Description: 低频射频卡水表源代码,使用ATMEL的T5557卡-low frequency RF Card meter source code, the use of the T5557 card ATMEL Platform: |
Size: 83030 |
Author:huanying |
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Description: 低频射频卡水表源代码,使用ATMEL的T5557卡-low frequency RF Card meter source code, the use of the T5557 card ATMEL Platform: |
Size: 82944 |
Author: |
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Description: 单片机C语言学习好资料
前言 2
基础知识：单片机编程基础 2
第一节：单数码管按键显示 4
第二节：双数码管可调秒表 6
第三节：十字路口交通灯 6
第四节：数码管驱动 7
第五节：键盘驱动 8
第六节：低频频率计 14
第七节：电子表 17
第八节：串行口应用 17
-Singlechip C language learning good basic knowledge of information Preface 2: Single-chip programming based on 2 Section I: Single-button digital tube display 4 Section II: dual digital tube 6 adjustable stopwatch III: traffic lights at a crossroads 6 4: digital tube drive 7 Section V: 8 of section VI of the keyboard driver: low-frequency frequency meter 14, Section VII: Electronic Table 17 in section VIII: Application of the serial port 17 Platform: |
Size: 53248 |
Author:华羿 |
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Description: 低频频率计
实例目的：学习定时器、计数器、中断应用
说明：选用24MHz的晶体，主频可达2MHz。用T1产生100us的时标，T0作信号脉冲计数器。假设晶体频率没有误差，而且稳定不变（实际上可达万分之一）；被测信号是周期性矩形波（正负脉冲宽度都不能小于0.5us），频率小于1MHz，大于1Hz。要求测量时标1S，测量精度为0.1％。-Examples of low-frequency frequency meter Objective: To study timer, counter, interrupt Application Note: optional 24MHz crystal, frequency up to 2MHz. 100us generated by the T1 time scale, T0 for the signal pulse counter. Assuming there is no crystal frequency error, and stable (in fact up to one ten thousandth) the measured signal is periodic rectangular wave (positive and negative pulse width can not be less than 0.5us), the frequency of less than 1MHz, greater than 1Hz. Requested measurement time scale 1S, measurement accuracy of 0.1. Platform: |
Size: 2048 |
Author:王伟 |
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Description: 本文用VHDL在CPLD器件上实现一种8 b数字频率计测频系统，能够用十进制数码显示被测信号的频率，不仅能够测量正弦波、方波和三角波等信号的频率，而且还能对其他多种物理量进行测量。具有体积小、可靠性高、功耗低的特点。-In this paper, VHDL in the CPLD device to achieve a 8 b digital frequency meter measuring frequency system that used the decimal digital display of measured signals in the frequency, not only to measure sine wave, square wave and triangular wave signals such as frequency, but also to other a variety of physical measurements. Small size, high reliability, low power consumption characteristics. Platform: |
Size: 224256 |
Author:xiaoju |
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Description: 一种等精度的频率计，同时适合高频和低频，误差小。-A precision frequency meter, etc. At the same time, suitable high-frequency and low frequency, the error small. Platform: |
Size: 1024 |
Author:邹国雄 |
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Description: 基于89C51单片机技术，介绍了一种数字式频率计数器，该频率计具有操作简单方便、响应速度快、体积小等一系列优点。可以及时准确地测量低频信号的频率。-Based on the 89C51 single-chip technology, introduces a digital frequency counter, the frequency meter is simple convenient, fast response, a series of advantages of small size. Can be timely and accurate measurement of the frequency of low-frequency signals. Platform: |
Size: 241664 |
Author:何蓓 |
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Description: 滴灌系统的程序，包括低频频率计和舵机控制-Drip irrigation system procedures, including the low-frequency frequency meter and steering control Platform: |
Size: 18432 |
Author:liyue |
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Description: 应用VHDL语言设计低频数字频率计，选择测频法方案，主要是控制电路，由其产生闸门、清零和锁存等信号。-VHDL, design low frequency digital frequency meter, select the frequency method to program, mainly the control circuit, produced by the gate and the latch so clear signal. Platform: |
Size: 439296 |
Author:付晓 |
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Description: 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 Platform: |
Size: 381952 |
Author:张谦 |
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Description: 低频频率计.频率小于1MHz，测量时标1S，测量精度为0.1 .用于C51单片机开发。-Low frequency meter. Frequency less than 1MHz, measurement standard 1S, measurement accuracy of 0.1 . For C51 MCU development. Platform: |
Size: 1024 |
Author:dfsa |
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Description: 做的等精度频率计，采用等精度测量原理，即利用双计数器“相关计数”和“硬件同步分频”实现高低频率的等精度的测量。用FPGA实现频率测量、周期测量、时间间隔测量、相位测量及脉冲宽度的测量。所有的测量功能都由VHDL语言编程实现。-I do other precision frequency meter, use and other precision measuring principle, namely the use of dual-counter " related counts" and " hardware synchronization frequency" to achieve such high and low frequency accuracy of the measurement. FPGA Implementation with frequency measurement, period measurement, time interval measurement, phase measurement and pulse width measurement. All the measurements by the VHDL language programming. Platform: |
