基于ATmega128L单片机的数字式RLC测量仪 毕业论文.doc

玉林师范学院本科生毕业设计 基于ATmega128L单片机的 数字式RLC测量仪 The Digital RLC Measuring Instrument Based on ATmega128L Microcontroller 院 系 电子与通信工程学院 专 业 电子信息科学与技术 班 级 2009级2班 姓 名 学 号 200905402223 指导教师单位 电子与通信工程学院 指导教师姓名 指导教师职称 讲 师 基于ATmega128L单片机的数字式RLC测量仪 摘要 随着智能化和数字式测量仪表的发展，智能化测量仪表得到了越来越广泛的应用，设计数字化的仪器已成为市场需求。本设计是根据单片机测出RLC电路的输出频率，然后对电阻、电感、电容三大基本电子元件进行测量，而且利用继电器进行自动换挡测量。其基本原理是以ATMEL公司的8位高速低功耗单片机ATmega128L为控制核心，通过相应的电子电路将电阻值、电感值、电容值均转换成频率值，利用单片机的内部计数器进行测频，然后通过程序运算计算出待测元件的数值送往12864液晶屏上显示。本设计系统电路包括电源电路，单片机系统电路，RLC测量电路，自动测量电路，液晶显示电路。本设计测量的电阻范围为10Ω-10MΩ，精度为±2％；测出的电容范围为100pF-100uF,精度为±3％；测出的电感范围为10uH-10mH，精度为±5％。本设计作品有操作方便，准确度高等优点。 关键词: 单片机，RLC测量，自动换挡 The Digital RLC Measuring Instrument Based on ATmega128L Microcontroller Electronic Information Science and Technology 2009-2 ZhengYong Supervisor ZhengJin-cun Abstract With the development of intelligent and digital measuring instruments, intelligent measuring instruments has been widely applied. Therefore, the design of digital instruments has become a market demand. This design can measure the resistor, inductor, capacitor which are the three basic electronic components based on the output frequency of RLC circuit measured by the single chip microcomputer. And this is completed through the automatic transmission measurement by relays. The basic principle is: with ATmega128 being the controlling core , which is the 8 bits high-speed and low-power microcontroller of ATMEL company, convert the resistance, inductance, capacitance values into the relative frequency values through the corresponding electronic circuit, and use MCU internal counter for frequency measurement. Then display the numerical value of the components to be tested on the 12864 LCD screen through the procedural arithmetic. This system circuit design includes power circuit, microcontroller system circuit, RCL measurement circuit, automatic measurement circuit and LCD display circuit. The scope of resistance measurement of this design