用C51I/O口来驱动两个四位数码管，并且可消隐，降低功耗。

基于avr模拟电梯控制系统 包括源码电路图-Avr-based elevator control system consists of analog source circuit

设计了一个单片机的原理图，并制作了相应的PCB版图，测试后程序运行正常-Designed a microcontroller schematics and produce the corresponding PCB layout, test program runs normally

用NXP公司P89LPC9401单片机开发液晶显示,包括开发资料,各功能驱动程序.-NXP Single Chip P89LPC9401 company with the development of liquid crystal display, including the development of information, the function driver.

这是电容的制作图，我们可以用单片机作一个电容表，这样就可以测量一些没有标明的电容-This is the capacitance of the production of maps, we can use single-chip capacitance for a table, so that can be measured are not marked with the capacitance

本程序是下个双通道充电器的原程序,充两节NI-MH电池,-This procedure is the next dual-channel charger for the original procedure, two rechargeable NI-MH battery,

由C语言编写的模拟时钟,不需要时钟芯片即可准确显示-prepared by the C language simulation clock, clock chip can not accurately

LPC2103的第二个实验：流水灯+按键，用proteus7仿真，C语言代码，在Keil3中编译，文件内已有完整的工程和仿真图了。-The second experiment LPC2103: water lamp+ button, and proteus7 simulation, C language code, compiled at Keil3 in the paper that has a complete map of the engineering and simulation.

在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张， 于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却 发现仍然不够用，实在没办法了就添加一个IC 来扫键。一个IC 虽然价格不高， 但对于大批量生产而且产品利润低的厂家来说，这是一笔不菲的开支! 那，我们能不能想到比较好的扫键方法：用最少的IO 口，扫最多的键？可以吗？-Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?

介绍单片机外围电路设计的一本基础书，做电子设计的朋友不可或缺的资料。-Introduced single-chip peripheral circuits design based on a book, to do electronic design information indispensable friend.