PWM

PIC红外测试程序，通过红外控制LED灯的亮灭。(PIC infrared testing procedures, through the infrared control LED light.)

说明：  基于51的温湿度检测，使用HDC1080实现(HDC1080 driver based on C51)

AT89C51+液晶显示屏，按输入字符输出相应的显示，源代码为C语言编写，希望对大家有帮助。(The LCD of AT89C51+ screen display output according to the input character, the source code is written in C language, we hope to help.)

使用STM32单片机开发的简易电子钟，并实现计时报时(A Simple Electronic Clock Developed with STM32 Single Chip Microcomputer)

电子密码锁，内有汇编程序及Protues仿真，已设计调试成功，供大家参考。(Electronic locks)

2相四线八拍步进电机程序，可以正转反转，加减速(2 phase four line 8 stepper motor)

elcirc三维环流模型，可以计算河流、河口、海洋、湖库等水流、温度、盐度输移(ELCIRC is an unstructured-grid model designed for the effective simulation of 3D baroclinic circulation across river-to-ocean scales. It uses a finite-volume/finite-difference Eulerian-Lagrangian algorithm to solve the shallow water equations, written to realistically address a wide range of physical processes and of atmospheric, ocean and river forcings. The numerical algorithm is low-order, but volume conservative, stable and computationally efficient. It also naturally incorporates wetting and drying of tidal flats. While originally developed to meet specific modeling challenges for the Columbia River, ELCIRC has been extensively tested against standard ocean/coastal benchmarks, and is starting to be applied to estuaries and continental shelves around the world.)

实现单片机演奏简单的声调乐曲，外连无源喇叭效果较好(Simple tonal music microcontroller played outside with passive speakers better)

音量控制芯片，六通道音量控制芯片，可单独和全控。(The volume control chip)

GSM Basics : Global System for Mobile Communications s a digital mobile telephony system that is widely used in Europe and other parts of the world.