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[SCM] 20110409

Description: 本系统采用C51系列的89S52单片机为核心，通过设置89S52单片机的定时器产生脉宽可调的PWM波【2】，对阀门电机的输入电压进行调制，实现阀门开度的变化，进而实现了对液体流量的控制。单片机通过电磁流量计采集实际流量信号，根据该信号对其内部采用数字PID算法对PWM变量的值进行修改，从而达到对流量的闭环精确控制。-The system uses microcontroller 89S52 C51 series core, 89S52 microcontroller by setting the timer to generate pulse width adjustable PWM wave 【2】, input voltage of the valve to modulate the motor to achieve changes in valve opening, thus achieving The control of liquid flow. SCM actual flow through the electromagnetic flow meter signal acquisition, according to the signals of its internal PWM digital PID algorithm to modify the value of the variable to achieve precise control of the flow loop.
Platform: | Size: 204800 | Author: 林鸿 | Hits:

[SCM] pinlvji

Description: 基于89C51单片机的简易数字频率计的设计，系统以单片机为主控单元，主要用于对方波频率的测量。-89C51-based microcontroller design simple digital frequency meter, main control unit MCU system is mainly used for measuring the frequency of each wave.
Platform: | Size: 254976 | Author: 冯紫藤 | Hits:

[VHDL-FPGA-Verilog] fenpin

Description: 利用单片机的计数器来制作简易分频计，因为P1^0用来模拟外界波形输入，它提供周期为100ms的方波。与T1管脚相连后，T1可对其进行周期计数。 程序中的变量TL1决定着分频系数，其值乘以2即为分频系数。 改变其值可以得到相应的分频输出波形（方波）。 P1^1为输出管脚，将其连接示波器可以看到分频后的波形。-To make use of simple single-chip counter frequency meter, because P1 ^ 0 input waveforms used to simulate the outside world, it provides a period of 100ms square wave. After the pin is connected to T1, T1 can be cycle counted. TL1 variables in the program determines the frequency factor is multiplied by 2 is the frequency factor. Change its value can be divided by the corresponding output waveform (square wave). P1 ^ 1 for the output pin, connect the oscilloscope to see the waveform divided.
Platform: | Size: 1024 | Author: 耙斗星 | Hits:

[VHDL-FPGA-Verilog] Frequency-counter

Description: 基于FPGA的数字频率计：1. 测量1Hz～1GHz方波的频率，精度为十分位。 2. 档位自动调整，分为1Hz~999.9Hz,1KHz~999.9KHz,1MHz~999.9MHz三个档位。 3. 实现16位的除法器，进行频率的计算，并以ASIIC码输出测量的数据。 -FPGA-based digital frequency meter: 1. Measurement 1Hz ~ 1GHz square wave frequency, accuracy decile. (2) automatically adjusts the stalls, divided into 1Hz ~ 999.9Hz, 1KHz ~ 999.9KHz, 1MHz ~ 999.9MHz three stalls. 3 for 16-bit divider, the frequency calculations, and ASIIC code output measured data.
Platform: | Size: 133120 | Author: 曾 | Hits:

[SCM] 51

Description: 设计并制作一台出租车计价器。调试时采用10Hz方波信号模拟，每个方波代表10m-Design and making a smart meter taxi. The 10 Hz debugging square wave simulation signal, each square wave represents 10 m
Platform: | Size: 142336 | Author: yangmeng | Hits:

[VHDL-FPGA-Verilog] shuzipinlvji

Description: 8位十六进制频率计设计 根据频率的定义和频率测量的基本原理可以测量方波、三角波、正弦波；测量范围10Hz～10MHz，测量分辨率1Hz，测量误差1 Hz-8 hexadecimal Frequency Meter 1 Hz square wave, triangle wave, sine wave can be measured measuring range 10Hz to 10MHz, measurement resolution 1Hz, measurement error according to the basic principles of definition and frequency of the frequency measurement
Platform: | Size: 425984 | Author: 罗先生 | Hits:

[VHDL-FPGA-Verilog] example-of-MCU

Description: 单片机的c语言教程：定时报警器，交通灯，密码锁，出租车计价器，频率可调的方波信号发生器，简易数字直流电压表。-Microcontroller c language tutorial: Timing alarm, traffic lights, locks, taxi meter, adjustable frequency square-wave generator, a simple digital DC voltmeter.
Platform: | Size: 470016 | Author: 孙策 | Hits:

[SCM] pro519

Description: 用89C51实现频率计（1hz—500khz），可以产生3M以下的方波，-With 89C51 frequency meter (1hz-500khz), can produce a square wave below 3M
Platform: | Size: 1024 | Author: jjj | Hits:

