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实现对气体流量表的基于音速喷嘴的自动检定(testing for the gas flow meters based on stangdard acoustic nozzles)

该程序为初学者学习单片机时使用的60S倒计时程序，可将开程序用在proteus软件上进行仿真，我试过可行的~(The program for beginners to learn the use of single-chip microcomputer of the 60S countdown procedures, can be used in open procedures proteus simulation software, I tried to possible ~)

c51单片机的sle4442卡的读写加密验证程序 已通过(c51 microcontroller sle4442 card reader encrypted authentication procedure has been adopted)

串口通信传输与接收。既：发送一个字节到MCU,再由MCU发回来。(Serial communication transmission and reception. Bothto send a byte to the MCU, and then sent back by the MCU.)

MC9S12XEP100的程序，适合中低级程序员练习(MC9S12XEP100 program, suitable for junior programmers to practice)

IR decoding digital display

采用TI LaunchPad开发板触摸屏控制DAC7611输出电压(TI LaunchPad development board using the touch screen controls DAC7611 output voltage)

SD卡2.0协议的详细资料，可用与SPI使用(The details of the SD card 2.0 protocol can be used with SPI)

hantek3064仪表上位机监控的示例程序，仅供大家参考(hantek3064 Meter PC monitoring sample program, only for your reference)

驱动步进电机，旋转多次，寻找空间光强极大值初步程序(Drive stepper motor rotation several times to find space intensity maxima preliminary program)