基于PIC单片机的智能小区监控系统的设计

介绍了一种基于PIC单片机的智能小区监控系统,实现了水表、电表、煤气表的自动抄表,以及火灾、煤气泄漏、入室盗窃等安防监控.阐述了系统的软硬件设计以及PC机与多台PIC单片机的串行通信方案.     

PIC单片机应用于小区监控系统

该文谈了一种基于PIC单片机的智能小区监控系统,实现了水表、电表、煤气表的自动抄表,以及火灾、煤气泄漏、入室盗窃等安防监控。详细阐述了系统的软硬件设计以及PC机与多台PIC单片机的串行通讯方案。运用了单片机有关的软硬件技术。     

PIC单片机应用于小区监控系统

该文谈了一种基于PIC单片机的智能小区监控系统,实现了水表、电表、煤气表的自动抄表,以及火灾、煤气泄漏、入室盗窃等安防监控。详细阐述了系统的软硬件设计以及PC机与多台PIC单片机的串行通讯方案。运用了单片机有关的软硬件技术。     

Microchip推出内置分流稳压器的PIC单片机

Microchip Technology（美国微芯科技公司）推出配备多种外设的通用闪存PIC单片机，有助于实现更具成本效益的风扇或小型电机控制。全新14引脚PIC16F616／610和8引脚PIC12F615／609单片机集成了多种专用外设，可大大减少系统所需的元件，降低成本。这些外设包括具有死区控制的全桥脉宽调制（PWM）、用于脉宽测量的Timerl门、霍尔效应传感器接口比较器，以及具有温度和其他监控功能的数／模转换器。同系列器件PIC16HV616／610和PIC12HV615／609增加了内置分流稳压器，使PIC单片机无需另加稳压器就可以在更高电压轨上运行。     

基于嵌入式技术的电气安全智能监控系统设计

本文提出了一种基于双单片机的现场监控器和ARM＋LINUX＋QTE的集中数据监控器,并通过Internet实现远程监控的电气安全智能监控系统。介绍了该系统总体架构和软硬件设计以及所需关键技术的实现,包括PIC单片机I^2C通讯、嵌入式Linux操作系统移植及驱动程序开发、Qt/Embedded开发环境的建立、TCP通信实现远程监控。     

基于RS-485的多电极电磁流量计的远程监控

在简介多电极电磁流量计结构和测量原理的基础上．给出了监控系统的总体结构框图。重点讨论多电极电磁流量计与上位机的数据传输问题，采用VC 6．0的通信控件MSComm，通过485接口实现了PIC16F877单片机与计算机的串行数据传输，最终实现了计算机对以PIC单片机为核心的多电极电磁流量计的远距离控制和数据传输。     

等离子体热处理工艺自动控制系统上位机监控软件的设计

讨论了基于PIC单片机的等离子体热处理工艺自动控制系统上位机监控软件结构 ,并利用VisualBasic制作了上位机监控软件 ,实现了对等离子体热处理工艺过程的实时监控和数据管理     

基于PIC32单片机的嵌入式远程控制器的设计

随着第三代智能网络视频监控技术的迅速发展,嵌入式网络监控设备的使用也越来越广泛。为解决远端智能网络监控设备更新维护与管理难度大、成本高的问题,应用PIC32MZ单片机设计了一种嵌入式远程控制器。该控制器充分采用POE(以太网供电)技术为控制器和网络监控设备供电,这样不仅大大减少了电源系统的复杂度,同时提高了系统供电的可靠性。该控制器将单片机与网络交换功能集成在一起,在单片机中嵌入精简的TCP/IP协议,利用Web Server实现管理端、控制器和远端网络监控设备的相互通信。通过管理平台或浏览器可以实现实时监控、远程更新以及断电复位等功能,整个系统设计兼顾成本、操作性以及安全性等方面,对目前的智能网络监控系统具有很高的实用价值。     

关于挖掘机监控系统的GPRS的程序设计

本文介绍了挖掘机监控系统的组成以及系统的实现功能,描述了G20模块的使用方法和相关的硬件设计,最后关于本系统的GPRS部分的软件设计作了详细说明。重点介绍了G20模块的AT指令的使用及流程和PIC单片机中的汇编程序设计。     

基于PIC单片机的螺杆式空气压缩机小型控制器

介绍了如何利用Microchip单片机设计的一种空气压缩机监控系统。PIC单片机具有的高稳定性,并且可以选择功能模块适合的型号来以最小的电路规模实现监控功能。软件实现上,主要介绍幕单页面的实现和通过消息机制协调各个功能模块。     

An improved immersed finite element particle-in-cell method for plasma simulation

The particle-in-cell (PIC) method has been widely used for plasma simulation, because of its noise-reduction capability and moderate computational cost. The immersed finite element (IFE) method is efficient for solving interface problems on Cartesian meshes, which is desirable for the PIC method. The combination of these two methods provides an effective tool for plasma simulation with complex interface/boundary. This paper introduces an improved IFE–PIC method that enhances the performance in both IFE and PIC aspects. For the electric field solver, we adopt the newly developed partially penalized IFE method with enhanced accuracy. For PIC implementation, we introduce a new interpolation technique to ensure the conservation of the charge. Numerical examples are provided to demonstrate the features of the improved IFE–PIC method.     

Analysing the convergence behaviour of the PIC detector

This paper analyses the convergence behaviour of the parallel interference cancellation (PIC) detector in code division multiple access (CDMA) systems. The paper introduces a general PIC detector model where it can be used to describe the interference cancellation process of the PIC detector with any type of tentative decision function. With this model, the PIC detector can be viewed as either a feedback system or an iterated-map neural network. Using the known results from previous stability analysis in these areas, the paper derives general conditions from which the sufficient condition for convergence of the PIC detector for a wide range of tentative decision functions can be calculated. As examples, the paper derives the sufficient condition for convergence of the PIC detector with linear decision, clip decision and hyperbolic tangent decision functions.     

