pid

说明：  OBD系统开发时OBD故障码解析，含大部分整车生产企业自定义的代码以及通用代码(OBD fault code parsing during the development of OBD system, including custom codes and general codes of most vehicle manufacturers)

Realtek最新的5口傻瓜交换机芯片RTL8305NB做的3口百兆交换机原理图、PCB图，以此为参考可以做5口交换机(Schematic and PCB Documents of 3 Ports switch.The main chip is RTL8305NB,which is the new 5 ports switch chip of realtek Co.Ltd.)

说明：  基于stm32F103C8 与AT24C64实现开机次数记录(Record the number of startup times based on stm32f103c8 and at24c64)

AT89S51demo代码，方便快速开发(AT89S51demo Code, Convenient and Rapid Development)

fluent物性随温度变化的udf（包括导热和比热）；边界条件温度随时间变化的udf。(fluent physical properties with temperature changes udf (including thermal conductivity and specific heat) temperature boundary conditions change over time udf.)

12864驱动程序（51串行）已通过检测，用时注意端口的定义(12864 Driver (51 serial))

微信公众平台第三方登录 .net 只需要修改appid appsecret等便可使用(third party login for weixin(.net))

说明：  用12864加STC12C5A60S2做的GPS解析(GPS Analysis with 12864 and STC12C5A60S2)

说明：  使用STM32实现AD8803的adc电压输出(ADC Voltage Output of AD8803)

　Hittite公司以创新的设计使得其PLL产品性能优异，在相位噪声，杂散方面有着卓越表现，其芯片的高集成度使得外围电路简单，设计方便。所以随着电子技术的发展，对频率源的相位噪声性能要求越来越高，Hittite的低相位噪声PLL，在物理、天文、无线电通信、雷达、航空、航天以及精密计量、仪器、仪表等各种领域里都将大有用武之地。(The Hittite companies with innovative design makes the PLL excellent product performance, the phase noise, spurious aspects with excellence, its high integration chip makes the peripheral circuit is simple and easy design. So with the development of electronic technology, phase noise performance of frequency source is more and more high, the Hittite low phase noise PLL, in physics, astronomy, radio communication, radar, aviation, aerospace and precision measurement, instruments, meters and other fields will be great.)