Frequency-Meter

说明：  详细介绍基于C51的芯片FS8610的DLL文件调用函数，方便用户开发(Detail based on the C51 chip FS8610 call the DLL file function, user-friendly development)

1602液晶屏的驱动程序，已调试成功，可以使用，欢迎下载(1602 LCD driver, has been successful debugging, you can use, welcome to download)

自己写的一个带有松手检测和长按识别，短按识别，长短按区分的键盘扫描程序(Write your own keyboard scanner with a loosely detection and long-identification, press recognition, length according to the distinction)

关于数控恒流源的设计报告包含程序代码，原理图(About the numerical constant current source design reports contain program code, schematics)

Multisim10的DAC原理仿真演示。采用两个计数器级联成8位计数器，然后进行DAC转换。转换前后的结果分别用数码管和示波器显示。对理解DAC的原理非常有帮助。(This simulation contains two digital counters to generate 8-bit output to DAC, both digital number and analog values are dispayed. It is helpful to understand the principal of DAC.)

基于STM32F407的超声波模块测距，增量式编码器（1/30减速比）实时测速，PWM输出控制直流单机，并通过OLED显示实时数据，同时也通过串口打印(Based on STM32F407 ultrasonic module ranging, incremental encoder (1/30 deceleration ratio) real-time speed measurement, PWM output control DC single machine, and display real-time data through OLED, but also through serial port printing.)

C8051F120和C8051F130的基础例程源码，学习该系列单片机的号资料(C8051F120 and C8051F130 source based routine, learning the number of the MCU data)

lpc2138芯片，加lcd12864，两个一起实现显示的功能。(lpc2138 chip, plus lcd12864, two together achieve the display function.)

飞思卡尔MC9S08DZ60智能车的小车初始化中PWM的写定，便于新手在写智能车的初始化中利用和参考(Freescale smart car car MC9S08DZ60 PWM initialization writing given to facilitate the novice to write the initialization of the smart car use and reference)

说明：  51单片机串口通信模拟实验，串口通信入门。(51 SCM serial communication simulation experiment, serial communication introduction.)