Parallel particle simulation in high voltage diodes (Algorithms and concepts for implementation on SUPRENUM)

A two-dimensional Particle-In-Cell (PIC) code has been developed in order to support the experimental investigation of pulsed power ion diodes by numerical simulation. The PIC code serves to simulate the orbits of electrically charged particles in electro-magnetic fields. Most modules of the PIC code have been vectorized; for parallelization the logical structure of the code is being considered. In this paper we introduce the idea of a PIC code, outline the single modules, and present concepts for implementation on SUPRENUM.     

Estimating percent impervious cover from Landsat-based land cover with a simple and transferable regression model

Percent impervious cover (PIC) is a widely used metric in ecological and hydrological analyses because it is highly correlated with pollutant and storm water run-off. The moderate-resolution satellite data (e.g. Landsat), that are typically used to calculate PIC, tend to overestimate PIC for all but very rural and very urban landscapes. Existing models for calibrating PIC estimates (e.g. ISAT, ETIS) are limited in that they are applicable only for specific land cover datasets and may also require population data; furthermore, these models have not been tested for performance outside of the geographic locations in which they were developed. The goal of this study was to explore simple but widely applicable regression models as tools for calibrating PIC estimates based on moderate resolution satellite data. The regression models used impervious land cover, from Landsat-based datasets, as the sole predictor of actual PIC. PIC was calculated for analysis units, ranging in size from 2.25 ha to ≥100 ha, for locations in Connecticut, Massachusetts, and Ohio in the United States. Regression models were fit for each size class of analysis unit at each study location; generalized versions of the models were created by fitting a regression to all size classes of analysis units at a given study location. Calibrated PIC estimates had root mean square error (RMSE) values that ranged from 1.5–10.7%; these values were considerably better than RMSE values for uncalibrated PIC estimates which ranged from 10.1–23.3%. For both calibrated and uncalibrated PIC, the accuracy of the estimates improved with the increasing size of the analysis units. Model regression coefficients were similar regardless of the analysis unit size, geographic location, or land cover dataset; model performance declined only slightly when applied outside the area in which it was developed. The simple regression models developed in this study had similar performance to previous calibration models (i.e. ISAT, ETIS) but are easier to apply and more widely applicable.     

An information age opportunity — Providing information for customers

Evolutionary growth of the use of information technology in business operations now provides a new information-age opportunity for managers, that of providing information for customers (PIC). In the PIC applications, information is a product not a resource and the product is information, not data. Pertinent examples of firms using PIC and steps to be taken by any firm that desires to implement this concept are explained in some detail. This application of computer technology usually can be implemented at minimal costs. PIC provide competitive advantages to the firm by tangibilizing various information services for customers.     

PIC16C74单片机应用与编程探讨

PIC系列单片机以其高性价比获得了日益广泛的应用,本文以PIC16C74为对象,对它的实际应用与编程中的一些具体问题做一探讨。     

基于PIC单片机的电能量管理系统的设计

根据供电系统对电能量管理的控制要求,采用PIC单片机为核心电路,设计了实用可靠的小负荷电能量管理系统.介绍了电能量管理系统的主要功能及其结构组成、PIC系列单片机的技术性能、用PIC16F73型单片机构成的控制流程以及电路设计要点等.     

基于PIC单片机的单摆智能测量控制系统

介绍一种基于PIC16F873单片机的单摆智能测量控制系统,该系统通过固定于凹槽内的光电门对单摆摆球的摆动次数进行采样,利用单片微处理器进行自动计数、自动测量,并自动计算和显示重力加速度g的数值,达到快捷、精确和自动测量的目的。     

On parallel PIC versatility and the structure of parallel PIC approaches

We discuss insights gained from an effort to develop a versatile parallel PIC code (PICARD – PIC with arbitrary rebalancing and decompositions). Because of the highly dynamic nature of PIC, it is sometimes necessary to tailor decomposition strategies on a problem-by-problem basis instead of solely on the basis of the algorithm. The dynamics of a problem may dictate the particular strategy to be used. Thus, finding a general operational method for parallel PIC applications is important. We find approaches to partitioning the mesh and particle domains which provide some trade-off opportunities, but the relationship enforced between the partition layouts in addition to the way one chooses to manage the problem's dynamics defines categories of strategies which are independent of the partitioning technique used. The overall strategy enforced is as important as the individual techniques applied to partition the domains. Three strategy groups arise from the analysis and form the basis of widely disparate parallel PIC operational methods. These distinct solutions are obtained from rather simple parametric choices. We introduce the concept of rubber boundaries as a means to bring a compromise between what are commonly referred to as Lagrangian and Eulerian particle mappings. We show several parallel PIC strategies that are as yet unexplored. © 1997 John Wiley & Sons, Ltd.     

Fast parallel Particle-To-Grid interpolation for plasma PIC simulations on the GPU

Particle-In-Cell (PIC) methods have been widely used for plasma physics simulations in the past three decades. To ensure an acceptable level of statistical accuracy relatively large numbers of particles are needed. State-of-the-art Graphics Processing Units (GPUs), with their high memory bandwidth, hundreds of SPMD processors, and half-a-teraflop performance potential, offer a viable alternative to distributed memory parallel computers for running medium-scale PIC plasma simulations on inexpensive commodity hardware. In this paper, we present an overview of a typical plasma PIC code and discuss its GPU implementation. In particular we focus on fast algorithms for the performance bottleneck operation of Particle-To-Grid interpolation.