便携式温湿度计设计说明书(63).doc

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
完成时间
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36V/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04℃，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
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, 36V/2AH lithium battery power can work for the next two years Temperature measurement accuracy up to 04 ° 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 shows that the time interval corresponding to the switching power saving mode, which will reduce the average system power consumption Lithium batteries with high-performance systems for LDO provides a stable, efficient power
This paper provides detailed descriptions of such portable temperature humidiometer design
KEY WORDS Portable Hygrometer;Micro Power;Power ;SHT11;P89LPC922

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