Such as the accuracy of frequency measurement based on the principle of design,...

着是基于51的电子密码锁，希望大家支持！！！！谢谢，以后多多交流-51 on the basis of the electronic code lock, I hope you will support! ! ! ! Thank you, after a lot of exchanges

单片机开发实例 很有用 是五十一的单片机 只要有c语言基础就可以上手-very good core really please true me

DS12CR887万年历四种程序(MOTOROLA）时序和(INTEL)时序，接1602液晶和12864液晶显示-Calendar DS12CR887 four procedures (MOTOROLA) timing and (INTEL) timing, then 1602 and 12864 LCD liquid crystal display

51实现TCPIP协议原理图-51 TCPIP achieve agreement schematics

RF24L01驱动程序---C51-RF24L01 driver--- C51

demo程序及开发板-demo procedures and development board

能实现功能有：显示年、月、日、星期、时、分、秒、阴历月日、温度，共21位数码管。其中星期和阴历月日能根据公历自动计算改变，到2050年之前有效。温度可以测量从-10到40℃之间的温度。还可以设定两个定时、12/24小时显示、自动亮暗切换的时间等。 电路只用了两片IC，一片M48，另外一片是74LS145，4-10译码器，来扩充端口。具体电路在下面，是PROTEUS画的，给个图片做参考-To achieve functions: Display year, month, day, week, hour, minute, second, lunar month, the temperature, a total of 21 digital tube. One week and the lunar month on the Gregorian calendar automatically calculated based on changes effective prior to 2050. Can measure temperatures from-10 to 40 ℃ temperature between. Also can set two time, 12/24 hour display, automatic light switch dark time. Circuit used for only 2 IC, an M48, the other is a 74LS145 ,4-10 decoder to expand the port. Specific circuit in the following is the PROTEUS painting, a reference to a picture

PIC18F4550_USB开发原代码，可以给需要用单片机开发USB通信使用参考-PIC18F4550_USB development of the original code, can require the development of USB communication using single-chip reference

LTC1446是一种采用12位逐次逼近式工作的A/D转换器。内部包含系统时钟、采样和保持、12位A/D转换器、数据寄存器以及控制逻辑电路。LTC1446每25uS重复一次“输入――转换――输出”。器件有两个控制输入：DIN CLK和片选（CS）。 内部系统时钟和DIN CLK可独立使用。应用电路的设计只需利用时钟启动转换或读出转换结果。当CS为高电平时， Dout处于高阻态且DIN时钟被禁止。

全国大学生电子设计大赛历年题目_Frily-National Undergraduate Electronic Design Contest calendar year subject _Frily