51单片机定时器的计算，输入晶振及定时值，就能得到定时器的初值-51 Calculation of single-chip timer, enter the crystal and from time to time the value of the timer can be the initial value

Online tic-tac-toe. You can play tic-tac-toe over a network with the another user. It has a graphical user interface.

利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。-AT89S51 microcontroller using T0, T1 of the timer counter functions, to complete the input signal frequency count, counting the frequency of the res

89C52单片机的三个定时器同时使用，能在一秒内准确定时，测量脉冲的频率，同时用串口发送PC机。-89C52 microcontroller three to be used simultaneously, can be accurate within a second time, measuring the frequency of the pulse, while sending a PC with a serial port.

双片595n驱动六位数码管，结合DS1302用数码管显示时分秒，经过30秒切换年月日，10秒换回。附带调时间的功能。-Two-piece 595n drive six digital tube, combined with the DS1302 digital display minutes and seconds, after 30 seconds after the switch date, in exchange for 10 seconds. Incidental adjustment