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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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dashboard1.3L
汽车仪表程序 驱动步进电机，LCD段码式 燃油表，水温表，车速表，转速表(dashboard program)
- 2016-03-09 14:39:34下载
- 积分：1
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spi
SPI通信---pic18系列单片机编程实现使用MAX7219控制4位7段数码管显示数字：0 1 2 3。(SPI communication--- pic18 series microcontroller programming using the MAX7219 control four 7-segment LED display digits: 0123.)
- 2014-01-20 15:53:58下载
- 积分：1
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UltrasonicTesting
这是一本超声波2级考证的一本书，也是超声波专业学习者和研究者的基础书籍，很实用的。(This is a book about the ultrasonic level 2, and it is also the basis of learners of ultrasonic professional and researchers books, very practical.)
- 2014-10-31 15:36:52下载
- 积分：1
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PE4302
PE4302正点原子minif103的驱动代码，串行模式，使用请将P/S口接到高电平（最好直接接到单片机3.3V输出口）(Driver code of minif103 of PE4302 punctual atom, serial mode, please connect P/S port to high level (preferably directly to MCU 3.3V output port))
- 2020-06-23 01:40:02下载
- 积分：1
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单片机C语言程序设计实训100例
单片机C语言程序以及全程学习用资料，可以参考，相关程序。(MCU learning procedures, are some examples of procedures, may be used for reference,)
- 2017-07-26 12:06:17下载
- 积分：1
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Freescale-Chapter-8
Freescale系列单片机常用模块与综合系统设计实例精讲-第八章(Freescale microcontroller series common modules and integrated system design example succinctly- Chapter VIII)
- 2014-04-04 20:16:57下载
- 积分：1
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L6
说明： 异步电动机又称感应电动机，是由气隙旋转磁场与转子绕组感应电流相互作用产生电磁转矩，从而实现机电能量转换为机械能量的一种交流电机。(Asynchronous motors, also known as induction motor, rotating magnetic field by an air gap and the rotor winding induced current interaction of electromagnetic torque, electromechanical energy conversion in order to achieve an alternating electrical to mechanical energy.)
- 2016-04-24 20:18:28下载
- 积分：1
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shengchanliushuixian
利用可编程计数/定时器8253设计一个应用于生产流水线的自动计数系统。通过具体阐述8253的工作原理，系统的软、硬件设计原理以实现系统所需定时、计数、中断等功能，并驱动扬声器发出所需频率的声音。(Using the programmable counts/timer 8253 design a applied to production line of automatic counting systems. Through the concrete 8253 working principle, hardware and software of the system design principle to achieve system, such as timing, counting, and drive a loudspeaker functions required sounds.)
- 2010-06-10 15:52:40下载
- 积分：1
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luojinmenyu
这是一个楼禁门宇系统的程序，经过调试仿真，结果良好，但是有待改进(This is a building ban door-yu system procedures, after debugging emulator with good results, but could be improved)
- 2013-09-24 20:10:23下载
- 积分：1
