车载智能化仪器仪表及相关仪器的研究开发提供了借鉴。
The instrument include cpu , sensitive element , canmengou monitoring circuit , little signal amplify circuit , a / d transform circuit , communication circuit , display circuit , monitoring circuit , cpu is the core in the instrument , complete data gather , process , export , display and so on 仪器能够根据甲烷浓度报警限( 1 . 00 )进行声、光报警，并启动排风设备，同时具有通信功能。仪器由cpu 、敏感元件、看门狗监控电路、小信号放大电路、 a d转换电路、通信电路、显示电路、报警电路等组成。