[SCM] freq_cap

Description: 基于msp430f149单片机制作的简易频率计，能够准确测量1hz到12khz的正弦与方波等的频率，测量误差小于1 ；-Based on msp430f149 microcontroller simple frequency meter can accurately measure the 1hz to 12khz sine and square wave frequency, the measurement error is less than 1
Platform: | Size: 39936 | Author: yanrui | Hits:

[SCM] Chip-development-project

Description: 单片机开发工程师案例分析与解析 1.定时报警器 2.交通灯 3.密码锁 4.出租车计价器 5.频率可调的方波信号发生器 6.简易数字直流电压表 7.简易频率计-Microcontroller development engineer case analysis and parsing. Timing alarm 2. Traffic lights. Combination lock. Taximeter 5. Frequency tunable square wave signal generator 6 simple digital DC voltmeter. Easy frequency meter
Platform: | Size: 729088 | Author: bin | Hits:

[VHDL-FPGA-Verilog] shuzipinlvji

Description: 设计一个能测量方波信号的频率的频率计，测量的频率范围是0 999999Hz，结果用十进制数显示。 -Design a frequency meter measuring the frequency of the square wave signal, the measurement frequency range is 0 ~ In 999999Hz The results are shown in decimal.
Platform: | Size: 110592 | Author: miqiuso | Hits:

[SCM] pinlv

Description: 此为简易的频率计，可测10hz到1Mhz的频率，通过整形电路测方波，三角波，正弦波，还具有自校功能，也可测周期，这个为自己做的仪器原理的课程设计，里面包含程序及设计报告。可方便大家的使用。测量误差《0.1 -This is a simple frequency meter, capable of measuring 10Hz to 1Mhz frequency, by shaping circuit measuring square wave, triangle wave, sine wave, also has the self checking function, also can be used to cycle, the principle of the instrument to do their own curriculum design, which contains the code and design report. To facilitate the use of. The measurement error "0.1
Platform: | Size: 2048 | Author: dong | Hits:

[Software Engineering] dddd

Description: 这是基于单片机自动量程的频率计的PPT，里面包含了方案的总体硬件框图，以及5V稳压电源电路的设计，以及以高频为10kHz、低频为800Hz的正弦波频率和方波频率两种频率信号进行比较-This is a microcontroller based automatic frequency range meter PPT, which contains a hardware block diagram of the overall program, as well as 5V power supply circuit design, as well as the high frequency of 10kHz, low-frequency sine wave frequency is 800Hz square wave frequency and two comparing the frequency of the signal
Platform: | Size: 603136 | Author: dang | Hits:

[Other Embeded program] xiangweiyi

Description: 本设计给出了以凌阳16位单片机Spce061A为核心的数字式相位测量的基本原理与实现方案。该系统由相位测量仪、数字式移相信号发生器和移相网络三个模块构成，分别由两块单片机独立地实现控制与显示功能。采用DDS技术生成两路正弦波信号，并通过改变存储器中数据读取的起始地址来实现数字移相的功能，用Ф-T变换技术来实现相位差的测量，使得测量分辨率精确到0.1o，测得的频率与相位差值送入LCD进行显示，加入红外键盘以及语音播报的功能，使得系统具有智能化、人性化的特色。-This design gives the basic principles and implementation of programs to Spce061A Sunplus 16-bit microcontroller as the core of digital phase measurement. The system consists of a phase meter, digital phase shifting generator and phase-shifting network of three modules, independently by two microcontroller for control and display functions, respectively. DDS technology used to generate two sine wave signals, and by changing the start address of the memory read data to realize the function of the digital phase shift, with Ф-T conversion technology to achieve a phase difference measurement, making accurate measurement resolution 0.1 the frequency and phase of the measured values ​ ​ into the LCD display, adding infrared keyboard and voice broadcast feature that makes the system with intelligent, user-friendly features.
Platform: | Size: 433152 | Author: 何祥 | Hits:

