1. Automatic Light Control Device Team leader: Brad Lowe Team members: Marshalia Green John Thompson Lutrisha Johnson Faculty Advisor: Dr. Robert Reese

2. Team Responsibilities

3. Abstract With the current electricity shortage, energy conservation has become a heavy consideration. Although it makes up 17% of all electricity consumed nationally, lighting is often overlooked as a potential source of conserving energy. The automatic light control device will use photoelectric beams to detect and keep track of the occupants of a room, keeping the lights on until the last person leaves. This system could potentially reduce light usage of a room by as much as 55%.

4. Energy Consumption Comparisons

5. Money Saving Potential • For a room with 64 20-W fluorescent bulbs, 1.28kW of power is consumed hourly. • Studies by the Department of Energy suggest that interior lights are needlessly on for an average of 6 hours per day. • Using the ALCD would produce a yearly savings of $140 (at $0.06 per kWh).

6. Disadvantages of Current Light Control Systems • Motion and audio sensors are susceptible to activation due to false signals, and they may turn off lights if occupant stays still or remains silent. • False activation causes the lights to needlessly cycle, which consumes more power than if they were to stay on continuously.

7. Control Unit Light Sensor Motion Sensor Design Diagram 01

8. Design Requirements • Power consumption: • System will operate at 120V 60 Hz AC • Control unit will consume a negligible amount of power (< 1.5W). • Size • Control unit must fit in a standard light switch socket (4.5” x 3.5” x 1.5”)

9. Design Requirements • Installation • Comparable to installing a light switch (can be done by anyone with basic knowledge of electrical wiring) • Life expectancy • Minimum life expectancy of 10 years

10. Design Requirements • Expandability/Adaptability to Environment • Adaptable to incandescent or fluorescent lights via a toggle switch • Able to manage up to 3 doorways • Optional light sensor can prevent switch operation if light level is high enough from outside sources, such as a window

11. PIC Microcontroller • Photoelectric Beam Sensors • Motion Detector System Components

12. Test Specifications

13. Schematic of Power Supply

14. Simulation Results of Power Supply

15. Schematic of Voltage Regulator

16. The End