此程序是利用51单片机，控制蜂鸣器接口高低电平，让其发出歌声。...

常用数据库包（pcb）组件。。。。。。。。。。。。。。。。。。

4对于进入密码锁的钥匙，假设复位后8个LED全亮，并使用sw1、sw2两个，然后sw2-> sw1-> sw1-> sw2，则表示解锁右侧会导致8个LED全暗。

功能：arm7平台的I2c驱动程序，硬件I2C软件包，利用中断方式操作。 * 说明：主程序要配置好I2C总线接口(GPIO、总线时钟)

通信工程系专业综合设计C51单片机的键盘去抖程序,-communications professional engineering design C51 microcontroller integrated keyboard Tremble procedures,

BTF020实验程序-1 btf020开发板自带-Experimental procedures BTF020 development board comes with-1 btf020

详细介绍RS-485/422原理与区别、元件选择、参考电路、通讯规约、程序设计等方面的应用要点，以及在产品实践中总结出的一些经验、窍门-Detail the difference between theory and RS-485/422, component selection, reference circuits, communications statute, procedures for the application of design elements, as well as practice in the products sum up the experience, know-how

用于MAX187的12位AD 转换程序,附带1602液晶驱动函数-For MAX187 12-bit AD conversion process, with 1602 LCD driver function

我自己整理的单片机4*4键盘最简扫描算法，相当精炼。-I sort of SCM 4* 4 keyboard the most simple scanning algorithm, very refined.

DMX通讯程序。用于控制LED的亮度。RGB三中颜色。-DMX communication procedures. Used to control LED brightness. RGB color III.

这是我自己写的18B20驱动程序，不需修改，做的温度计精度很高。大家在做温度采集明无需修改，只需添加上既可使用。-This is what I wrote it myself, 18B20 driver without modification to do high precision thermometer. We do no need to modify the temperature acquisition out, simply add the can use.