1. Happy Home Helper Electrical Design Presentation Jeremy Searle Mar 17, 2004

2. Background  Home Automation is used for various household controls (lights, security, entertainment)  Systems tend to be expensive  Systems completely rely on the home PC which can be unreliable (Hackers, Crash, Power Surge, Virus)  Systems must be programmed to accomplish tasks and do not learn

3. Problem Statement To design a home automation system that is capable of learning and executing daily routines at an economical cost.

4. Solution  Central micro-controller unit  Outlet control modules  PC user interface  Sensors to control lights/sense walking path  Remember routines by averaging sensor data and user input data  Wireless communication between devices  Computer controlled window and door mechanisms

5. System Overview Central uController Outlet Module Data Flow Human Input Misc. Sensors

6. Outlet Module Overview Serial Input/Output to/from Central uController Power from wall outlet Current Sensor Relay Device to be controlled by Outlet Module uController AC/DC converter Serial Input/Output to/from Peripherals (sensors, actuators)

7. Outlet Module Circuit

8. AC/DC Converter

9. Relay Circuit

10. Current Sensor Allegro ACS750xCA-050 Senses Current up to 50 Amps Very low resistance for low power loss (R = 130 uOhms)

11. Central Micro-Controller Overview Serial Input/Output to/from Outlet Modules Serial Input/Output to/from PC NVRAM uController RTC

12. Schedule

13. Thank You Any Questions ?