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An IR-only transmitter, such as the Powermid XL, is the simplest of these devices and will allow you to remotely control devices without installing cables or sockets. TV senders are the wireless versions of the over-the-aerial cables or old TV distribution systems, which involved an aerial amplifier and a separate aerial cable into each TV in the house. There are...
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This itself is a good hack, but there are also cables to provide two- way serial communication, either between the Dreamcast and a PC or between peripherals such as infrared (IR) transmitters and receivers. You can either build this cable yourself using one chip and three capacitors from the circuit shown at http://mc.pp.se/dc/serifc.html or purchase a similarly. You can find...
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This is provided as a single archive from the web site at http://arduino.cc/en/Main/Software. Extract this to an appropriate directory (root access is not required for any of these steps), and run ./arduino from the directory. You can begin a project by selecting File ➤ New from the menu. This creates what the Arduino IDE calls a sketch. This involves a...
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73 There are many Arduino shields on the market, most with freely available specifications and circuit diagrams. It is based on the Wiznet W5100 chipset and uses digital pins 10–13 to communicate.. With this knowledge, you can build a simple circuit, write some Arduino software, and add a Linux-side script to trigger a piece of speech whenever someone enters or...
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Note All devices should be grounded accordingly, not as shown in the figures for clarity.. In the same way you can build complex and evocative systems using a couple of well-chosen pieces of hardware, so can you build smart automation tools with a minimum of effort. By using alternate input devices, such as pressure mats and joysticks, you can change...
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However, if the RAID system has a problem and uses a custom disk format, then it might be impossible to recover the data on the disk. You can solve this by buying two pieces of hardware and verifying that you can swap the disks without a problem before they are put into active service. Alternatively, you can check with the...
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Their setup requirements are straightforward enough and covered in the online documentation and so won’t be covered here.. This is one of several devices that plays back media files through a TV or HiFi system. This device was launched in 2003 and is one of several that acts like an audio-only version of the MediaMVP with a similar scope for...
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Bluetooth, for example, is found on all current mobile phones, and although it is slightly power hungry, there are many free or nearly free applications that interface with a suitably equipped PC. This looks like a MAC address from traditional network scenarios and can be discovered with the following:. Note that there is a slight delay in scanning the area...
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This connects to the rest of the house via Cat5 and AV cables where the data is picked up by the following:. To be a truly effective smart automated home, you will need a server that’s on 24/7. Although many of the devices you’ve seen (such as the CM11U in Chapter 1) can be programmed to work offline, you only...
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133 the output waveform varies too and is usually governed by the cost of the device. The output of the. procedure will be initiated via the USB (or serial) cable so that the machine(s) connected to the UPS can close down safely. Each unit comes rated for a different VAs, indicating how much you can draw from it when it...
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143 Remember that all cables have different flexibilities, so when pulling them, it is best to be as careful as possible, as if they were all fragile. Don’t jerk the cable, because this causes friction on the sheath. There is no trick to the act of pulling cables, although doing so with a partner will more than halve the time...
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153 In Chapter 7, you’ll learn how to extend this functionality to support a basic address book and. Procmail is triggered by the e-mail server (an MTA, such as Exim) by passing each message for further processing to each of a series of recipes. If none of these recipes lays claim to the message, it is delivered as normal.. I’ll...
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163 You now have an alternate voice that, if installed correctly, can be proven with the Festival. It should now show us1_mbrola as a suitable voice, so you can test it with the following:. When you’re happy you’ve found a voice you like, you can make it the default by setting VOX in the previous script:. Having access to separate...
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You can update the error or output status through Ajax.. You can retrieve error states through a secondary command, issued after an asynchronously command invocation.. None of these are unsolved problems, but it is an extra layer of complexity for those wanting to write their own home automation web applications.. Although capable of being used to list general-purpose directories (as...
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To eliminate the sending of fiddly text messages (and perhaps save money), you can test future permutations of this script with a simple web page. Using the simpler format, you can write code such as the following:. You can further limit another issue (although not eliminate it) by changing your simply named echo.php script to iuytvaevew.php, employing security through obscurity...
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However, if you have a choice of just one gadget—a SatNav or a web-capable handheld PC—the latter can still win out with one of the live traffic web sites.. The United Kingdom has sites like Frixo (www.frixo.com) that report traffic speed on all major roads and integrate Google Maps so you can see the various hotspots. It also seems like...
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This can be particularly useful for receiving up-to-minute sports results, lottery numbers, or voting information from the glut of reality TV shows still doing the rounds on TV stations the world over. This encompasses any data that is purposefully requested when it is needed. One typical example is the weather or financial information that you might present at the end...
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message to different places, according to whether you are at home, at work, or on the train.. In addition to the periodic events, you will often want to invoke extra events, such as a reminder in ten minutes to check on the cooking. Again, Linux is prepared with the at command, such as the following:. minute” actually means “at the...
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You will see how this is able to communicate with other machines in the “Marple” section later in this chapter.. x10control: This is a simple abstraction that invokes heyu to switch lamps and appliances on and off and dim lights. Because the retrieval of this data can be quite slow, the track data is temporarily stored in /var/log/minerva so that...
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This causes any existing command script called $cmd present in /usr/local/minerva/etc/msg/. vox/cmd to be executed and includes typical commands to control the lights (lightson, lightsoff), audio mixer (mute, quiet, next), and status reports (such with time and status).. You can therefore persuade the computer to enact simplistic conversations by creating scripts such as hello:. /usr/local/minerva/etc/msg/vox/cmd/hello echo Hello. /usr/local/minerva/etc/msg/vox/cmd/time. $MINBASE=/usr/local/minerva. Although...