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YL_3串行数码管显示时钟，74HC595，8位，显示时分秒，自动计数。(YL_3 serial digital display clock, 74HC595, 8 bit display minutes and seconds, automatic counting.)

说明：  一个特别好的modbus从机扫描程序，可以以RTU或ASCII方式通信以此来检验下位机。(A particularly good modbus slave scanner can communicate with RTU or ASCII way to test this lower position.)

数字量-模拟量转换器，可以实现单片机处理的数字量信号转换成模拟量电压电流信号输出(Digital analog converter)

主要用于测试SIM300CZ拨打电话和MT8870程序,已测(Mainly used for testing SIM300CZ call and MT8870 procedures have been measured)

NPN silicon planar epitaxial transistor encapsulated in a SOT223 surface mounted envelope and designed primarily for use in hand-held radio equipment in the 470 MHz communications band.

单片机DS18B20测温功能模块　DS18B20数字温度传感器接线方便，封装成后可应用于多种场合，如管道式，螺纹式，磁铁吸附式，不锈钢封装式，型号多种多样，有LTM8877，LTM8874等等。主要根据应用场合的不同而改变其外观。封装后的DS18B20可用于电缆沟测温，高炉水循环测温，锅炉测温，机房测温，农业大棚测温，洁净室测温，弹药库测温等各种非极限温度场合。耐磨耐碰，体积小，使用方便，封装形式多样，适用于各种狭小空间设备数字测温和控制领域。.(DS18B20 digital temperature sensor MCU DS18B20 temperature measurement function module wiring convenience, packaged as can be applied to a variety of occasions, such as pipes, threaded, magnets, stainless steel package, a variety of models, LTM8877, LTM8874 and so on. Main changes its appearance depending on the applications. Package after the DS18B20 temperature measurement, can be used in the cable trench blast furnace water cycle temperature measurement, boiler temperature measurement, room temperature measurement, the agriculture greenhouse temperature measurement, temperature measurement of a clean room, the temperature measurement of the ammunition depot various temperature extremes occasions. Resistant to wear and touch, small size, easy to use package forms, suitable for a variety of the narrow space equipment digital temperature measurement and control field. .)

这是一款模拟modbus从机的程序，可以方便用户调试modbus程序，本程序完全免费。(This is a simulation of the modbus from machines, can facilitate users to debug the modbus program, this program is completely free. )

使用51单片机，用其内部定时中断，和外部中断只找一个可控脉宽调制信号PWM(Using 51, with its internal timer interrupt, and external interrupt only to find a controllable pulse width modulation signal PWM)

使用读卡器实现了为个人化的IC卡数据读写(Achieved using the reader for personal IC card data read and write)

128KHzID卡读卡模块程序，带模块原理图，曼切斯特解码(128KHzID card reader module program with block diagram, Manchester decoding)