Automatic Light Control Device

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Automatic Light Control Device
Team leader John Thompson Team members
Marshalia Green Brad
Lowe Lutrisha
Johnson Faculty Advisor Dr. Robert Reese
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Abstract

• With the current electricity shortage, energy
  conservation has become a heavy consideration.
  Although it makes up 17 of all electricity
  consumed nationally, lighting is often overlooked
  as a potential source of conserving energy. The
  automatic light control device will use
  photoelectric beams to detect and keep track of
  the occupants of a room, keeping the lights on
  until the last person leaves. This system could
  potentially reduce light usage of a room by as
  much as 55.

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Typical Patterns of Occupancy
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Energy Consumption Comparisons
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Money Saving Potential

• For a room with 64 20-W fluorescent bulbs, 1.28kW
  of power is consumed hourly.
• Studies by the Department of Energy suggest that
  interior lights are needlessly on for an average
  of 6 hours per day.
• Using the ALCD would produce a yearly savings of
  140 (at 0.06 per kWh).

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Disadvantages of Current Light Control Systems

• Motion and audio sensors are susceptible to
  activation due to false signals, and they may
  turn off lights if occupant stays still or
  remains silent.
• False activation causes the lights to needlessly
  cycle, which consumes more power than if they
  were to stay on continuously.

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Design Diagram
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Design Requirements

• Power consumption
• System will operate at 120V 60 Hz AC

• Control unit will consume a negligible amount of
  power (lt 1.5W).

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Design Requirements

• Size
• Control unit must fit in a standard light switch
  socket (4.5 x 3.5 x 1.5)
• Installation
• Comparable to installing a light switch (can be
  done by anyone with basic knowledge of electrical
  wiring)
• Life expectancy
• Minimum life expectancy of 10 years

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Design Requirements

• Expandability/Adaptability to Environment
• Adaptable to incandescent or fluorescent lights
  via a toggle switch
• Able to manage up to 3 doorways
• Optional light sensor can prevent switch
  operation if light level is high enough from
  outside sources, such as a window
• Must comply with National Electric Code

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System Components
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Microcontroller

• Savage Innovations OOPic
• Operates on 6-15V DC
• Digital I/O Lines
• Analog-to-Digital Conversion
• Timers/counters
• EEPROM
• BASIC, Java, or C/C programmable

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Photoelectric Beams

• Omron Inofax--2806
• Retroreflective Sensor
• Range 2m / 6.6ft
• 10-30VDC or 24-240VAC

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Test Specifications
Requirements Circuit Simulation Software Simulation Performance Testing
Power consumption X X
Adaptability X X
Reliability X X X
Flexibility X X X
Microcontroller X X X
Photosensors X
Motion Sensor X
Voltage Transformer X X
AC/DC Converter X X
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The End