ECE 4884: Senior Design Project Satya Bhan Andrew Ausley Michael Moseley 1
Logical Description Modules Wireless Sensors Lighting Stepper Cost Analysis Problems Testing & Demo 2
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 3
4 Wireless Hub Blinds Light Fixture Sensors
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6 ZigBee network model StandardBandwidthPower Consumption Wi-FiUp to 54 Mbps400+mA/20mA Bluetooth1Mbps40mA/0.2mA ZigBee250 kbps30mA/3µA
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9 Use low-cost, accurate LX1972 ambient light detector Produces output current vs. measured light
Modulated via a stepper motor interfaced with the tilt mechanism Current, minimum, and maximum tilt positions will be recorded 48 5VDC 10
Low-power, LED based lighting Automated dimming using a microcontroller Transformer-less power supply AC pulse width modulation 11 Triac signal and dimming – figure shows 52% dimming
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10,000 Units Components$146<$73 Labor$16,000$10 DepartmentsAvg. Cost/Year Assembly$100,000 Random Testing$10,000 10,000 Units Overall Cost$211 Retail$250 Profit Margin15.6% Money Back in 5 years!! 13 *all calculations provided by the given spreadsheet
ZigBee ◦ Central designs vs. distributed system ◦ ADC packet decoding Stepper motor ◦ Blind initialization ◦ Installation Lighting ◦ AC vs. DC package ◦ Commercial cost effective LEDs 14
15 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
16 The system will be implemented in the Aware Home on 10 th St. The flowchart simulation will be demonstrated as well as the measurement techniques for measuring the current
“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.,