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Amazing-Key-Pad
here is a document describing KEy pad decoding techniques and C++ source code as well. it is show 74ls138 role in decoding..
hope it will be helpful.
THANKS
- 2014-07-17 19:13:43下载
- 积分：1
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HookShadowSSDT
hook ssdtShadow影子描述表，采用普通的ssdthook；(hook system description table, ssdt table)
- 2012-11-23 21:54:31下载
- 积分：1
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STM32SPWM-190426
用TIM1输出6路互补的SPWM，实现电机转动，用VF调频调压(Six complementary SPWM outputs from TIM1 are used to realize motor rotation and VF frequency and voltage regulation.)
- 2019-06-29 15:34:06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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1602
说明： 1602的显示程序，很简单的那种，可以当入门之用(1602 1602 1602 1602 1602 1602)
- 2010-04-24 16:19:21下载
- 积分：1
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GEADVANCE3D_Sinogram
数据转换为正弦图，最终输出的正弦图为平均正弦图。(Data into sine figure, final output sine the graph is the average sinogram.)
- 2013-10-07 15:26:07下载
- 积分：1
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red-decode
红外解码数码管显示,用你一个外部中断和一个定时器中断来做的，虽然可以解码，但是效率不高，不建议在商用产品上使用。(IR decoding the digital tube display, you use an external interrupt and a timer interrupt to do, although it can be decoded, but efficiency is not high, not recommended for use in commercial products.)
- 2014-03-08 13:54:11下载
- 积分：1
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diankao
基于51单片机的proteus仿真系统，其中包括AD转换模块的应用(51 single-chip microcomputer-based simulation system of proteus, including the application of AD converter module)
- 2009-05-15 16:36:40下载
- 积分：1
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AN2548_STM32F10xxx DMA 控制器应用实例
说明： 这篇文档描述了怎样使用STM32F101xx和STM32F103xx的直接对内存访问(DMA)控制器(This document describes how to use STM32F101xx and STM32F103xx direct memory access (DMA) controllers)
- 2020-12-05 12:35:11下载
- 积分：1
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shumaguan
51单片机简单小程序，用keil软件编写，实现数码管的循环移动(51 single simple small program, keil software development, mobile digital tube to achieve the cycle)
- 2014-05-07 15:45:41下载
- 积分：1
