bisai

pat advanced level 1005. Spell It Right(Given a non-negative integer N, your task is to compute the sum of all the digits of N, and output every digit of the sum in English. Input Specification: Each input file contains one test case. Each case occupies one line which contains an N (<= 10100). Output Specification: For each test case, output in one line the digits of the sum in English words. There must be one space between two consecutive words, but no extra space at the end of a line. Sample Input: 12345 Sample Output: one five)

msp430f169读写SD卡，文件系统是FAT16(msp430f169 SD card reader, the file system is FAT16)

光伏电池阵列输出功率受光照强度和温度变化的影响，因此最大功率点跟踪（MPPT）技术广泛应用于光伏系统中。在所有最大功率点(MPP)控制策略中，扰动观察（P&O）MPPT算法因易实现被广泛应用，然而它的缺点是在稳定工作状态下工作点通过MPP 时会导致能量振荡损耗，并且在光照强度或温度发生突变时表现较差的动态响应。在本文中，提出一种改进型变步长扰动观察MPPT 算法，此方法依据工作点动态调整步长变化，与传统固定步长方法比较，本文提出的方法(Photovoltaic array output power is affected by light intensity and temperature change, so the maximum power point tracking (MPPT) technique is widely used in light volt system.In all of the maximum power point (MPP) control strategy, the disturbance observation (P&O) MPPT algorithm is widely used because of easy to implement, but its drawback is that under the steady working state working point by MPP will cause energy loss of oscillation, and the mutations in poor light intensity and temperature of dynamic response.In this article, the paper puts forward a modified variable step disturbance observation MPPT algorithm, this method is based on the working point dynamic adjustment step change, compared with the traditional fixed step length method, the proposed approach)

基于STM32F103单片机的PWM测试源码(PWM test source code based on STM32F103 MCU)

SDL2_image-2.0.0开发包，方便大家使用(SDL2_image-2.0.0 Development Kit to facilitate the use)

说明：  T9拼音输入法实验，9键输入法程序，算法优良(T9 Pinyin Input Method Experiments)

学习光盘（HC6800）单片机源码包括液晶显示、按键控制、AD转换、串口通信等。(Learning CD-ROM (HC6800) microcontroller source including liquid crystal display, button controls, AD converter, serial communications.)

网上找的华兄电子SHT20温湿度传感器驱动程序，经修改，在原子开发板上调试成功。可准确读取温度和湿度。编译环境为Keil MDK ARM 5.14(Modified SHT20 driver source code of Huaxiong electronic. Successed run in atomic development board, can read the temperature and humidity. Compiled by Keil MDK ARM 5.14.)

Connect LCD to LPC1788

protues 红外线仿真 包含源码 hex文件 (protues infrared simulation)