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说明：  本人编写的一段小程序，单片机通过8255a扩展端口，实现3*8=24路低频脉冲信号的测量，采用的特别的软件算法，具有使用价值。通过串口和上位机通信。(this is a small source code i have written. i use 8255a to rich ports for MCU in order to measure 24 ways of impulse. it is practically in use.)

在proteus中关于单片机的编程的例程(In proteus about microcontroller programming routines)

EM78P153中文资料，此文件如有侵权行为请通知删除，文件正确性请以芯片厂商的资料为准，些文档供学习参考(EM78P153Chinese data, this file if any infringement please inform delete files, correct please to chip manufacturer data shall prevail, some documents for learning reference)

stm32 dma 和串口接收大数据的处理(STM32, DMA and serial receive large data processing)

基于stm32USB模拟鼠标移动，演示用键盘的S1,S2,S3,S4模拟鼠标的上下左右移动。(Based on stm32, USB mouse, demonstration of the keyboard S1, S2, S3, S4 simulated mouse from top to bottom and move around.)

电路模块表面组装技术(上)，介绍SMT的组装和检测技术以及相关重要知识。(Circuit module surface mount technology (on), introduced SMT assembly and testing technology and related critical knowledge.)

MQ137资料，包括特点、适用环境、测试电路(mq137)

利用组态王软件实现的一个串级水箱控制系统(Kingview use the software to achieve a water cascade control system)

pic 18f97j60 uart code

HMC5883L测试程序，MCU为AT89S52，经测试可用(HMC5883L testing procedures, MCU for AT89S52, have been tested)