基于ATmega48单片机的恒速风扇控制器的设计
上传时间: 2013-10-27
上传用户:baitouyu
基于单片机的语音公交报站器的开题报告
上传时间: 2013-10-21
上传用户:顶得柱
介绍一种基于单片机控制的数控直流电流源。系统以AT89S52单片机为控制核心,由V/I转换电路、DA转换、AD转换等模块组成。通过按键设定电流值,并在LCD上同步显示预设值,利用模拟闭环控制原理实现V/I转换功能,采样电阻两端的电压值送给A/D转换电路,经单片机换算成实际输出电流值,并利用LCD显示,供用户参考。经测试,本系统稳定性好、精度较高、操作简单、人机界面友好。在科学研究和设备生产中,能够广泛应用到这种可靠性高、操作简单的数控电流源,不仅能够提高设备的性能,同时能够缩短研发周期,本系统具有较高的实用性。
上传时间: 2013-11-06
上传用户:csgcd001
数字控制的交流调速系统所选用的微处理器、功率器件及产生PWM波的方法是影响交流调速系统性能好坏的直接因素。在介绍了正弦脉宽调制(SPWM)技术的基础上,设计了一种以8098单片机作为控制器,以智能功率模块IPM为开关器件的变频调速系统。通过软件编程,产生正弦脉冲宽度调制波形来控制绝缘栅双极晶体管的导通和关断,从而达到控制异步电动机转速的目的。实验结果表明,该系统可调频率调电压,稳定度高,调速范围宽,具有较强的实用价值 Abstract: AC variable speed with digital control systems used microprocessors, power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology,this paper designed variable speed system which used 8098 as a controller, intelligent power module IPM as switching device. Through software programming, resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off, so as to achieve the purpose of speed control of induction motors. Experimental results show that the system can adjust frequency modulation voltage, high stability, wide speed range, has a strong practical value.
上传时间: 2013-11-14
上传用户:ynwbosss
针对科研实验中对拉压千斤顶加载过程控制的需要,采用ATmega128单片机控制步进电机进而实现对执行系统的电动泵站实行自动控制。对力和位移的数据采集与处理及用步进电机控制电动泵站手柄的技术细节作了重点描述。通过单片机的A/D变换器对AMP放大模块采集的电桥信号作量化处理,千斤顶的操控手柄位置依电动油泵阀门开启的方向和大小作若干定位,单片机根据力或位移传感器信号,实时控制步进电机驱动手柄旋转到相应操控位置。 Abstract: This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing, and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge, jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals, real-time control stepper motor drive control handle rotate to the appropriate location.
上传时间: 2014-01-16
上传用户:hasan2015
为提高电容测量精度,针对电容式传感器的工作原理设计了基于PIC16LF874单片机电容测量模块。简单阐述了电容测量电路的应用背景和国内外研究现状,介绍了美国Microchip公司PIC16LF874单片机的特性。电容式传感器输出的动态微弱电容信号通过PS021型电容数字转换器把模拟量数据转换成数字量数据,所测数据由PIC16LF874单片机应用程序进行处理、显示和保存。实验结果表明,固定电容标称值为10~20 pF 的测量值相对误差在1%以内,同时也可知被测电容容值越大,测量值和标称值相对误差越小。 Abstract: To improve the accuracy of capacitance measurement,aimed at the principle of work of mercury capacitance acceleration transducer,the design of micro capacitance measurement circuit is based on the key PIC16LF874 chip. Briefly discusses the application of the capacitance measuring circuit for the background and status of foreign researchers,focusing on the United States PIC16LF874 microcontroller features. Capacitive sensor outputed signal through the dynamics of weak PS021-chip capacitors (capacitancedigital converter) to convert analog data into digital data,the measured data from the PIC16LF874 microcontroller application process, display and preservation. Experimental results show that the fixed capacitor 10pF ~ 20pF nominal value of the measured value of relative error is within 1%,but also it canbe seen the value of the measured capacitance larger,measuring value and the nominal value of relative error smaller.
上传时间: 2013-10-29
上传用户:wojiaohs
提出一种基于凌阳单片机的步进电机加减速的控制方法。采用凌阳科技推出的16位结构工控单片机SPMC75F2413A为控制器,由Allegro公司生产的两相步进电机专用驱动器件SLA7042M构成步进电机的驱动电路,在传统的3段直线加减速控制算法基础上增加至7段S形曲线加减速过程,控制步进电机的启动和停止。实验结果表明,该控制方法克服了直线加减速中不连续、易造成系统冲击的问题,整个系统实现柔性控制,电机启动、停止连续性能提高30%。 Abstract: The method of controlled stepping motor is referred based on SPMC75F2413A MCU, which adopts the 16 knots SPMC75F2413A MCU as the controller. The special-purpose actuation chip SLA7042M of two stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of stepping motor. The experimental results show that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control, and the performance of motor start or stop continuity is increased 30%
上传时间: 2013-12-08
上传用户:jiangfire
设计一种基于ATmega16L单片机的温度控制系统,阐述该系统的软硬件设计方案。采用模块化设计方法,利用增量式PID算法使被控对象的温度值趋于给定值。实验结果表明该系统具有良好的检测和控制功能。 Abstract: This paper designs a temperature control system based on ATmega16L,describes the hardware and software de-sign scheme of the system,adopts the modularized design method and utilizes the incremental PID algorithm to realize the temperature of controlled device incline to the given value.The experiment result indicates that the system has good detec-tion and control function
上传时间: 2013-10-09
上传用户:stvnash
前言 单片机是一门实践性很强的课程,实验是教学中非常重要的环节。为了适应教学的需要,我们编写了这本5013S单片机原理及应用实验指导书。 本实验指导由软件实验和硬件实验两部分组成。第一部分包括系统功能简介、键盘监控使用简介等方面的内容,旨在使学生对实验系统有大致全面的了解,掌握实验设备的使用方法,熟悉微机实验系统的结构、硬件连接方式。第二部分包括软件实验和硬件实验内容,实验项目完整丰富,与课堂教学紧密结合,充分激发了学生的动手及思维能力,有效提高了实验效率、实验成功率和教学质量。 本实验指导由王玉巧编写,吕运朋主审,在编写过程中得到了院长的精心指导,电子专业教研室的同志也给予了大力相助,由于编写时间仓促,难免出现个别问题,希望各位专家多给予批评指正。
上传时间: 2013-10-28
上传用户:leesuper
1.与众不同的特点 (1)P87C51、P89C51、属于增强型的80C51系列单片机,而AT89S51、W78E51、HY97C51等单片机则属于MCS-51系列单片机。尽管两者完全兼容,相比之下。AT89S51、W78E51、HY97C51、仅仅只有2个定时/计数器,一旦客户需要用到定时/计数器2,即便客户的程序没有超出4K范围,如果客户还是继续选择这些公司的单片机,那么客户只有选择成本更高的AT89S52、W78E52、HY97C52等单片机。而PHILIPS的P87C5、1P89C51有3个定时/计数器所以有很多客户知道PHILIPS单片机的这个特性,于是就一步到位选择了P87C51或者P89C51单片机,成本得到了大大的降低,由此可以看出PHILIPS通过改进设计提高了增强型80C51的性价比。
上传时间: 2013-10-21
上传用户:refent