Team leader: Brad Lowe Team members: Marshalia Green

John Thompson Lutrisha Johnson

Faculty Advisor: Dr. Robert Reese

Team Responsibilities

Research Documentation Website Micro-controller

Component Interfacing

PowerSupply

Marshalia Green

X X X X

Lutrisha Johnson

X X X X

Brad Lowe X X X X

John Thompson

X X X X

Presentation OutlineI. IntroductionII. SimulationIII. TestingIV. Future WorkV. Demonstration

MotivationEnergy Conservation

Decrease Energy Costs

Convenience

Design Diagram

Light

Control Unit01

Sensor

MotionSensor

Design Requirements• Power (operate from house @ 120V AC)

• Size (light switch, 4.5 in x 3.5 in x 1.5 in)

• Installation (anyone with basic knowledge of electrical wiring)

• Life Expectancy (10 years)

System Components

•Photoelectric Beam Sensors

•Motion Detector

•PIC Microcontroller

Power Supply Requirements3 doorways = 6 beams1 beam = 10V @ 25mA6 beams = 10V @ 150mA

PIC = 5V @ 100mA

Light control relay = 10V @ 100mA

Total DC Current = 350 mA

Prototype of Power Supply

Power Supply Components

Transformer (10V @ 1A)

Bridge rectifier

Capacitor

Voltage Regulator (7805)

Size of Transformer:

1.38 in X 1.88 in

Simulation Power Supply

Power Supply Test5V

Very small current ripple

120V AC

Beam Testing

5V on

0V off

Results of Beam Testing

Power consumption

Data Sheet: 10V @ 25mA

Measured: 10V @ 16mA

Beam detection length = 14 ft

Cost Analysis (Prototype)

The total cost for the system is $99.82.

Beams $60.00Motion Detector $20.00Microcontroller $4.62Transformer $6.00Voltage Regulator $0.75Rectifier $0.52Relay $3.99Capacitor $0.85Power Mosfet(relay control)

$1.99

Fuses/Fuse Holder $1.10

Prototype

SummaryPower supply for beams:• Functions properly

Power supply for circuit:• Complete

Microcontroller:• Programming not complete

Motion Detector:• Acquired, but being tested

Future Work• Complete Testing and Debugging

of Design

• Board Fabrication

• Packaging

Timeline

   

Tasks August September October November December

1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

Order Parts                                        

Fabricate PC Board

                                       

Place Parts on PCB

                                       

Test Design                                        

Debug Design

                                       

Final Packaging

                                       

Presentation                                        

Demonstration