51单片机_BH1750_DS18B20光照温度采集

说明：  单片机做的万年历公历农历转换代码，用的C语言(SCM calendar Lunar calendar to do the conversion code, using the C language)

ICCAVR 编写的mega16矩阵键盘测试程序(ICCAVRmega16 matrix keyboard driver)

stc89c52单片机驱动蜂鸣器的程序，延时函数用定时器方式编写。(stc89c52 MCU-driven buzzer procedures, with the timer delay function approach to the preparation.)

STM32的USB上位机，动态库，STM32端原代码以及驱动程序(STM32USB，drive code)

传输线等值电路计算实例，已调试成功，输出波形正确。(Transmission line equivalent circuit calculation example, has been successful commissioning, the output waveform is correct.)

3000TB51配套实验例程 1八段数码管显示实验 等(Experimental routine 3000TB51 matching one eight digital tube display experiments)

摘要 电能表作为用电量的测量工具广泛的应用于各种场合。在电能表校表系统中,需要的最基本的输入信号源是高精度双路正弦信号源,并要求可对其频率、相位、幅值进行调节,来对电能表进行校准。 基于单片机的程控信号源设计，运用数字调相、数字调幅和数字调频等技术，要求实现相位、幅度、频率的高精度程控调节。本文设计了一种利用锁相环频率合成技术和数字波形合成技术组成的程控低频正弦波信号发生器，并给出了调幅、调频、调相的实用电路，频率调节通过改变8253计数器的分频系数来实现；相位调节由51单片机预置计数器的计数初值来完成，幅度的调整通过改变DAC1210II的参考电压来实现，使频率分辨率达0.01Hz,相位调节精度达0.1°，并介绍电路中的主要芯的功能及使用。输出正弦波频率和幅值的精度高，稳定性好，失真度低，电路简单、可靠、便于程控。 关键词：数字合成信号源；程控；调幅；调频；移相； (Abstract Meter consumption as the size of the measurement tool is widely used in various occasions. In single-phase power meter verify system, the most basic needs of the input signal is the source of two-way high-precision sine signal source, and may request its frequency, phase, amplitude in a certain step to adjust to the imitate of the actual electricity load with a right meter calibration. Design of the programmable signal supply controlled source，which based on the MCU，including digital phase adjustment，distal amplitude adjustment，digital frequency adjustment etc．The system should achieve high quality digital adjustment of phase, amplitude and frequency. This paper describes the use of a PLL frequency synthesizer technology, and digital wave form synthesis technology consisting of program-controlled low-frequency sine wave signal issued devices, and applies the amplitude， frequency， phase of practical circuit. Frequency can be adjusted through a change in the 8253 counter-frequ)

T5557卡的读写程序，KEIL4平台，曼彻斯特解码(T5557 card reader procedures, KEIL4 platform, Manchester decoding)

说明：  51单片机学习资料 非常好 非超好 51单片机学习资料(1 single-chip learning materials very good non-super good 51 single-chip learning materials)

Delta servo drive a new generation of hardware ASDA-B2 manual programming is an electrical engineer hardware reference manual,