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The of ce or home robot discussed in this chapter is a very practical and useful application and is de nitely achievable. All the hardware required by the simulated system can be implemented with current technology. Some of this technology can be expensive, but the beacon algorithm proposed in Fig. 15.14 is easily attainable with a modest budget. Those with a larger budget and access to more sophisticated electronics can implement the more complex but more robust alternatives using a GPS or INS. Perhaps some company will realize the value of the beacon system described in this chapter. We suspect many hobbyists would purchase a set of remote controlled beacons (or beacons that emit a coded identi er) if they were available at a reasonable price. Such a product would make a useful home/of ce robot very feasible. The INS alternative required no slip as implemented in Fig. 15.13. However, we can achieve some tolerance for slip if we could ensure a method for updating the robot with a corrected position and heading at, say, each node in the path network (see Fig. 15.7). We also may have to redesign the path network to include more nodes and thus more frequent updates and less distance during which the robot can incur errors. We can place some form of identifying device at the nodes [perhaps magnetic encoded pulses or radio frequency identi cation tags (RFID)], which the robot can use to identify the node it is currently at. Combined with the Nodes[ ] array the robot can update its x, y position. To update the heading the node can be given a way of telling the robot where north is and the robot can correct its assumed heading value. If you look at Fig. 15.7 you may get an idea of

An Internet resource is accessed using a Universal Resource Locator (URL). A URL is composed of three elements: the transfer protocol, the hostname, and the pathname. The transfer protocol and the hostname are separated by a colon and two slashes, ://. The pathname always begins with a single slash.

The transfer protocol is usually HTTP (Hypertext Transfer Protocol), indicating a Web page. Other possible values for transfer protocols are gopher, ftp, and file. As their names suggest,

gopher and ftp initiate Gopher and FTP sessions, whereas file displays a local file on your own system, such as a text or an HTML file. Table 20-1 lists the various transfer protocols. Table 20-1: Web Protocols Description Hypertext Transfer Protocol for Web site access Access Gopher site File Transfer Protocol for anonymous FTP connections Makes a telnet connection Access WAIS site Reading Usenet news; uses Net News Transfer Protocol (NNTP)

The algorithms in this chapter will use programming constructs that allow for repeating a section of code many times. We will discuss the various constructs to achieve this. Also, RobotBASIC has commands to obtain input from the user and to display output back. The two devices for accepting input are the Keyboard and the Mouse. The device for displaying output is the Screen. 4.1.1 VARIABLES A variable is a storage space for holding a number or a string (text). A variable name is assigned to the storage space for use in a program. A variable name must start with a letter followed by any combination of letters and numbers. A variable can be used anywhere a number (or string) is needed. Of course you must assign the variable a value before using it.

Most Web browsers are designed to access several different kinds of information Web browsers can access a Web page on a remote Web site or a file on your own system Some browsers can also access a remote news server or an FTP site The type of information for a site is specified by the keyword http for Web sites, nntp for news servers, ftp for FTP sites, and file for files on your own system To access a Web site, you enter http:// followed by the Internet address of the Web site If you know a particular Web page you want to access on that Web site, you can add the pathname for that page, attaching it to the Internet address Then simply press ENTER The browser connects you to that Web site and display its home page or the page you specified.

F I G U R E 2-2

You can just as easily use a Web browser to display Web pages on your own system by entering the term file followed by a colon, file:, with the pathname of the Web page you want to display You do not specify an Internet site Remember, all Web pages usually have the extension html Links within a Web page on your own system can connect you to other Web pages on your system or to Web pages on remote systems When you first start a Web browser, your browser displays a local Web page on your own system The default page on Red Hat is a local page with links to the Red Hat Web site where you can obtain online support If you want, you can create your own Web pages, with their own links, and make one of them your default Web page.