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zhiliudianliuyuan
本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。(the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D/A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current/voltage changes, the A/D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the )
- 2006-06-27 08:41:38下载
- 积分：1
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ZLG500A13manual
Zlg500读卡器使用手册(Zlg500 reader's guide.)
- 2007-05-08 16:39:53下载
- 积分：1
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STM8反汇编
说明： 改进了以前的反汇编的错误，增加了地址标签输出(Improved the previous disassembly errors and increased the address tag output)
- 2021-04-15 09:08:54下载
- 积分：1
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isight_code
isight与adams、MATLAB、adaqus等集成源程序(isight and adams, MATLAB, abaqus and other integrated source)
- 2016-07-10 11:00:59下载
- 积分：1
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pdfp
PRINT PDF AT Adobe Reader 8
- 2015-10-31 15:21:11下载
- 积分：1
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baseon80c51ofmc522
读写器与射频卡通信的设计采用RC522射频读写芯片与射频卡进行通信，符合ISO14443规范协议；硬件系统设计中主要有AVR单片机主控模块、电源模块、存储模块、外部时钟模块、LCD模块；软件系统设计采用C语言，遵循模块化和结构化编程模式，设计了射频卡操作程序、软关机与自动关机程序、LCD显示、串行Flash存储器、外部时钟等外部设备驱动程序。所设计的手持式读写器具备对MF1 S50、S70射频卡的读写、实时状态显示、系统在线升级以及关机等功能。(This handset can process the data offline or online, reading and writing from 10 cm far. This handset is low-power, miniature, modular design and so on. This article includes: the communication design between RF card and Reader, hardware system design and software systems design. The communication design between RF card and Reader used to RC522 RF chip control RF cards, in line with ISO14443 standard protocol Hardware system design mainly include AVR microcontroller control modules, power modules, memory modules, external clock modules, LCD modules Software system designed with C programming language, and follow the modular structure of the programming model, and has the RF card operation procedures, soft shutdown and automatic shutdown procedures, LCD display, serial Flash memory, an external clock, and other external device driver Procedures. The handset readers has the MF1 S50, S70 RF card reader function, real-time status display function, the system online update function and so)
- 2021-03-22 20:19:16下载
- 积分：1
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STM8S105K6T6C
STM8S105+CS5464 功率计算(STM8S105+ CS5464 power calculation)
- 2020-11-17 22:09:39下载
- 积分：1
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chaoshengbo
郭天祥tx-1c单片机驱动超声波完整程序
超声波为hc-sr04(Debates tx-1c MCU-driven ultrasonic ultrasonic complete program for the hc-sr04)
- 2013-07-23 12:09:53下载
- 积分：1
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bj
说明： 51单片机实现对步进电机的控制，改变程序中的数值可改变转速和角度(51 single-chip stepper motor control, change the value of the program can change the speed and angle)
- 2013-06-07 20:53:28下载
- 积分：1
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kejian4
单片机开发与概述（7---9）希望大家喜欢(Single-chip development and overview (7--- 9) hope you like)
- 2007-12-17 09:41:33下载
- 积分：1
