SOLAR POWERED SOLAR POWERED SMART BLIND (SPSB) SMART BLIND (SPSB)

SYSTEMSYSTEM

Smart Home AutomationSmart Home Automation

SOLAR POWERED SMART BLINDSOLAR POWERED SMART BLIND

[11 March 2009]

Lai Li EENaing Oo EEKevin-Long Vo EEMarco Herrera CompE

GEORGIA INSTITUTE OF TECHNOLOGYGEORGIA INSTITUTE OF TECHNOLOGY

SOLAR POWERED SMART BLINDSOLAR POWERED SMART BLIND

• WHAT - Self-sustaining, fully automatic blinds

• WHY - Profitable market, convenient

• WHO - Disabled, senior citizens, automation enthusiasts

• COST - Competitive in prices with current products

SPSB System OverviewSPSB System Overview• Energy efficiency using solar power

• Blind will be fully automatic

• Manual override can be performed by the user

• Blinds auto adjust based on user input mode

• LCD will display date, time, room temperature, and current user select mode

Operational ViewOperational ViewStepper Motor

User Interface / Control BoxUser Interface / Control Box

02/14/2009 12:00 AM Mode: Bright

Indoor Temp: 27 C = 68 F

Manual Overrid

e Mode Select

DS1621 Temp

IC

e

02/14/2009 12:00 AM Mode: Bright

Indoor Temp: 27 C = 68 F

Manual Overrid

e Mode Select

DS1621 Temp

IC

e

Design Schematic

Arduino MCU

STEPPER MOTOR DRIVER

STEPPER MOTOR

POWER MANAGEMENT

SOLAR PANELS

AC ADAPTER

BATTERY

PHOTO-RESISTORS

BUTTONS

TEMP

RTC

LCD DISPLAY

I2C Communication

• Only two I/O ports

• Bi-directional communication

• Multiple slave devices

Light Detection

• Four photo-resistors

• Pull-down resistor network

• Sensitivity– VOUT (0V – 5V)

Stepper Motor / Driver

• Four wire bi-polar motor

• Current range (150mA - 750mA)

• Power supply range from 7V to 30V.

Power ManagementPower Management

Solar Cell NiCad Recharging Circuit

Algorithm Flow Chart

START

RTC

DELAY

5 MIN

ADJUST

BLINDS

READ SENSORS

ALGORITHMDAY?

YES

NO

Demonstration Plan

• Recorded video demo: recording of SPSB throughout a day

• Live demo: user input modes and the blinds let light in accordingly

Problems and Issues• Electrical

Solar power might not be sufficient to power whole unitSolution: AC-DC power adaptor

• MechanicalStepper motor with driver might not provide enough torqueSolution: Servo motor with feedback

Budget and Cost Analysis

Current Expenditure

Sales3%

24%

21%24%

14%

14%

Blinds

Microcontroller

Power SupplySystemSensors/RTC/LCD

Stepper Motor +DriverMiscellaneous

$145.00

Project Schedule

SPSB System Current Status

Questions

?