This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
architecture [2011/11/15 22:07] jap |
architecture [2011/12/05 00:21] jap |
||
|---|---|---|---|
| Line 2: | Line 2: | ||
| This page is part of my [[projects|Home Automation]] project. | This page is part of my [[projects|Home Automation]] project. | ||
| + | The content is out of date at the monent. | ||
| + | |||
| + | <del> | ||
| The software has database centric architecture. Database is the key mechanism to exchange data in between lower layer (sensors and actuators) and upper layer (user interfaces and control logic). Each daemon and server is a separate process, which can be dynamically started or stopped without affecting the function of other processes. | The software has database centric architecture. Database is the key mechanism to exchange data in between lower layer (sensors and actuators) and upper layer (user interfaces and control logic). Each daemon and server is a separate process, which can be dynamically started or stopped without affecting the function of other processes. | ||
| Line 19: | Line 22: | ||
| {{:db_structure.png|}}\\ | {{:db_structure.png|}}\\ | ||
| //Database structure// | //Database structure// | ||
| + | <del> | ||
| ''MemDB'' is the primary data exchange database. It contains two tables: ''Variable'' and ''Value''. Each physical parameter, like sensor reading, actuator target value, etc. has one row in ''Variable'' table defining properties of the variable. Each variable may have several values, separated with timestamp. Current value is the one with latest timestamp. | ''MemDB'' is the primary data exchange database. It contains two tables: ''Variable'' and ''Value''. Each physical parameter, like sensor reading, actuator target value, etc. has one row in ''Variable'' table defining properties of the variable. Each variable may have several values, separated with timestamp. Current value is the one with latest timestamp. | ||
| Line 32: | Line 35: | ||
| Example:\\ | Example:\\ | ||
| - | Sensor //Outdoor Air Temperature// of ventilation unit may simultaneously belong to both ventilation measurements group and outdoor weather measurements group. | + | Sensor //Outdoor Air Temperature// of ventilation unit may simultaneously belong to both ventilation measurements group and outdoor weather measurements group.</del> |
| === Initialization === | === Initialization === | ||
| + | <del> | ||
| ''RamDB'' is located in RAM file system, thus all date is lost each time system boots. Due to that database needs to be re-generated during each boot. There are bunch of scripts that create the database. | ''RamDB'' is located in RAM file system, thus all date is lost each time system boots. Due to that database needs to be re-generated during each boot. There are bunch of scripts that create the database. | ||
| Line 91: | Line 94: | ||
| ); | ); | ||
| </file> | </file> | ||
| + | </del> | ||