[Other] DB_GP22_cn

Description: TDC-GP22 为TDC-GP21的下一代升级产品.这颗芯片是与TDC-GP21芯片100 管脚和功能兼容的芯片,而且带有更 强大的功能. 尤其这颗芯片的最新第一波检测功能,将使TDC-GP22非常适合于高动态范围的超声波水表的应 用.可编程的比较器offset调整范围增加到了 ± 35 mV ,而且这个比较器offset将会在第一波检测后自动回 到0点比较.测量第一个回波脉冲的相对宽度将会给用户一个对于接收信号强度的提示.通过这个提示信息可以 用于系统的长期覆盖物的信号减弱判断,以及用于气泡检测.多个测量脉冲的数据处理和数据读出功能将会比 TDC-GP21更加简单方便.-The next generation TDC-GP22 TDC-GP21 upgrade products. This chip is pin and function compatible chip and the TDC-GP21 chip 100 tube, and with more Powerful functions. This chip detection function especially the latest first, will make the TDC-GP22 ultrasonic water meter is very suitable for high dynamic range should be . comparator offset programmable adjustment range increased to 35 mV, and the comparator offset will automatically back in the first wave detection To 0 points of comparison. Measure the first echo pulse relative width will give the user a for received signal strength by the prompt information can prompt. A signal for long term covering system weakened judgment, as well as for bubble detection. A plurality of pulse measurement data processing and data read function will be greater than TDC-GP21 is more simple and convenient.
Platform: | Size: 5882880 | Author: 刘欢 | Hits:

[Software Engineering] 8

Description: Ultrasonic Level Meter Intelligent Radar Level Meter Guided Wave Radar Level Meter
Platform: | Size: 1595392 | Author: mohamad | Hits:

[VHDL-FPGA-Verilog] plj.FPGA

Description: 本频率计基于CPLD/FPGA实现。　50MHZ标准频率为CPLD内部时钟信号，被测方波为信号发生器产生的方波信号，显示电路由TTL芯片及七段数码管组成的电路，自校正输出由CPLD输出已知频率的测试方波信号，可将其输入至测试端口，进行系统精度校正。　-The frequency meter based on CPLD/FPGA implementation. 50MHZ standard CPLD internal clock signal frequency, square-wave test signal is a square wave signal generator, the display circuit circuit TTL chip and composed of seven segments, self-correction output the CPLD output a known frequency square wave test signals can be input to the test port for system accuracy correction.
Platform: | Size: 9276416 | Author: 刘波 | Hits:

[SCM] pinlvji

Description: 本文设计了一个基于STC89C51单片机的数字频率计。该频率计包括单片机模块、放大整形模块、分频模块及显示四个模块。输入正弦和矩形信号经高频晶体管放大后，利用74HC14可得到高频高精度方波信号；利用74HC390可进行高精度分频以达到高频信号测量，并利用单片机在1s闸门时间内对输入信号进行计时、计数以获取频率值，通过LCD1602液晶显示器将频率显示出来。经试验验证，正弦信号频率可达10Hz-32MHz，电压有效值最低65mV-1V，相对误差0.01 ；矩形波频率可达150Hz-2.2MHz，峰峰值电压66mV-1V，测量数据刷新时间0.1s。本设计结构简单、价格成本低、操作方便，适用于日常生活、科研生产等领域。-This paper designed a microcontroller based STC89C51 digital frequency meter. The frequency meter includes a single-chip module, amplification shaping module, frequency module and display four modules. Input sine and rectangular signal after amplification of high-frequency transistors, high-frequency precision use 74HC14 available square wave signal the use 74HC390 accuracy can be divided in order to achieve a high-frequency signal measurement, and the use of SCM in 1s gate time of the input signal for a time, in order to obtain a frequency count value through LCD1602 LCD display the frequency display. The test verified the sinusoidal signal frequency up to 10Hz-32MHz, the minimum rms voltage 65mV-1V, the relative error of 0.01 rectangular wave frequencies up to 150Hz-2.2MHz, peak to peak voltage of 66mV-1V, measurement data refresh time 0.1s. The design of the structure is simple, low cost price, easy to operate, suitable for areas of daily life, scientific research and production.
Platform: | Size: 81920 | Author: dina | Hits:

[CSharp] zpqm

Description: 频率计，基本设计原理是直接用十进制数字显示被测信号频率的一种测量装置。它以测量周期的方法对正弦波、方波、三角波的频率进行自动的测量。-Frequency meter, the basic design principle is directly with decimal digital display measured signal frequency of a measuring device.It with the method of measuring cycle of sine wave, square wave, triangle wave frequency for automatic measurement.
Platform: | Size: 160768 | Author: 陈松 | Hits:

[Other Embeded program] shuzipinlvji

Description: 本数字频率计将采用定时、计数的方法测量频率，采用一个1602A LCD显示器动态显示6位数。测量范围从1Hz—10kHz的正弦波、方波、三角波，时基宽度为1us,10us,100us,1ms。用单片机实现自动测量功能。-The digital frequency meter will adopt the method of timing, counting measuring frequency, USES a model 1602 a dynamic LCD display 6 digits. Measuring range 1 hz- 10 KHZ sine wave, square wave, triangle wave, time base width is 1 us, us 10, 100 us, 1 ms. Single-chip microcomputer is used to implement automatic measurement function.
Platform: | Size: 178176 | Author: 小唯 | Hits:
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