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基于單總線式無線溫度采集系統設計

為提高溫度測量效率，降低系統的成本，擴展傳輸距離，設計出一種新型溫度采集系統。單片機通過控制具有單總線方式的溫度傳感器DS18B20實現對溫度的測量，同時單片機通過控制具有單總線方式300～450MHz頻率范圍內的MAX7044與MAX7033無線發射與接收芯片實現溫度數據的無線傳輸。與傳統溫度采集系統相比，該系統利用單總線方式連接，采用無線傳輸方式實現遠距離通信，易于系統的集成與擴展。實驗結果表明，該系統結構簡單、方便移植，能夠同時實現多達上百點溫度的測量與500m范圍的傳輸。 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.

標簽： 單總線無線溫度采集系統設計

上傳時間： 2013-10-29

上傳用戶：515414293
基于CAN總線的綜自通訊規約設計

介紹一種基于CAN總線的牽引變電站自動化系統通訊規約的設計，CAN通訊規約采用標準幀，報文采用主動發送和發送查詢兩種處理形式。該設計在城市輕軌與地鐵牽引變電站中的應用表明：可實現間隔層和通訊處理層的數據快速、可靠的交換，提高牽引變電站的安全性和穩定性。 Abstract: This paper firstly presents a kind of design dealing with communicational protocol to the traction substation automation system based on CAN bus,and then comes up with the ideas that all frames of CAN communicational protocol should adopt the standard frame,and that messages be processed by two ways:sending initiatively and sending quiries.Subway and light rail application shows that the use of the CAN bus is possible to exchange data quickly and reliably between the layers of the middle and the communicational processing,hence to improve the safety and stability of traction substations.

標簽： CAN 總線通訊規約

上傳時間： 2013-11-07

上傳用戶：bs2005
基于CC1110單片機公交報站系統的設計

基于CC1110單片機公交報站系統主要由CC1110單片機最小系統和WT588D語音模塊組成，提出了如何實現語音報站，通過無線通信SimpliciTI網絡協議實現公交站臺的自動播報和OLCD液晶顯示公交運行的各類信息。結果表明，該公交報站系統報站準確率99%，價格比同類產品下降了300%以上，系統組成結構簡單，提高了系統的抗干擾性和穩定性，也便于攜帶。 Abstract: The bus stop announcement system based on CC1110 MCU is composed of CC1110 MCU minimum system and WT588D voice module. How to achieve the voice announcing is put forward.The bus-stop will announce automatically and display on the OLCD by means of wireless communication SimpliciTI network protocol. As a result， the bus station stop announcement systems reported 99% accuracy rate， price of similar products declined by 300% or more， system of simple structure， improve the anti-jamming and stability of the power system， it is also portable.

標簽： 1110 CC 單片機公交報站

上傳時間： 2013-10-21

上傳用戶：baby25825
基于MSP430F149的無線環境監測傳感器系統設計

為了提高環境參數采集的自動化水平，提升效率，設計了無線傳感器系統。本系統運用了傳感器技術、通信技術和單片機技術，實現了對環境溫度、濕度、光照度以及可燃性氣體濃度等參數的檢測。它能夠實時地與上位機進行無線通信，滿足對環境參數實時監測的要求。 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.

標簽： 430F F149 MSP 430

上傳時間： 2013-11-22

上傳用戶：longlong12345678
MAX7456在可視倒車雷達中的應用

為解決傳統可視倒車雷達視頻字符疊加器結構復雜，可靠性差，成本高昂等問題，在可視倒車雷達設計中采用視頻字符發生器芯片MAX7456。該芯片集成了所有用于產生用戶定義OSD，并將其插入視頻信號中所需的全部功能，僅需少量的外圍阻容元件即可正常工作。給出了以MAX7456為核心的可視倒車雷達的軟、硬件實現方案及設計實例。該方案具有電路結構簡單、價格低廉、符合人體視覺習慣的特點。經實際裝車測試，按該方案設計的可視倒車雷達視場清晰、提示字符醒目、工作可靠，可有效降低駕駛員倒車時的工作強度、減少倒車事故的發生。 Abstract: A new video and text generation chip，MAX7456，was used in the design of video parking sensor in order to simplify system structure，improve reliability and reduce cost. This chip included all the necessary functions to generate user-defined OSDs and to add them into the video signals. It could be put into work with addition of just a small number of resistances and capacitors. This paper provided software and hardware implementation solutions and design example based on the chip. The system had the characteristics of simplicity in circuit structure，lower cost，and comfort for the nature of human vision. Loading road test demonstrates high video and text display quality and reliable performance，which makes the driver easy to see backward and reduces chance of accidents.

