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To set up a home network, you need a network adapter (an NIC) installed on each PC The network adapter can be installed internally as a PCI card on desktop PCs and as a PC card on notebooks Or, it can be an external unit connected via a USB cable An Ethernet adapter is built in to most modern desktops and all notebooks Other popular types of home network NICs are the HomePlug powerline adapter, the HomePNA phoneline adapter, and the wireless adapter Table 18-1 provides a summary of costs, speeds, and advantages of these technologies, all of which can be mixed in a single home network The HomePlug adapter is usually an external or wallmount unit that links to the PC via an Ethernet or USB cable In either case, you plug the unit into a normal AC

MaxBotix (wwwMaxBotixcom) offers three different lines of ultrasonic range finders The LV-MaxSonar line includes five sensors that differ primarily in the beam width for object detection (see Figure 18-1, which is adapted from the MaxBotix documentation) In order to provide Octavius with the widest possible range of

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power outlet just as you would any other appliance Both electricity and data flow to the adapter The HomePNA adapter usually is a PCI card in a desktop or a USB external unit In either case, a regular telephone wire with RJ-11 connectors links the adapter and the telephone wall jack The phoneline adapters link PCs via the regular phone lines that run throughout the house The phoneline home network adapters work on a different frequency than your voice conversations and your DSL broadband signal (which also is delivered over telephone lines), so you can use your telephone while data flows between your computers and over the Internet The other option is the wireless home networking adapter Again, these can be internal or external devices The internal wireless network adapter is a PCI card in desktops and a PC card on notebooks (see Figure 18-1) The wireless adapters, which link to an access point, eliminate the need for extra wiring and give you flexibility to move about and around the house if you re operating from a notebook PC The transmission speeds for wireless home networking are comparable with HomePNA and HomePlug (see Table 18-1)

vision, I chose the EZ0 unit because it offers the widest beam width as well as the longest range of object detection As you can see in Figure 18-1, with a 5V supply, the EZ0 is capable of detecting a 1-inch (25-cm) dowel at a distance of almost 10 feet (3 meters)

Sets the amount of memory (in kilobytes) allowed for internal PostgreSQL database maintenance operations These functions include creating table indexes, removing deleted records, and altering existing tables This value is in kilobytes, so the default value is 16MB

Figure 18-1

At this point, you may want to visit the MaxBotix site and download the EZ0 datasheet for reference during the following discussion

(Photo courtesy of US Robotics)

The LV-MaxSonar units can be operated at either 33V or 5V with a surprisingly low current draw of 2mA They automatically update their ranging data every 50mS and simultaneously output the data in three different formats (analog voltage, PWM, and standard serial data) that are all

Often, the residential gateway will have a USB port If this is the case and two of the PCs to be networked are in the same room as the gateway, then one of them can be linked with a USB cable, thus eliminating the need for any special network adapters

easy to interface with any PICAXE processor I think the analog voltage output is the simplest of the three formats because it doesn t require any coordination with the master processor; the latest reading is always available for the processor to input as an analog voltage whenever it s convenient In addition, the math involved in converting the ADC reading to a distance is about as easy as it gets because the scaling factor for the sensor s analog voltage output is Vcc /512 per inch Since the readadc10 command divides Vcc into 1024 steps, we just need to divide the ADC result by 2 in order to obtain the distance to the nearest object in inches Finally, the LV-MaxSonar units can easily be daisy-chained so that multiple sensors can be operated simultaneously without interfering with each other Although we won t be using that feature in this chapter, keep it in mind

This feature sets the size of the PostgreSQL server s execution stack level This limits the number of processes that can wait for execution The value is in kilobytes, so the default value is 2MB

Figure 18-1

If you design a home network with at least one wireless link, you will need an access point or AP The AP is a communications hub that enables the transceivers embedded in the wireless network adapters to link to the home network via short-range radio

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