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一种实现载波监听多点接入／冲突检测的多主RS485总线-A carrier sense realize multi-point access/Collision Detection RS485 multi-master bus

单片机 时钟程序,包含秒表，闹钟，时间三个功能-MCU clock.c

液晶显示器LCD1602的驱动。适合于51单片机系统。-LCD1602 LCD driver. Suitable for single-chip microcomputer system 51.

绝对好用的I2C和USBSWITCHTO232 绝对好用的I2C和USBSWITCHTO232-absolutely handy USBSWITCHTO232 I2C and the absolute ease of use of I2C and USBS WITCHTO232 absolutely handy I2C and USBSWITCHTO232

STC12C5402型

通过51单片机产生不同频率的信号，在喇叭上产生不同频率的声音信号，实现不同音乐播放-Through 51 different single-chip frequency signal generated in the speaker s voice signals at different frequencies, different music player

C8051F120初始化SPI，启动CC2420。通过将CC2420 得VREG_EN 引脚置位高电平使能Voltage regulator，等待其稳定；然后重新启动CC2420 芯片，等待晶振起振。-Initialize SPI, start the CC2420. By CC2420 have VREG_EN pin high to enable the set Voltage regulator, waiting for their stability and then re-start the CC2420 chip, since waiting for crystal oscillator.

非常好的介绍MCS-51单片机以及汇编指令编程的文挡！可以打好扎实的基础。-Very good description as well as the MCS-51 microcontroller programming text block assembly instructions! You can lay a solid foundation.

射频卡资料，对射频卡分类、应用、开发工具等都有较为详细的介绍。-RF card, RF card classification, applications, development tools, and others have a more detailed introduction.

采用80C51单片机为控制核心，利用超声波传感器检测道路上的障碍，控制电动小汽车的自动避障，快慢速行驶，以及自动停车，并可以自动记录时间、里程和速度，自动寻迹和寻光功能。整个系统的电路结构简单，可靠性能高。 采用的技术主要有： 通过编程来控制小车的速度； 传感器的有效应用； 新型显示芯片的采用.-80C51 single-chip microcomputer used for the control of the core, the use of ultrasonic sensors detect obstacles on the road, control of electric cars automatic obstacle avoidance, fast low traffic speeds, as well as the automatic parking, and can automatically record time, mileage and speed, automatic track finding and searching optical function. Circuit the whole system of simple structure, high reliability. The technologies used are: programmed to control the speed of car the effective application of the sensor new display chip used.