SOLAR POWERED SMART BLIND (SPSB) SYSTEM Smart Home Automation

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

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

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

Operational View Stepper Motor

User Interface / Control Box

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.

Solar Cell NiCad Recharging Circuit Power Management Solar Cell NiCad Recharging Circuit

Algorithm Flow Chart DELAY START 5 MIN ADJUST RTC BLINDS ALGORITHM NO READ SENSORS ALGORITHM DAY? 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 unit Solution: AC-DC power adaptor Mechanical Stepper motor with driver might not provide enough torque Solution: Servo motor with feedback

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

Current Expenditure $145.00 16

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

SPSB System Current Status

Questions ?