Buzzer buzzer ring to change the frequency by changing the delay time if the buz...

使用89S52为核心做的USB键盘,注意修改了一下windows设备描述符以及端点处理等就行了。用了一个4*4的小键盘,有0-9十个数字键, Num Lock键,Caps Lock键,Shift键,Ctrl键,Alt键,回车键等。 最多可以有三个键同时按下，如果相交的话，最多只能两个键按下-89S52 use as the core of the USB keyboard to do, pay attention to modify the look and the windows device descriptor, such as treatment endpoint on the list. Used a 4* 4 small keyboard, has the number keys 0-9 10, Num Lock keys, Caps Lock key, Shift key, Ctrl key, Alt key, enter key and so on. Can have up to three keys pressed at the same time, if the intersection, then a maximum of only two keys pressed

16×2 LCD模块显示例程，供需要的人参考-16 × 2LCD module routines for those who need it for reference

51单片机上的LCD1602驱动，相关的LCD驱动可以在我发布的其它驱动中找到。-51 MCU on the LCD1602 driver, LCD driver can be related to the other drivers I have found.

高速flash AT45db041B驱动程序。msp430f149+at45db041b,包括源件和项目文件。-high-speed flash AT45db041B driver. Msp430f149 at45db041b, including the source documents and project documents.

conver hull prgram dds

写单片机的可以看看17种使用的小软件这是1-RUANJIAN

直流电机测速程序 电机需带码盘 精度高 可直接设置转数 短时间内电机达到所设定的 速度-DC Motor Speed procedures required motor encoder with high precision can be set directly to a few short period of time to achieve the set motor speed

89c52编写智能化开关电源设计，带A/D,D/A识别全数字开关电源程序。-89c52 prepare intelligent switching power supply design, with A/D, D/A to identify an all-digital switching power supply procedures.

用定时器和控制端口,定时扫描,实现多种流水效果-With timer and control of ports, timing scan, to achieve a variety of water effects

利用52单片机通过8254定时器实现控制电机的PWM调速程序，可实现开始，停止，加速，减速。-8254 through the use of 52 single-chip motor control timer PWM speed control process, can realize the start, stop, acceleration, deceleration.