ece 4884: senior design project satya bhan andrew ausley michael moseley 1
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ECE 4884: Senior Design Project
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Automated light balancing via remote blinds and dimmers
Centralized, low-power wireless network Low bandwidth information feed via
remote sensor network LED-based light fixture
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ZigBee network model
Standard Bandwidth Power Consumption
Wi-Fi Up to 54 Mbps 400+mA/20mA
Bluetooth 1Mbps 40mA/0.2mA
ZigBee 250 kbps 30mA/3µA
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Use low-cost, accurate LX1972 ambient light detector
Produces output current vs. measured light
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Modulated via a stepper motor interfaced with the tilt mechanism
Current, minimum, and maximum tilt positions will be recorded
48 steps/rev. @ 5VDC
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Low-power, LED based lighting Automated dimming using a microcontroller Transformer-less power supply AC pulse width modulation
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Triac signal and dimming – figure shows 52% dimming
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Type Prototype 1unit @ 10,000 Units
Components $146 <$73
Labor $16,000 $10Departments Avg.
Cost/Year
Assembly $100,000
Random Testing $10,000
1unit @ 10,000 Units
Overall Cost $211
Retail $250
Profit Margin
15.6%
Money Back in 5 years!!Money Back in 5 years!!
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*all calculations provided by the given spreadsheet
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ZigBee◦ Central designs vs. distributed system◦ ADC packet decoding
Stepper motor◦ Blind initialization◦ Installation
Lighting◦ AC vs. DC package ◦ Commercial cost effective LEDs
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Cover sensors Simulate flowchart Allow the system to run for an extended
period of time > 1 day Tested by measuring the current flowing to
the light fixture vs. that of an incandescent light bulb
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The system will be implemented in the Aware Home on 10th St.
The flowchart simulation will be demonstrated as well as the measurement techniques for measuring the current
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“I recognize the right and duty of this generation to develop and use our natural resources, but I do not recognize the right to waste them, or to rob by wasteful use, the generations that come after us.”
- Theodore Roosevelt, speech, Washington, D.C., 1900
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