【導讀】該課題對空氣的濕度進行研究，采用單片機和濕度模塊組成的濕度控制系統(tǒng)，對環(huán)境的濕度進行數(shù)據(jù)采集、處理。系統(tǒng)通過測量當前環(huán)境的絕對濕度，及時、精確地了解空氣濕度的變化，并將當時絕對濕度值與預設(shè)的上下限值進行比較，如果不在合適的空氣濕度范圍內(nèi)，系統(tǒng)會自動發(fā)出報警。本設(shè)計具有控制方便、組態(tài)簡單和靈活性大等優(yōu)點。過去，面對突如其來的變化，如溫度、濕度的變化，我們束手無策。3．當環(huán)境濕度低于或者高于設(shè)置濕度時啟動報警。空氣濕度是指空氣潮濕的程度，可用相對濕度表示。相對濕度是指空氣實際所含水蒸氣密度和同溫下飽和水蒸氣密度的百分比值。絕對濕度是一定體積的空氣中含有的水蒸氣的質(zhì)量，一般其單位是克/立方米。絕對濕度的最大限度是飽和狀態(tài)下的最高濕度。2．采用3位數(shù)碼管進行濕度顯示；

　　

【正文】 ents constitute a single system. They freed the design of the circuit unit dedicated to system design, greatly liberating the productive forces of science and technology, promote the wider spread of electronic systems. Semiconductor integrated circuits in the basic digital logic circuits first breakthrough. A large number of digital logic circuits, such as gates, counters, timers, shift registers, and analog switches, parators, etc., for the electronic digital control provides excellent conditions for the traditional mechanical control to electronic control. Power electronic devices and sensor technology to make the original to the radio as the center of electronic technology turned to mechanical engineering in the field of digital control systems, testing in the field of information collection, movement of electrical mechanical servo drive control object. Semiconductor and integrated circuit technology will bring us a universal age of electronic technology, wireless technology as the field of electronic technology a part of. 70 years into the 20th century, large scale integrated circuit appeared to promote the conventional electronic circuit unitspecific electronic systems development. Many electronic systems unit into a dedicated integrated devices such as radios, electronic clocks, calculators, electronic engineers in these areas from the circuit, the system designed to debug into the device selection, peripheral device adapter work. Electronic technology, and electronic products enriched, electronic engineers to reduce the difficulty, but at the same time, radio technology, electronic technology has weakened the charm. The development of semiconductor integrated circuits classical electronic systems are maturing, remain in the large scale integrated circuit other than the shrinking of electronic technology, electronic technology is not the old days of radio fun times and prehensive engineering training.Third, from the classic era of electronic technology to modern electronic technology of the times 80 years into the 20th century, the century of economic change is the most important revolution in the puter. The puter revolution in the most important sign is the birth of the puter embedded applications. Modern puter numerical requirements should be born. A long period of time, is to develop the massive puter numerical duty. But the puter shows the logic operation, processing, control, attracting experts in the field of electronic control, they want development to meet the control object requirements of embedded applications, puter systems. If you meet the massive dataprocessing puter system known as generalpurpose puter system, then the system can be the embedded object (such as ships, aircraft, motorcycles, etc.) in a puter system called the embedded puter. Clearly, both the direction of technology development are different. The former requires massive data storage, handling, processing and analysis of highspeed data transmission。 while the latter requires reliable operation in the target environment, the external physical parameters on highspeed acquisition, analysis and processing logic and the rapid control of external objects. It will add an early generalpurpose puter data acquisition unit, the output driver circuit reluctance to form a heat treatment furnace temperature control system. This generalpurpose puter system is not possible for most of the electronic system used, and to make generalpurpose puter system meets the requirements of embedded applications, will inevitably affect the development of highspeed numeric processing. In order to solve the contradiction between the development of puter technology, in the 20th century 70s, semiconductor experts another way, in full accordance with the electronic system embedded puter application requirements, a microputer39。s basic system on a chip, the formation of the early SCM (Single Chip Microputer). After the advent of single chip in the puter industry began to appear in the generalpurpose puter systems and embedded systems the two branches. Since then, both the embedded system, or generalpurpose puter systems have been developed rapidly. Although the early generalpurpose puter converted the embedded puter systems, and real embedded system began in the emergence of SCM. Because the microcontroller is designed specifically for embedded applications, the MCU can only achieve embedded applications. MCU embedded applications that best meet environmental requirements, for example, chiplevel physical space, largescale integrated circuits lowcost, good peripheral interface bus and outstanding control of instruction. A puter system microcontroller core, embedded electronic systems, intelligent electronic systems for the foundation. Therefore, the current single chip electronic system in widespread use of electronic systems to enable rapid transition to the classical modern intelligent electronic systems.4, single chip to create the modern era of electronic systems A microcontroller and embedded systems Embedded puter systems from embedded applications, embedded systems for early generalpurpose puter adapted to the object system embedded in a variety of electronic systems, such as the ship39。s autopilot, engine monitoring systems. Embedded system is primarily a puter system, followed by it being embedded into the object system, objects in the object system to achieve required data collection, processing, status display, the output control functions, as embedded in the object system, embedded system puter does not have an independent form and function of the puter. SCM is entirely in accordance with the requirements of embedded system design, so SCM is the most typical embedded systems. SCM is the early application of technical requirements in accordance with the design of embedded puter chip integration, hence the name single chip. Subsequently, the MCU embedded applications to meet the growing