graphics

该程序是本人用AVR ATtiny13写的的一个只用4个IO口驱动两相四线制步进电机的程序，还可以控制转动的上下限（祥见程序屏蔽部分）对使用两相四线步进电机的初学者来说无疑是一笔珍贵的学习资源，对要求以最低成本驱动两相四线步进电机的使用者来说，更是提供了一个有利的参考。推荐！(I use the program is written in AVR ATtiny13 a four IO only I drive two-phase four-wire stepper motor program, but also can control the rotation of the upper and lower limits (祥见shielding part of the procedure) on the use of two-phase four-step beginners into the motor is undoubtedly a valuable learning resource for the lowest cost drive requires two-phase four-wire stepper motor users are provided a favorable reference. Recommended!)

《51系列单片机设计实例》配套光盘中的实例11，北航出版社出版(err)

说明：  stm32FOC电机控制程序，使用FOC2.0的库，通过配置后可用于无刷直流电机、永磁同步电机矢量控制(STm32FOC motor control program, using FOC2.0 library, can be used for brushless DC motor, permanent magnet synchronous motor vector control after configuration.)

本报告介绍了基于AT89S52单片机为核心的、以AD0809数模转换芯片采样、以1602液晶屏显示的具有电压测量功能的具有一定精度的数字电压表。在实现基础功能要求之上扩展了串口通讯、时钟功能、高压报警、短路测试、电阻测量、交流电压峰峰值和周期测试等功能，使系统达到了良好的设计效果和要求。( This report describes on AT89S52 microcontroller as the core, to AD0809 DAC chip sampling, digital voltmeter with a certain precision voltage measurement function has LCD display with 1602. On the basis of the functional requirements to achieve extended serial communication, clock function, high pressure alarm, short circuit testing, resistance measurement, AC voltage peak value and cycle testing and other functions, allowing the system to achieve a good performance and design requirements. )

to overcome the harmonic To understand the different ways to mitigate voltage sags, distortion during mitigation process. In this study, the DVR various factors contributing to the problem have to be system is simulated using PSCAD software. This device will be connected in series to the

实时闹钟.1、STM32的实时时钟（RTC）是一个独立的定时器！ 2、RTC模块和时钟配置系统（RCC_BDCR寄存器）是在后备区域，即在系统复位火从待机模式唤醒后RTC的设置和时间维持不变。 RTC这章中，对RTC相关的寄存器的操作特别重要，(RTC Alarm real-time clock timer; keyer; intervalometer; timing device clock; timepiece allocation; configure; collocation; deploy register; tell-table; temporary storage reserve; in support system resetstandby mode awaken; awakening; arouse; rouse; wake up stand)

本设计主要实现用按键控制步进电机四相单拍、四相双拍和四相八拍三种方式切换， 正、反转及其加、减速，并能在LCD上显示其运行状态（速度和转向）。(The design of the main keys to achieve control of stepper motor with a single shot four-phase, four-phase two-and four-phase eight-shot shoot three ways to switch Positive, reverse its acceleration, deceleration, and in its operational status on the LCD display (speed and steering).)

freetype2在lcd上写字，对freetype2字体显示的布局封装库(支持汉字)(freetype2 on lcd write, package library of font layout is with freetype2 (support Chinese characters))

某贸易中心共10层，设有载客电梯1部。为了处理问题的方便，有以下的限定条件： 　　（1） 电梯的运行规则是：可到达每层。 　　（2） 每部电梯的最大乘员量均为K人（K值可以根据仿真情况在10~20人之间确定）。 　　（3） 仿真开始时，电梯随机地处于其符合运行规则的任意一层，为空梯。 　　（4） 仿真开始后，有N人(>20人)在该国际贸易中心的1层，开始乘梯活动。 　　（5） 每个人初次所要到达的楼层是随机的，开始在底层等待电梯到来。 　　（6） 每个人乘坐电梯到达指定楼层后，再随机地去往另一楼层，依此类推，当每人乘坐过L次（L值可以根据仿真情况在3~10次之间确定）电梯后，第L+1次为下至底层并结束乘梯行为。到所有人结束乘梯行为时，本次仿真结束。 　　（7） 电梯运行速度为S秒/层（S值可以根据仿真情况在1~5之间确定），每人上下时间为T秒（T值可以根据仿真情况在2~10之间确定）。 　　（8） 电梯运行的方向由先发出请求者决定，不允许后发出请求者改变电梯的当前运行方向，除非是未被请求的空梯。(a total of 10 layers, with a passenger elevator. To address the issue of convenience, have the following qualifications : (a) lift the operating rules is : can be reached on each floor. (2) each lift crew of the largest volume of all K (K value can be based on the simulation of the 10 to 20 between determined). (3) simulation at the beginning, randomly located in the lift line with its rules of operation arbitrary layer of air staircase. (4) simulation began, a N (gt; 20) at the International Trade Center in one layer, started by ladder activities. (5) Each person must first reach the floors are random, in the bottom wait for the elevator arrived. (6) Each person taken the lift arrived at the designated floor and then another random foot to the floor, and so on, when each rode L (L value c)

R134a汽车空调循环计算 输入：蒸发温度 冷凝温度 过热度 过冷度(R134a automotive air-conditioning cycle calculation input: evaporator superheat temperature condensation temperature cooling degree)