用AT89C2051实现程序A/D转换程序，用PWM模拟输出。

功能：编程实现简化Xmodem协议，为实现标准的Xmodem协议做基础-Function: XMODEM protocol to simplify programming for the realization of the standard XMODEM protocol as a foundation

PIC单片机的1602液晶显示，包括8位数据控制和4位数据控制-PIC MCU 1602 liquid crystal display, including the 8-bit data control and 4-bit data control

单片机的中断定时操作，详细介绍了c51中定时器设置和中断设置应用情况-SCM interrupted regular operations, detailing the decoder timer settings and installed applications interruption

单片机播放音乐 通过控制高低电平让蜂鸣器发出不同的声音 做相应的延时实现节拍 开发环境是keil-SCM music by controlling the high-low so that the buzzer sounds different delay accordingly to achieve the beat

基于C51的充气泵控制系统程序源码，可以实现精确控制-C51-based control system for inflatable pump source program, can achieve precise control

该时钟以24小时制显示时间，并可显示2000年至2049年之间的任何日期及星期，日期与时间经按键可相互切换，可输入8个闹钟时间设置，每个闹钟设置包括响铃的时间（小时与分钟）、对工作日有效还是对周末有效的标志，以及本项设置是否启用的标志等三部分。这8个闹钟设置均保存在EEPROM中，即使掉电也不用重新输入。-The 24-hour clock to display time, and shows from 2000 to 2049 and any date between the weeks, the date and time as may be mutually switch button, enter the eight alarm time settings, each set including the ringing of an alarm clock Duration (hours and minutes), the effective working days or weekends effective road signs, as well as whether or not to enable this setting, such as a symbol of three parts. This 8 alarm settings are stored in EEPROM, even brown-out do not have to re-enter.

学4年来做过的竞赛以及老师的科研项目所积累下来的c51源代码，一共有40-4 years of study done as well as the Teacher of the competition accumulated research c51 source code, a total of 40

PIC单片机控制时钟芯片DS1302汇编程序 Display 秒/分/小时/日期/月/日/年 -PIC SCM DS1302 clock chip assembler Display seconds/minute/hour/date/month/day/year

单片机常用的AD后滤波算法，供参考。-SCM common AD after filtering algorithm for information.