The LED display system LED (Light Emitting Diode), light-emitting diode, is a solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart of a semiconductor chip, the chip is attached to one end of a stent, is the negative side, the other end of the power of the cathode, the entire chip package to be epoxy resin. Semiconductor chip is composed of two parts, part of the P-type semiconductor, it inside the hole-dominated, the other side is the N-type semiconductor, here is mainly electronic. But linking the two semiconductors, among them the formation of a 'PN junction.' When the current through the wires role in this chip, will be pushing e-P, P zone in the hole with electronic composite, and then to be issued in the form of photon energy, and this is the principle of LED luminescence. The wavelength of light that is the color of light, is formed by the PN junction of the decisions of the material. 50 years ago, people have t

Structure and function of the MCS-51 Structure and function of the MCS-51 series one-chip computer MCS-51 is a name of a piece of one-chip computer series which Intel Company produces. This company introduced 8 top-grade one-chip computers of MCS-51 series in 1980 after introducing 8 one-chip computers of MCS-48 series in 1976. It belong to a lot of kinds this line of one-chip computer the chips have,such as 8051, 8031, 8751, 80C51BH, 80C31BH,etc., their basic composition, basic performance and instruction system are all the same. 8051 daily representatives- 51 serial one-chip computers . An one-chip computer system is made up of several following parts: ( 1) One microprocessor of 8 (CPU). ( 2) At slice data memory RAM (128B/256B),it use not depositting not can reading /data that write, such as result not middle of operation, final result and data wanted to show, etc. ( 3) Procedure memory ROM/EPROM (4KB/8KB ), is used to preserve the procedure , some initial data and form

An IOT Based Smart Shopping Cart Abstract. Todayrsquo;s world have a fast growing population with a wide range of demand from a variety of domains. Customers who need to purchase different products in Walmart or supermarkets needs lots of time and patience in coordinating among them self for successful shopping. We need to address this problem by efficiently using our technologies. In the advancement of technologies, the world is getting automated in many aspects. In this Paper, we depict reasonable and cost-effective Smart Shopping Cart utilizing IoT (Internet of Things) innovations. Such a framework is appropriate for use in spots such as Walmart amp; supermarkets, where it can help in lessening work and in making a superior shopping knowledge for the clients. Rather than influencing the clients to sit tight in a long line for looking at their shopped things, this framework helps in mechanizing the easy and comfortable billing process. The shopping is processed with two a

英语原文共 9 页， 一种低成本无线网络系统室内空气质量传感器的设计 Sherin Abraham 李欣荣 收到：2015年11月17号/接受：2016年1月21号/网络公布：2016年3月7号 施普林格科学 商业媒体纽约2016 摘要 一个室内空气质量监测系统对于检测并改善空气质量是很有帮助的。目前，这类能使用的监测系统十分的昂贵。在本文中，我们提出使用Arduino XBee模块、微气体传感器来开发一个低成本的室内空气质量无线传感器网络监控系统。这个系统能够同时从不同的地点采集六个空气质量参数。我们还提出了一种基于线性最小二乘估计的方法用于传感器校准和测量数据转换。在本文中，我们详细地介绍了无线空气质量传感器节点的设计及其校准方法。我们的系统与专业级的空气质量测量装置的测量结果进行比较证明了我们的系统的性能和实用

Based on MCU intersection traffic lights the controller design Because of the rapid development of our economy resulting in the car number of large and medium-sized cities surged and the urban traffic, is facing serious test, leading to the traffic problem increasingly serious, its basically are behaved as follows: traffic accident frequency, to the human life safety enormous threat, Traffic congestion, resulting in serious travel time increases, energy consumption increase; Air pollution and noise pollution degree of deepening, etc. Daily traffic jams become people commonplace and had to endure. In this context, in combination with the actual situation of urban road traffic, develop truly suitable for our own characteristics of intelligent signal control system has become the main task. Preface In practical application at home and abroad, according to the actual traffic signal control application inspection, planar independent intersection signal control basic using set

