奉献：485 [日期：2005

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?

介绍了一种基于MCS251 系列单片机的温度测控电路。可对外界温度进行测 量、误差修正、判定传感器故障与高温报警, 并具有键盘控制和警情通讯显示功能。-VERY GOOD

单片机与电脑一体机数据传送的接收部分.请多多支持-Single-chip machine and computer to receive data transmission part.

单芯片电子称重方案，包括代码和原理图，文档

使用微芯公司的PIC8F458单片机，用C语言实现B口电平变化中断程序，并且在中断中用C实现步进电机的驱动程序。-The use of Microchip

状态1：正常时，8个LED发光二极管（彩灯）循环点亮。 • 状态2：有报警时，蜂鸣器发出报警声（用P3.3接一个按键，模拟产生报警信号。当开关合上，发生报警；当开关断开，报警停止。用P3.7输出音频信号驱动扬声器，作为报警信号），同时8个LED发光二极管（彩灯）闪烁。 P3.2接一个按键，用于消除报警-Status 1: normal, eight LED light-emitting diodes (lantern) light cycle.

这是MICROCHIP 的PIC 系列单片机常用 的C语言编译器。特别对PIC16F877系列 特别好用。-It is C compiler for PIC of MICROCHIP,especially for PIC16F877,it is very good!

访问PS/2键盘接口

用SPCE061A控制两个电机画任意直线的程序。 -SPCE061A controlled by two motors draw a straight line of arbitrary procedures.

这个是实时时钟芯片DS1302的驱动程序，采用c51编写，编程时只需要修改一下SCL,IO,RST的引脚定义即可，经过测试，完全好用-This is a real-time clock chip DS1302 driver, using C51 preparation, programming, only need to modify about SCL, IO, RST pin can be defined, tested and fully use