APLES Midterm Presentation February 24, 2008

The Team Blake Remy Team Leader Electrical Engineering -Power Control -RF Transmission -Circuit Design Joel Russell Computer Engineering -Microprocessor Programming -RF Transmission -Switching -Circuit Design Dale Alexander Electrical Engineering -Switching -Circuit Design -RF Transmission Matt Hodges Electrical Engineering -Power Control -Switching -Circuit Design -Microprocessor Programming

Overview Introduction –Problem –Solution Constraints Progress Design Approach Setbacks Timeline References Questions

Problem A majority of the energy consumed in lighting company parking lots is often wasted because there is no one in the lot to take advantage of the light being produced.

Solution A lighting system that is only used when light is needed by an employee.

Technical Constraints NameDescription RangesHand-held unit transmission range must be at least 200 ft. Minimum receive and transmit ranges for pole units must be 150 ft. User Recognition APLES must dim itself after there are no more users in range. Battery LifeThe battery life for the APLES hand-held must last at least 4 months. TransitioningAPLES must have two lighting levels: bright and dim. Pole Unit PowerThe pole unit must operate from 120 V source. Light TypeHigh Intensity Discharge (HID)

Practical Constraints Sustainability –Control Unit Durability –Key Fob Durability Manufacturability –Control Unit Size –Key Fob Size

Goals From SD1 Packetize data sent from transceivers Send a unique signal between key fob and pole units Build AC/DC Converter Build a third pole unit to more accurately test algorithm Calculate the system’s power consumption Measure light intensity for HID light at dim and bright state Construct PCB

Progress – Packetization The original scheme of sending data was removed Data is now packetized and transmitted after packetization timeout Reduced delay

Progress – Send Unique Signal A unique set of 8 bits will be transmitted from the key fob the pole unit receivers Eliminates system activation from random signals with the same band Re-implemented from SD1

Progress – AC/DC Converter

Progress – Third Pole Unit Third pole unit was built with an AC/DC converter Algorithm seemed to work for three units

Progress – Power Consumption Bright state current Dim state current

Progress – HID Intensity Measurements Dim state Bright state

Progress – PU PCB

Progress – Key Fob PCB

Design Approach Key Fob - Transmitter Pole Unit

Setbacks Malfunctioning transceiver and third pole unit Malfunctioning receivers Current readings produced unexpected values

Projected Timeline Layout Complete and Ordered – March 6 th Coding Complete – March 8 th PCBs Population Begins – April 1 st Final Testing Begins – April 4 th Final Design Presentation – April 23 rd

Semester Timeline MarchApril Coding Complete Layout complete & Ordered PCBs Populated Final Testing Final Design Review

HID Light Test High Voltage Lab Test with 60 W Light Video

References [1] “Question,” September 23, [Online.] Available:

Questions [1]