ECE Design Project
ECE Design Project ECE 4007
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This 0 page Class Notes was uploaded by Cassidy Effertz on Monday November 2, 2015. The Class Notes belongs to ECE 4007 at Georgia Institute of Technology - Main Campus taught by David Keezer in Fall. Since its upload, it has received 7 views. For similar materials see /class/233885/ece-4007-georgia-institute-of-technology-main-campus in ELECTRICAL AND COMPUTER ENGINEERING at Georgia Institute of Technology - Main Campus.
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Date Created: 11/02/15
Christopher Chidi ECE 4007 Section L05 Professor Keezer Group WaitLess Wireless Network Technology Embedded Serial to WiFi Modules Introduction Wireless technology has become prevalent in modern society as it presents a solution to the dilemma of making life easier by breaking down the networking barriers of distance and mobility In a study of the benefits of wireless LAN conducted in 20011 87 of survey respondents credited WLAN to an increase in their quality of life due to the exibility and mobility of wireless internet connectivity moreover WLAN has been attributed to a 22 productivity increase for end users The appeal of wireless networking has resulted in the vast expansion of WLAN infrastructure with millions of public private and commercial wireless access points dispersed around the globe 2 Consequentially the pervasive availability of wireless network access enables the potential for remote data transfer with a variety of electronic devices by means of embedded serial to Wi Fi modules For instance security and surveillance systems employ serial to Wi Fi modules to stream surveillance video from remotely mounted security cameras to wired network systems 1 The following review provides an analysis of the features and cost effectiveness of Wi Fi modules while highlighting the commercial applications of these devices Commercial Applications of WiFi Modules Application in Industry An increasingly popular application for Wi Fi modules is in industrial monitoring systems Emerson Process Management is among several instrumentation vendors developing wireless transmitters for industrial applications The Rosemount 3051s Wireless Series of Instrumentation features WirelessHART and 80211 Wi Fi capabilities for their pressure level and ow transmitters 3 Some of the advantages of the wireless transmitters include the ability to install transmitters in distant or low accessibility areas the elimination of the need for cable and conduit which reduces material and labor co st and the capability of bidirectional interaction between the transmitter and network enabling the execution of preventative diagnostics and maintenance from a centralized location The wireless output of the transmitters operates on either the 24 GHZ frequency band with DSSS modulation or 900 MHZ with FHSS modulation The networking system does require the allocation of several transceivers receivers located several hundred feet apart to route signals between the transmitters and hardwired gateways Although the instrumentation associated with the Rosemount Wireless Field Networks are relatively expensive compared to their hardwire counterparts as aforementioned a significant amount of project costs are saved when eliminating the material cost of cable and conduit as well as the labor cost of cable mounting Chevron for example saved two thirds of its quoted hardwire installation costs or 60000 in a recent installation of Rosemount wireless pressure transmitters for a steam injection service 4 Comparison of Available Consumer WiFi Modules As of early 2007 embedded serial to Wi Fi modules have become readily available in public consumer markets Each brand boasts similar features such as low power consumption and onboard wireless encryption or firewall security The following section will investigate two embedded serial to Wi Fi modules currently available on the market the WiFly RN 111B 80211b Wi Fi SuperModule 5 and the Secure Socket iWiFi module 6 The key feature of the WiFly device is its ultra low power module with 40 mA RX and 120 mA TX current usage which can be supplied on as low as a 2 3V low power battery source In addition the module supports a low power programmable sleep function which reduces power consumption to approximately 12uA The WiFly module is compatible with the IEEE 80211b standard and interacts with serial devices by means of a RS232 serial port in conjunction with UART Data transfer speeds range from 1200 bps up to 921 kbps Other features include a real time clock WEP128 and WPA WPA2 encryption 500 KB of ash memory 6 10 pins and 8 sensor inputs The typical retail price of this Wi Fi module is 6995 7 The developers of the iWiFi module also boast low power consumption with a 190 mA RX and a 260 mA TX current usage supplied on a 33V power source The Wi Fi module supports a power save mode which reduces power consumption to approximately 8 mA The iWiFi is compliant with IEEE 80211b and 80211g standards and the module interacts with serial devices through a custom ATi Serial Data Format or SerialNet mode Data transfer speeds can reach up to 3 Mbps in serial mode Other features of the iWiFi module include a random number generator capability to send and receive textual or binary email with MIME attachments retrieval of time data from a Network Time Server WEP and WPA WPA2 encryption 10 TCPU DP sockets and two listening sockets The retail price for the iWiFi module is 5900 however the antenna and cable are not included 8 Despite the fact that the Secure Socket iWiFi module is 1095 cheaper than the WiFly RN 111b one must be cognizant of the significantly larger power consumption of the iWiFi module which translates to greater long term energy costs Nevertheless each device possesses its own set of advantages and disadvantages which may prove valuable for certain applications Underlying Technology Technical Function Embedded serial to Wi Fi modules function as device servers bridging serial devices to 80211bg wireless LAN s The Wi Fi modules utilize RS232 serial ports in conjunction with UART to interact with serial machines Some Wi Fi modules such as the iWiFi employ custom serial protocols 6 Furthermore the modules are equipped with programmable processor chipsets with an OS that coordinates the data transfer between serial and IP protocols The Wi Fi modules connect to wireless access points by utilizing a built in wireless adapter IEEE Wireless LAN Standards IEEE 80211 contains a set of standards that govern WLAN implementation on the 24 36 and 5 GHz spectrum bands The two standards particular to embedded serial to Wi Fi modules are the 80211b and 80211g standards which are amendments to the original 80211 standard IEEE 80211b proposes a modulation technique that maintains a throughput of 45 Mbps and a net bit rate of 11 Mbps The 80211g standard employs a modulation method similar to the 80211a standard and maintains a throughput of 19 Mbps and a net bit rate of 54 Mbps The similarities between the 80211 b and g standards are that both define modulation on the 24 GHz band and devices implementing these standards are prone to interference by other electronics operating on the spectrum band The notable difference between the two standards is the capability of faster data transfer speeds on 80211g devices Implementation of Embedded Serial to WiFi Modules The typical embedded serial to Wi Fi module is designed for relatively simple installation The connections involve a DB9 pass through serial cable that links the module to a serial port terminal For most modules power is supplied by a 4 12 VDC unregulated 33V regulated or in some cases 2 3 V low power battery sources Initially users must configure the module by connecting to a PC and utilizing the provided installation software prior to connecting the module to a serial M2M device A potential difficulty associated with the installation of a Wi Fi module involves configuring the module for passing through a wireless network security gateway such as the Georgia Tech LAWN system However users can counteract this problem with adequate programming during device configuration
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