Size: 51200 |
Author:yangqiuyue |
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Description: 自己写的，频率计，误差为小数点后一位（低频）-Wrote it myself, frequency meter, the error after the decimal point one (low frequency) Platform: |
Size: 1024 |
Author:张新 |
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Description: 本实验要完成的任务就是设计一个频率计，系统时钟选择核心板上的50MHz的时钟，闸门时间为1s（通过对系统时钟进行分频得到），在闸门为高电平期间，对输入的频率进行计数，当闸门变低的时候，记录当前的频率值，并将频率计数器清零，频率的显示每过2秒刷新一次。被测频率通过一个拨动开关来选择是使用系统中的数字时钟源模块的时钟信号还是从外部通过系统的输入输出模块的输入端输入一个数字信号进行频率测量。当拨动开关为高电平时，测量系统数字时钟信号模块的数字信号，否则测量从外部输入的数字信号。-To complete the task of the experiment is to design a frequency meter, the system clock select core board 50MHz clock, the gate time is 1s (system clock divider), at the gate during the high input frequency counted, recorded when the gate goes low when the current value of the frequency and the frequency counter is cleared, the frequency display every two seconds to refresh. Measured frequency via a toggle switch to select the digital clock source module using the system clock signal from an external digital signal input through the input end of the system' s input and output modules for frequency measurement. When the toggle switch is high, the module of the digital signal of the digital clock signal of the measurement system, otherwise the measurements input from the outside, the digital signal. Platform: |
Size: 1021952 |
Author:真三战魂 |
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Description: 基于MSP430制作的频率计 输入一个低频信号可以测出频率-Based on MSP430 produced a low-frequency signal input frequency meter can measure the frequency Platform: |
Size: 25600 |
Author:TM |
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Description: 此程序使用STM32实现了频率计的功能，当频率比较低时，测量结果十分准确。高频时，略有误差，但是不能侧得的频率过高。-This program uses the STM32 implements frequency meter function, when the frequency is relatively low, the measuring results are very accurate. High frequencies, a slight error, but not too excessive frequency side. Platform: |
Size: 5737472 |
Author:杨有国 |
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Description: 本系统基于C8051F020实现等精度的频率测量，利用该单片机灵活的控制功能及速
度优势，大大提高了性能和测量精度。以往的测频都是采用高频段直接计数、低频段间接测周
的方法，其测量精度往往会随着被测频率的改变而受到影响。为了克服测频中高低频段测量精
度不等的缺陷，采用双计数器设计，实现等精度的频率测量。等精度的测量方法不但具有较高
的测量精度，而且在整个测频区域内保持恒定的测量精度。-The system is based on C8051F020 achieve equal precision frequency measurement, the use of the flexible single-chip control functions and speed advantage, greatly improving the performance and measurement accuracy. Previous measurements are made of high-frequency band direct counting method week low frequency indirect measurement, the measurement accuracy is often measured as the change in the frequency of the affected. To overcome the high and low band frequency measurement accuracy ranging from defects, dual counter design, implementation, and other precision frequency measurements. Such as the accuracy of the measurement method not only has high accuracy, and maintain a constant accuracy over the entire measuring frequency region. Platform: |
Size: 86016 |
Author:汪志 |
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Description: 数字频率计作为一种常见的应用电子仪器设备，传统的一般可以完全由硬件电路搭接而成，如采用基于555 定时器电路的多功能数字频率计的设计便是可取的路径之一，不用依靠单片机。但是这种电路存在一些缺点，且测频精度也不如单片机的高。在科学研究和生产实践中，如工业过程控制，生物医学，地震模拟机械振动等领域常常要用到频率计。利用单片机采用程序设计方法来设计频率计，其测频精度高。且线路相对简单，结构紧凑，价格低廉，系统稳定度高，抗干扰能力强，用途广泛等优点-Digital frequency meter is a common application of electronic devices, the traditional general can completely by hardware circuit lap, such as the use of 555 timer circuit based multifunctional digital frequency meter design is the one of the desirable paths without by MCU. But this circuit has some shortcomings, and the accuracy of frequency measurement as well as the MCU high. In the scientific research and production practice, such as industrial process control, biomedicine, seismic modelingmechanical vibration and other fields often use frequency meter. The use of single-chip microcomputer to design frequency meter program design method is adopted, the frequency measurement precision. And the lines are relatively simple, compact structure, low cost, high stability, strong anti-interference ability, wide range of uses, etc. Platform: |
Size: 3618816 |
Author:袁丁 |
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Search - Low Frequency meter