solar powered smart blind (spsb) system smart home automation
TRANSCRIPT
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
?