1. SOLAR POWERED SMART BLIND (SPSB) SYSTEM Smart Home Automation

2. SOLAR POWERED SMART BLIND
[11 March 2009]
Lai Li EE
Naing Oo EE
Kevin-Long Vo EE
Marco Herrera CompE
GEORGIA INSTITUTE OF TECHNOLOGY

3. SOLAR 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

4. SPSB 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

5. Operational View
Stepper Motor

6. User Interface / Control Box

7. Design Schematic Arduino MCU STEPPER MOTOR DRIVER STEPPER MOTOR
POWER MANAGEMENT
SOLAR PANELS
AC ADAPTER
BATTERY
PHOTO-RESISTORS
BUTTONS
TEMP
RTC
LCD DISPLAY

8. I2C Communication Only two I/O ports Bi-directional communication
Multiple slave devices

9. Light Detection Four photo-resistors Pull-down resistor network
Sensitivity
VOUT (0V – 5V)

10. Stepper Motor / Driver Four wire bi-polar motor
Current range (150mA - 750mA)
Power supply range from 7V to 30V.

11. Solar Cell NiCad Recharging Circuit
Power Management
Solar Cell NiCad Recharging Circuit

12. Algorithm Flow Chart DELAY START 5 MIN ADJUST RTC BLINDS ALGORITHM NO
READ SENSORS
ALGORITHM
DAY?
YES NO

13. Demonstration Plan
Recorded video demo: recording of SPSB throughout a day
Live demo: user input modes and the blinds let light in accordingly

14. Problems and Issues Electrical
Solar power might not be sufficient to power whole unit
Solution: AC-DC power adaptor
Mechanical
Stepper motor with driver might not provide enough torque
Solution: Servo motor with feedback

15. Budget and Cost Analysis
PROPOSAL
NOW
Blinds
$35 $5
Microcontroller
$32
Power Supply System
$60
$30
Sensors / RTC / LCD
$40
Stepper Motor / Driver
$25
$20
Miscellaneous
Design / Labor Cost
$46,700
MSRP
$300
$175

16. Current Expenditure
$145.00 16

17. Project Schedule Research & Ordering Parts  I2C Communications
TASKS
CURRENT STATUS
Research & Ordering Parts 
I2C Communications
Motor Control
Solar Circuit 
Blind Adjustment Algorithm
Finished Prototype
Parts research and ordering done
I2C communications done
Motor control
Solar circuit
Blind adjusting algorithm
Finished prototype

18. SPSB System Current Status

19. Questions ?