標簽： 7456 MAX 可視倒車中的應用

上傳時間： 2013-12-10

上傳用戶：qiaoyue
基于DSP與FPGA的多視頻通道的切換控制

為了擴大監控范圍，提高資源利用率，降低系統成本，提出了一種多通道視頻切換的解決方案。首先從視頻信號分離出行場信號，然后根據行場信號由DSP和FPGA產生控制信號，控制多路視頻通道之間的切換，從而實現讓一個視頻處理器同時監控不同場景。實驗結果表明，該方案可以在視頻監控告警系統中穩定、可靠地實現視頻通道的切換。 Abstract: To expand the scope of monitoring， improve resource utilization， reduce system cost， a multiple video channels signal switching method is pointed out in this paper. First， horizontal sync signal and field sync signal from the video signal are separated， then control signal according to the sync signal by DSP and FPGA is generated to control the switching between multiple video channels. Thus， it achieves to make a video processor to monitor different place. Experimental results show that the method can realize video channel switching reliably， and is applied in the video monitoring warning system successfully.

標簽： FPGA DSP 視頻通道切換控制

上傳時間： 2013-11-09

上傳用戶：不懂夜的黑
8259 VHDL代碼

a8259 可編程中斷控制 altera提供 The a8259 is designed to simplify the implementation of the interrupt interface in 8088 and 8086 based microcomputer systems. The device is known as a programmable interrupt controller. The a8259 receives and prioritizes up to 8 interrupts, and in the cascade mode, this can be expanded up to 64 interrupts. An asynchronous reset and a clock input have been added to improve operation and reliability.

標簽： 8259 VHDL 代碼

上傳時間： 2014-11-29

上傳用戶：zhyiroy
基于碼本映射的語音帶寬擴展算法研究

在現代通信系統中，電話語音的頻帶被限制在300 Hz～4 kHz的范圍內，帶來了語音可懂度和自然度的降低。為了在不增加額外成本的前提下提高語音的可懂度和自然度，進行了電話語音頻帶擴展的研究。提出了一種改進的基于碼本映射的語音帶寬擴展算法：在碼本映射的過程中，使用加權系數來得到映射碼本。客觀測試結果表明，用此算法得到的寬帶語音的譜失真度比用一般的碼本映射降低至少2%。主觀測試結果表明，用此算法得到的寬帶語音具有更好的可懂度和自然度。 Abstract: In modern communication systems， the bandwidth of telephone speech is limited from 300Hz to 4 kHz， which reduces the intelligibility and naturalness of speech. Telephone speech bandwidth extension is researched to get wideband speech and to improve its intelligibility and naturalness， without increasing extra costs. This paper put forward an improved algorithm of speech bandwidth extension based on codebook mapping. In the process of codebook mapping， weighted coefficients were used to get mapping codebook. Objective tests show that spectral distortion of wideband speech obtained by this algorithm reduces at least 2%， comparing to conditional codebook mapping. Subjective tests show that the wideband speech obtained by this algorithm has better intelligibility and naturalness.

標簽： 映射帶寬擴展語音

上傳時間： 2014-12-29

上傳用戶：15501536189
MEMS慣性傳感器的焊接指南

Abstract: Standard PCB design and mounting processes can adversely influence MEMS inertial sensors.This application note contains guidelines for the layout, soldering, and mounting of MEMS inertialsensors in LGA packages in order to reduce stresses and improve functionality.

標簽： MEMS 慣性傳感器焊接

上傳時間： 2014-01-15

上傳用戶：sjb555
如何選擇補償的硅壓力傳感器

Abstract: This reference design provides design ideas for a cost-effective, low-power liquid-level measurement dataacquisition system (DAS) using a compensated silicon pressure sensor and a high-precision delta-sigma ADC. Thisdocument discusses how to select the compensated silicon pressure sensor, suggest system algorithms, and providenoise analyses. It also describes calibration ideas to improve system performance while also reducing complexity andcost.

標簽： 如何選擇補償硅壓力傳感器

上傳時間： 2013-10-08

上傳用戶：sjy1991