便携式温湿度计设计毕业论文.pdfVIP

毕 业 论 文 2007 届 便携式温湿度计 学生姓名 **** 学 号 院 系 工学院机电系 专 业 指导教师 完成时 便携式温湿度计 摘 要 设计了一种携带方便的温湿度检测仪表，它具有体积小、功耗低、 适应性强等特点。设计中采用低功耗的P89LPC922单片机配合相应的 电源管理程序，它除了正常于工作方式外，还工作于空闲模式、掉电 模式和完全掉电模式三种节电模式，在采样和显示的间隔时间内切换 到相应的节电模式，通过多种手段降低了MCU系统的平均功耗。使用 了微功耗的SHT11数字式温湿度传感器，它采用独特的CMOSens TM技 术，具有数字式输出、免调试、免标定、免外围电路及全互换的特点。 使用段式LCD做显示器。使用串行接口的DS1302做时钟芯片。采用锂 电池配合高性能的LDO为系统提供了稳定、高效的电源。通过对系统 中各模块的功耗控制，实现了系统微功耗的要求，在3.6V/2AH的锂电 池供电下可以连续工作两年。并且温度检测精度可达0.4℃，湿度检 测精度为+3%RH。 关键词 便携式温湿度计；微功耗；电源管理；SHT11；P89LPC922 2 DESIGN OF Portable Hygrometer And Thermometer ABSTRACT Portable Hygrometer and tempmeter is a portable detection of temperature and humidity gauges, it is of small size, low power consumption, Features such as adaptability. The design of a low-power microprocessor P89LPC922 corresponding power management procedures, and the use of micro-power consumption SHT11 digital temperature and humidity sensor, struts LCD, DS1302 clock chip, Implementation of the system-power requirements, 3.6V/2AH lithium battery power can work for the next two years. Temperature measurement accuracy up to 0.4 ° C, humidity measurement accuracy of +3%RH. SHTI1 unique CMOSens TM technology with the digital output from testing, calibration - free, from the external circuit and the whole exchange characteristics. P89LPC922 addition to the normal work styles still idle mode Power-off mode and completely power off mode power saving mode three, Sampling 3 shows that the time interval corresponding to the switchin power saving mode, which will reduce the average system power consumption. Lithium batteries with high-performance systems for