4*4键盘程序，来自msp430系列单片机

温湿度传感器驱动函数，IIC总线的，提供直接调用接口-Temperature and humidity sensor-driven function, IIC Bus, to provide direct call interface

NE5532+TDA2030 原理图及PCB-NE5532+ TDA2030 Schematic and PCB

SD卡的简单介绍，包括SD卡的分类，协议，脚位定义等。-SD card, a brief introduction, including the SD card classification, protocol, pin definitions.

St7920串口驱动12864 KeilV51很实用

三位半数字电压表程序，能测量-5~+5V电压，比较准确。-Three semi-digital voltage meter procedures to measure-5 ~+5 V voltage, more accurate.

开发硬件电路需要用到液晶显示模块1602的用户必备。调试实验源程序第三部分。-Hardware needed to develop liquid crystal display module 1602 required the user. The third part of the experimental source code debugging.

C51源程序库，一些例，学51单片机的基础用-C51 source database, a number of cases, the basis of study with 51 single-chip microcomputer

主要是关于A/D转换的程序，每一个我都试验过，非常好使-Mainly on the A/D conversion process, every test I have been very so

LIN总线的串行通信源程序 通过编译成功 -LIN-bus serial communication source code through the compiler successfully

节能充电器-Energy-saving charger