为提高温度测量效率，降低系统的成本，扩展传输距离，设计出一种新型温度采集系统。单片机通过控制具有单总线方式的温度传感器DS18B20实现对温度的测量，同时单片机通过控制具有单总线方式300～450MHz频率范围内的MAX7044与MAX7033无线发射与接收芯片实现温度数据的无线传输。与传统温度采集系统相比，该系统利用单总线方式连接，采用无线传输方式实现远距离通信，易于系统的集成与扩展。实验结果表明，该系统结构简单、方便移植，能够同时实现多达上百点温度的测量与500m范围的传输。 Abstract: To improve the temperature measurement efficiency and reduce system cost,expansion of transmission distance,a new type of temperature acquisition system is designed.Microcontroller controlled temperature sensor DS18B20which has a single-bus achieves temperature measurement,while microcontroller by controlled the MAX7044and MAX7033chip with a single-bus and having300~450MHz radiofrequency to achieve the wireless transmission of temperature data.Compared with conventional temperature acquisition system,the system uses single-bus connected,and uses wireless transmission means to achieve long-distance communications,easy-to-system integration and expansion.The experimental results show that the system is simple,convenient transplantation,and can be implemented in as many as a hundred-point temperature measure-ment and the transmission range of500meters.
上传时间： 2013-10-29
上传用户：515414293
摘要：介绍了基于IIS总线嵌入式音频设备硬件体系结构及其Linux驱动设计在音频驱动设计综合使用了DMA、分段多缓存区和内存映射技术以提高系统性能满足音频实时性要求。 关键词：音频设备驱动 IIS总线 嵌入式Linux DMA 内存映射
上传时间： 2013-10-13
上传用户：Aeray
介绍一种简单射频识别系统设计。该设计包括阅读器、应答器和线圈3部分。由单片机控制阅读器向应答器发射无线信号，并接收应答器回送的信号，再通过分析回送信号识别物品。阅读器和应答器之间以半双工通信方式通信。 Abstract: A simple design of radio frequency identification system is given in this paper.The design includes reader,responder and winding.Through MCU，signals are sent to responder from reader，then corresponding signals are sent back. According to the analysis of the signals sent back，the objects can be identified.Half-duplex communication is adopted? between? reader? and? responder.
上传时间： 2013-10-11
上传用户：plsee
MMC/SD卡以其优越的性能，在单片机嵌入式设备中得到广泛应用。将MMC/SD卡作为外部掉电存储介质应用于音频信号发生器中，通过8051F330单片机上的SPI接口，实现单片机—MMC/SD卡的存储扩展，设计了此硬件平台上的MMC/SD卡的单片机驱动程序，并给出了相应的程序代码，满足音频信号发生器的大容量存储要求。 Abstract: MMC/SD card is more and more widely used in the single chip embedded devices for their excellent performances.This article introduces the application of MMC/SD card as the external power down storage medium in audio signal generator. The extension technology especially for storage of single chip-MMC/SD card via SPI interfaces in 8051F330 single chip, including designs single chip drive program of MMC/SD card based on hardware platform,and also gives the key coding of the program. The implementation of big capacity storage is meaningful in audio signal generator.
上传时间： 2014-12-27
上传用户：黄华强
基于幅移键控技术ASK（Amplitude-Shift Keying），以C8051F340单片机作为监测终端控制器，C8051F330D单片机作为探测节点控制器，采用半双工的通信方式，通过监控终端和探测节点的无线收发电路，实现数据的双向无线传输。收发电路采用直径为0.8 mm的漆包线自行绕制成圆形空心线圈天线，天线直径为（3.4±0.3）cm。试验表明，探测节点与监测终端的通信距离为24 cm，通过桥接方式，节点收发功率为102 mW时，节点间的通信距离可达20 cm。与传统无线收发模块相比，该无线收发电路在受体积、功耗、成本限制的场合有广阔的应用前景。 Abstract: Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller， using half-duplex communication mode， this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter （3.4±0.3） cm circular hollow coil antenna. Tests show that the communication distance between detection and monitoring of the terminal is 24cm，the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules， the circuit has wide application prospect in small size， low cost and low power consumption and other characteristics.
上传时间： 2013-10-19
上传用户：xz85592677
为了提高环境参数采集的自动化水平，提升效率，设计了无线传感器系统。本系统运用了传感器技术、通信技术和单片机技术，实现了对环境温度、湿度、光照度以及可燃性气体浓度等参数的检测。它能够实时地与上位机进行无线通信，满足对环境参数实时监测的要求。 Abstract: In order to increase the degree of automation and improve the efficiency of the environment monitoring parameters，the wireless sensor system was developed.Combining with the technique of sensor,automatic monitoring，communication and single-chip microcomputer，it realized real-time monitoring environment parameters,such as temperature，humidity，illumination，concentration of com- bustible gas and so on.At the same time it can communicate with upper personal computers，satisfy the desire of real-time monitoring.
上传时间： 2013-11-22
上传用户：longlong12345678
摘要：利用STC89C55RD+的在应用可编程功能和射频芯片nRF401，设计了一个无线数据通信方式下的LED点阵显示系统。该系统采用了上一下位机的结构构建，利用无线收发模块实现显示信息及控制命令的发送，并且充分利用了该单片机大容量的数据Flash区，通过在应用可编程功能实现多条信息的实时发布、擦除和修改。关键词：单片机，在应用可编程，无线，点阵
上传时间： 2013-11-03
上传用户：zjwangyichao
摘要：本文详细探讨了单片机在工业无线网络中的具体应用。关键词：单片机（MCU）；工业无线网络；ZIGBEE；SOC
上传时间： 2013-12-24
上传用户：qijian11056
介绍了一种基于8051内核的无线射频传输芯片nRF9E5，采用该芯片制作了扑翼微型飞行器的遥控系统，对遥控系统的收发装置进行了硬件设计，并对设计出的硬件系统进行了软件编程和系统的调试，实验表明，该系统具有成本少、功耗低、尺寸小的特点，能以较高质量在100～150米范围内进行信号的无线传输。
上传时间： 2013-11-17
上传用户：1234xhb
采用晶片为nRF24E1,该晶片是工作于全球开放的2.4GHz频段，125个频道，高性能单片式无线收发晶片，内置高性能增强型51单片机(4clock)，内含4组ADC12bit高速采样，单片机全速运行时功耗1mA。
上传时间： 2013-11-05
上传用户：wojiaohs