英语原文共 5 页， 基于无线传感网络的Zigbee温度检测系统 摘要：本文基于TI和ZigBee协议栈芯片CC2530，建立一个简单的无线传感器网络监测系统。本文主要针对ZigBee网络的构建和节点逻辑类型的配置方案进行了介绍，并介绍了ZigBee网络节点的组成，作为无线传感器网络监控系统的功能。 关键词：CC2530芯片；无线传感器网络；ZigBee协议 介绍 无线传感器网络的发展是出于军事上的应用，如战场侦察；今天这样的网络使用在许多工业和消费中都有不同程度的应用，比如工业过程的监测和控制，机器的健康监测、环境监测、医疗应用、家庭自动化、交通控制等。该网络可以识别，收集和处理网络内的信息，然后将它们发送给观察员。无线传感器网络技术在温度监测系统中的应用也是近年来研究的热点。 ZigBee是基于低速率�

英语原文共 40 页， LPC2114 / 2124 单芯片16 / 32位微控制器； 128 / 256 KB ISP/IAP 10位ADC闪存 一般描述 LPC2114 / 2124是基于实时仿真16位和32位ARM7TDMI-S CPU和嵌入式跟踪支持，连同128 / 256 KB的嵌入式高速闪存的记忆。128位宽度的内存接口和一个独特的加速器架构使32位代码执行在最高时钟速率。对于关键代码大小的应用程序，替代的16位Thumb模式将代码减少了超过30%最小性能惩罚。 其紧凑的64引脚封装，低功耗，各32位定时器，4通道10位ADC，PWM通道和46个快速GPIO线路和九个外部中断引脚，这些微控制器特别适用于工业控制、医疗系统、访问控制和销售点。具有宽范围的串行通信接口，它们也非常适合于通信阳离子网关、协议转换器和嵌入式软调制解调器以及许多其他通用应用程序。 备注：在整个数据表，术语LPC2114 / 2124将适用于设

An overview of microcontroller Description The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). Thedevice is manufactured using Atmelrsquo;s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. Function characteristic The AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry. In addition, th

英语原文共 1208 页， STM32F1xx HAL驱动描述 （ST公司，2020） HAL驱动程序概述 HAL驱动程序的设计目的是提供一组丰富的API，并方便地与应用程序上层进行交互。每个驱动程序都由一组功能组成，这些功能涵盖了最常见的外围功能。发展每个驱动程序都由一个通用API驱动，该API标准化了驱动程序的结构、函数和参数姓名。 HAL驱动程序包括一组驱动程序模块，每个模块链接到一个独立的外围设备。然而在某些情况下，模块连接到外围功能模式。例如，有几个模块用于USART外设：UART驱动模块、USART驱动模块、智能卡驱动模块、IRDA驱动模块。 HAL的主要特点如下： bull;跨系列的可移植API集，涵盖通用外围功能和扩展API特定外围功能的情况 bull;三种API编程模型：轮询、中断和DMA bull;API与RTOS兼容： –完全可重入API

Simulation and Optimization on Thermal Performance of LED Filament Light Bulb Wilson Feng*, Bruce Feng, Fanny Zhao, Brian Shieh, Ricky Lee HKUST LED-FPD Technology Ramp;D Center at Foshan, Guangdong, China Department of Mechanical amp; Aerospace Engineering Center for Advanced Microsystems Packaging Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China *E-mail: fengmx@fsldctr.org Abstract In the present study, a computational model of LED filament light bulb was established by the ANSYS Icepak software based on the finite element method (FEM) and was compared with the experimental data as well. With the developed model, the effects of the filling gas and the filament substrate on the steady-state thermal performance were investigated. The simulation results revealed that the thermal conductivity of the filling gas in the bulb had a significant influence on the heat dissipation of the bulb. Compared with air fil