16字 LED点阵屏+DS1302电子钟 C 程序 1 脚接+5V 2，3脚32768HZ晶振 4脚接地 5脚接S51的P02 6脚接S51的P01 7接S51的P00 8脚接后备电源，可以接老计算机主板上的3.6V电池，也可以通过二级管隔离接一个大容量电解电容 电压在2.5V以上即可维持 595连级输出数据，138行驱动 P1_0为时钟模式转换键、P2_1为时钟加键、P1_2为时钟减键、P2_3为时钟复位键。在对时钟调整时未对调整 项做闪烁处理,16-chara

此汇编程序实现A/D转换功能，应用于pic单片机上，A/D采用中断方式。该程序通过单片机的RA2模拟通道送入一直流电压，当送入的直流电压大于2.5V时，8个LED闪动，当直流电压恢复到2.5V以下时，LED停止闪动。为了防止干扰，本程序对直流电压采样10次后再作判断，中间的采样结 果用间接寻址的方式存取。-Assembler implementation of this A/D conversion function, applied on pic Singlechip, A/D interru

本例在设计时采用了ADO.net访问数据库的技术，前台用VB.net2008作为开发工具，后台数据库采用了SQL server2005，然后通过前台对各项数据进行日常操作-In this case were used in the design of ADO.net database access technology, the future use VB.net2008 as development tools, back-end database using SQL server2005,

Security is a prime concern in our day-today life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The microcontroller based Door locker is an access control system that allows only