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1602
说明： 用4*4矩阵键盘给液晶1602送四位数，其中第四行按键设置为功能键，按键显示可调对应位的数字(With 4* 4 matrix keyboard to send the four-digit LCD 1602, the fourth line of buttons is set to function keys, adjustable button displays the corresponding number of bits)
- 2009-08-29 13:21:16下载
- 积分：1
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LED1728
合泰单片机pb口输出1秒钟变换一次高低电平，用于测试定时器和端口输出指令。(holtek mcu,1 secend change I/0 _pb,high or low)
- 2018-03-15 10:08:41下载
- 积分：1
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BATmonitor_1.7
利用LTC6802结合stm32检测24芯锂电池电压以及电池温度，还可以实现放电平衡(Test 24 core voltage and temperature)
- 2020-06-17 23:40:02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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ADXL345-Manual-Chinese
ADXL345 加速度计 用户手册 中文资料(ADXL345 accelerometer User Manual Chinese data)
- 2013-11-05 22:52:14下载
- 积分：1
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cordic
基于cordic算法的DDS的Verilog代码。经过仿真验证，绝对可靠。(Based on cordic algorithm DDS Verilog code. Through the simulation, is absolutely reliable.)
- 2013-12-20 17:22:38下载
- 积分：1
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usart1usart2
串口1串口2互相转发对方收到的数据，串口2转发串口1收到的数据，串口1转发串口2收到的数据，stm32(Serial port 1 serial port 2 forward each other to receive the data, the serial port 2 serial port 1 received data, serial 1 forwarding serial port 2 received data, stm32)
- 2020-11-06 07:59:50下载
- 积分：1
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SPWM-STM32-master
stm32单片机实现对逆变电源的输出波形控制，包含proteus仿真.(stm MCU realizes the output waveform control of inverter power supply, including proteus simulation.)
- 2018-01-16 12:43:57下载
- 积分：1
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SiRF_Binary
SiRF Binary Protocol Reference Manual
Rev2.3-Dec07
- 2010-07-31 23:32:29下载
- 积分：1
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John.Wiley.and.Sons.You.Can.Do.It.A.Beginners
[2005最新C++经典著作].John.Wiley.and.Sons.You.Can.Do.It.A.Beginners.Introduction.to.Computer.Programming.eBook-DDU([2005 C latest classics]. John.Wiley.and.Sons.Yo u.Can.Do.It.A.Beginners.Introduction.to. Computer.Programming.eBook- DDU)
- 2007-01-08 10:06:54下载
- 积分：1
