基于单片机的手持测量仪的设计硬件部分毕业设计论文.doc

PAGE 56 PAGE V 基于单片机的手持测量仪的设计（硬件部分） 摘 要 近年来，随着计算机和通信技术的飞速发展，单片机产品已经成为了信息产业的重要分支，单片机系统技术也成为目前电子产品设计领域较为热门的技术之一，目前已经广泛地应用于军事国防、消费电子、网络通信、工业控制等各个领域。本文主要讨论下单片机在手持测量方面的应用。传统测量系统具有比较复杂、功能单一、价格昂贵等缺点，而基于单片机的手持测量仪具有体积小、功耗低的优点。随着单片机系统的功能不断加强，基于单片机的集成测量系统也得到了广泛应用，手持式测量仪已经在工业、农业和普通个体户等各个不同的领域得到广泛的应用。发展体积小，功耗低的便携式手持测量系统显得非常必要，而且十分迫切。另外传统单一功能的测量仪已经不能满足人们的需要，人们更加希望多种功能能集成在同一个测量仪上，因此多功能手持式测量仪的设计生产将是今后的主流，而简单、便捷是设计师不断挑战的重要因素。 本文主要介绍基于STC12LE5A60S2芯片的手持测量仪的设计，其中涉及的参量包括距离、温度、湿度、噪声。通过HC-SR04超声波测距传感器，DHT21温湿度传感器和噪声模块对环境参数采集，利用按键模块于LCD1602显示器上进行切换显示，并且对超过设定的参数值进行报警。该单片机芯片具有低功耗x休眠特点，所以设计时当系统一段时间不工作，则马上进入休眠状态，有效的节省了电源电量。 关键字：单片机，距离，温湿度，噪声，低功耗 MCU-based design of hand-held measuring instrument(hardware part) Abstract In recent years, with the rapid development of computer and communication technologies, single-chip products has become an important branch of the Information Industry, the MCU system technology has also become one of the more popular technology for the field of electronic product design has been widely used in military and national defense.consumer electronics, network communications, industrial control fields. This article focuses on the application under the MCU in the handheld measurement. The traditional measurement system has a more complex, single function, and expensive, and microcontroller-based hand-held measuring instrument has the advantages of small size, low power consumption. Continue to strengthen the functionality of the MCU system, the microcontroller-based integrated measurement system has also been widely used hand-held measuring instrument has been widely used in different areas of industry, agriculture and ordinary self-employed. Development of small size, low power consumption, portable handheld measurement system is very necessary and very urgent. Other traditional single-function measuring instrument has been unable to meet the needs of people, people more hope to a variety of functions can be integrated on the same measuring instrument, multi