TAILIEUCHUNG - Apress - Smart Home Automation with Linux (2010)- P29

Apress - Smart Home Automation with Linux (2010)- P29:Linux users can now control their homes remotely! Are you a Linux user who has ever wanted to turn on the lights in your house, or open and close the curtains, while away on holiday? Want to be able to play the same music in every room, controlled from your laptop or mobile phone? Do you want to do these things without an expensive off-the-shelf kit | CHAPTER 4 HOME IS HOME Having a primary server generally requires it to remain switched on 24 7. Centralizing the tasks to a single location and unifying all the services onto a single machine means that only the NodeO machine requires protection from power outages via a UPS or theft via a strong lock . Indeed the data most at risk is usually on stand-alone laptops so I ll cover backup plans for them later too. Determining the Best Room Even the humblest of abodes has several locations suitable as NodeO. Most people choose the closet under the stairs since it s central and therefore requires less wiring but there s more to it than that In fact while reading the next section you are expected to mentally move the server from one room to another as each problem or solution presents itself. Furthermore in some cases it s not physically possible to find one room that can solve all of the particular problems in which case you may have to drop the offending feature or use a second server in a separate location. Lawful Considerations Laws vary according to country and change over time so it is important to take the necessary advice and acquire any permissions before work is begun. In reality this affects very few people such as those who are building new structures on their land such as sun rooms or amending buildings that have been granted graded or listed status. Necessary Considerations The necessary considerations in this section cover the limits of particular pieces of hardware and their interconnects. Since the main server will need full unfettered access to all your equipment these considerations are of primary importance. X10 signals can dissipate and get swallowed whole by various devices placed around the house as mentioned in Chapter 1. Moving the Computer-X10 gateway CM11 to another socket can change its reach quite considerably so a lot of testing is necessary. Alas it might not be possible to place the device in any single location that allows the messages to

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