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Until a few years ago, networks of any kind were for businesses that could afford expensive communications gear and a salary for a network administrator These expenses and the required technical expertise made home networks prohibitive until now The term networking may be a bit threatening to some users, but creating a home network is surprisingly easy to do The moderate cost of home networking is easily justified with the savings you realize in resource sharing This chapter demystifies the home network by showing you what it can do, introducing you to the options, and explaining how to set one up in your home Homes with more than one PC are becoming increasingly common They may have one or more kids PCs, a parents PC, and, perhaps, a parent s notebook PC from the office This spread of PCs throughout the house has prompted an explosion in home networking

real estate More importantly, putting both resistors in every circuit provides just one more opportunity to make a mistake In my experience, it s better to tie the serin pin to Ground with a 100k resistor and keep the PICAXE programming circuit separate, as we have done with the USBS-PA3 That s the approach I will use throughout this book, but you can certainly modify any or all of the projects to include the programming circuit if you prefer In Part Two of the book, we ll construct additional programming adapters for specific purposes as the need arises, but the USBS-PA3 adapter is all we need to complete the projects in Part One

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The server firewall is the front door of the system on the network It can block attempts to access individual services on the server before the packets even get passed to the server applications This is the first line of defense in protecting your PostgreSQL databases from attack and intrusion There are many different network firewall products available on the market today, both free and commercial Microsoft Windows XP Home and Professional workstations with Service Pack 2 installed, as well as Microsoft 2003 servers, include a basic firewall application built into the operating system When the Windows Firewall application is enabled, it blocks all access to the PostgreSQL server service by default If you want network clients to be able to access your PostgreSQL server, you must manually configure the firewall application to allow access to the PostgreSQL server TCP port To start the Windows Firewall application on a Windows XP workstation, choose Start | Control Panel, click Network and Internet Connections, and then click Windows Firewall On a Windows 2003 server, choose Start | Control Panel and click the Windows Firewall icon When the Windows Firewall application is started, the main window appears, shown in Figure 10-1

OUR SIMPLE 45V BATTERY-POWERED supply was a quick and easy way to get started with our Hello World! project In fact, 45V is enough to power any current PICAXE processor, as you can see from the PICAXE supply ranges presented in Table 3-1 In addition, the M2-class chips, as well as the 20X2 and the low-voltage (3V) versions of the 28X2 and 40X2, can actually run on a 2-AA supply However, with a supply voltage that low, the downloading process is not always reliable, so if you design a low-voltage project, you will still need at least a 45V supply for downloading your program to the processor When designing a project, it s important to check the voltage requirements of each of the components that you may be using For example, many LCD displays require a 5V supply to function correctly, so a 3-AA supply isn t sufficient There s another problem with batterypowered projects that also must be taken into consideration: Over time, the output voltage will gradually decrease and then drop rapidly as the battery pack becomes depleted In projects as simple as Hello World! all that will happen is the LED will gradually grow dim and eventually not light at all However, if a project involves any sort of critical timing functions and/or analog-todigital conversion (ADC) voltage measurements, the accuracy of the program s computations will suffer as the voltage decreases over time Because of the problems associated with low-voltage battery supplies, it s a good idea to also have a regulated 5V power supply available for projects that require it In fact, it s simpler to power all your PICAXE projects with a regulated 5V supply, at least during the development stage, and only switch to battery power in the final version of a project that requires it Of course, you could always purchase a commercial 5V power supply for this purpose, but the fact that you re reading this book suggests that you prefer building your own equipment, so that s exactly what we re going to do in this chapter Also, we re going to use our 5V regulated supply project as a design study for the process of using Microsoft Word to develop stripboard layouts.

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