SOLAR POWERED SMART BLIND (SPSB) SYSTEM Smart Home Automation

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

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