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Smart Home Automation with Linux- P15:I will end on a note of carefree abandon—learn to steal! Once you’ve learned the pieces of the puzzle and how to combine them, there is very little new to invent. Every new idea you discover is a mere permutation of the old ideas. And ideas are free! Every cool feature discussed on TV shows or presented in the brochures or web sites of commercial HA companies can be taken, adapted, and implemented with the information presented here using very little effort | CHAPTER 4 HOME IS HOME Audio power amplifier TV aerial booster This connects to the rest of the house via Cat5 and AV cables where the data is picked up by the following Media-playing head boxes Additional speakers Secondary audio amplifiers Personal laptops and desktop PCs Secondary TVs using aerial input Servers 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 get a sense of power when there is something ready willing and able to make decisions at any time of the day or night. And a timed light switch doesn t count. There are so many cool and interesting technologies in a home environment that it s very easy for the ideas to run away from themselves and for you start to place orders for the biggest and most powerful servers that you can t afford In reality there is no need to have only one server provided there is only one in overall charge. Purposes of Servers The workload of a server breaks down into three areas CPU processing power Disk space Bandwidth capabilities I ll cover these in order. CPU Power With a few exceptions home automation software takes very little power. All the standard tasks such as web servers e-mail alarm clocks SMS processing message routine and music playback require virtually no processing and the lowliest Mini-ITX is capable of handling everything without breaking a silicon sweat. Transcoding media from one format such as the high-definition DVD rip stored on your server into another a smaller version suitable for low-end hardware such as the MVP or for playback on your portable device is significantly more processor-heavy. Consequently it is not uncommon to have two main servers each one dedicated to these two main tasks. 123 CHAPTER 4 HOME IS HOME Disk Space Again most of the HA tasks don t require lots of hard disk space so if your operating system fits and they re approaching 1GB in
