GPIO

51的4乘4键盘锁液晶时钟程序 带键值锁定(51 4 x 4 keypad lock with a key lock LCD clock program)

该程序是基于51单片机的矩阵键盘程序，单片机采用对键盘行列分别扫描的方法，实现按键的检测。(The program is 51 microcontroller-based matrix keyboard program the microcontroller using the method of scanning the keyboard ranks to achieve the detection of key.)

说明：  STM32F407读nandflash串口上位机显示(STM32F407 Reads Nandflash Serial Port Display on PC)

BASIC ANROID AND COMMON PROGRAM

说明：  单片机做的万年历公历农历转换代码，用的C语言(SCM calendar Lunar calendar to do the conversion code, using the C language)

说明：  ADXL345基于stc51的测试文件，可读取ID，和x，y，z轴三个方向的角度以及加速度(Based on stc51 test file, adxl345 can read the angles and accelerations of ID, x, y, z axes)

说明：  AD5933模块负阻抗测试程序，C语言Keil编译(AD5933 Impedance Test Program)

适合初学者用的，对象编程。初学者交流之用。(Programming for beginners to use, object. A beginner.)

it is program for led matrix

240128c液晶屏的51单片机程序驱动，能实现刷屏功能。(240128c LCD screen 51 single-chip program driver, can achieve brush screen function.)