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串口+51+lcd
pc通过串口助手发送字符串给下位机单片机，lcd1602显示
- 2022-04-19 03:03:16下载
- 积分：1
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51单片机Ds18B20代码
适用于基于51单片机的ds18b20温度传感器测量温度，含有数码管显示温度，LCD1602显示温度，以及LCD1602接受温度的代码，还有word版实验必读。
- 2022-03-03 08:25:16下载
- 积分：1
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PWM
Keil STC单片机 2路互补输出SPWM-C语言
- 2023-02-07 06:35:03下载
- 积分：1
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shuanglushuzihecheng
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)
- 2021-04-08 20:19:00下载
- 积分：1
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Cdeepon
C语言深度剖析。请认真阅读自己分析。自己实际连一下。(C deepon。)
- 2014-07-31 12:31:35下载
- 积分：1
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驱动
J-Link V8刷新固件包,注意：修改序列号；解决问题主要是：clone(J-Link V8 refresh firmware package and source file(*.bin).notice :change the SN seril)
- 2017-11-02 11:05:33下载
- 积分：1
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diary
可运行的日记文件，可以记录内容并按时间分类，根据你的输入打开，删改日记文件等(a diary which can be executed so that you can record your diary and date.It can be )
- 2013-07-29 02:41:42下载
- 积分：1
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13菜单的竖向分列
13菜单的竖向分列(Vertical split of 13 menus)
- 2017-10-23 19:23:00下载
- 积分：1
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MATLAB-optimation
matlab优化方法 不精确的一维线性搜索(matlab optimization method inaccurate one-dimensional linear search)
- 2012-10-24 18:38:20下载
- 积分：1
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CC2530NDK
CC2530NDK实验1——Z-STACK SensorDemo实验(CC2530NDK Experiment 1- Z-STACK SensorDemo experiment)
- 2014-01-19 20:35:37下载
- 积分：1
