Courtesy of the Intimidators.
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SETUP AND USAGE OF EE511 NEWSGROUP
DATA SHEETS
Updated 12-21-98
Students will be able to access Labs rooms: 552 AH, 591 AH and 581 AH as listed in the SCHEDULE FOR LABORATORY ACCESS. 552 AH is the EE499 lab so EE499 students have priority...please be courteous.
Students will build a square wave generator circuit which will send a finite number (i.e., burst) of modulated pulses to a bandpass filter. A diode detector is used to detect the pulses and a comparitor is used to convert them to binary information.
There are two stages to this system, the transmitter and receiver, respectively. Previous competitions have required the systems to operate from 10 feet to 160 feet (maximum length of hall way) so the received power vary from K/10^2 to K/160^2. The ratio of these is 16^2 = 256. Thus, it is recommended to test the dynamic range of the receiver for 1 to 256 units.
A. Build the transmitter so that it may be tested for output count, frequency and duty cycle. For testing the system performance, use a variable resistor that can vary the output voltage from 0.004 volts to 1 volt peak-to-peak. I suggest forming a voltage divider from say R1 = 256 R2 where R2 is a trim potentiometer. Ex: Let R2=1000 ohms, R1=256,000 ohms.
B. Build a receiver that will detect the transmitter's fundamental frequency. The input to the receiver will be tested, using the transmitter, between 0.004 volts p-p to 1 volt p-p. The output of the transmitter should be a binary value of on or off depending on the presence of the correct frequency pulse. Note that if your supply voltage were +/- 6 volts then the ac input would effectively be +/- 0.5 volts. The comparator range would be about 0 to 4.6 volts ( I subtracted 1.4 volts for 2 Vbe drops) so the gain would be 9.2 = 4.6/0.5 which would yield voltages at the input of the comparator between 0.036 = 9.2 x 0.004 to 4.6 = 9.2 x 0.5.
GROUPS for Project 1(first name is your group representative)
The objective of Project #3 is to build and test an optical communications link. The transmitter will transmit a square wave at the groups primary frequency f- and 10 additional measurements will be made uniformly between fc/10Hz and 10 x fcHz. A square wave generator may be used for this measurement. The receiver will receive this wave form and isolate it from ambient and overhead lighting interference. Project #2 does require demonstration of the Project 1 detector/digitization circuitry. There are two types of transmitters used, LED's and LASER DIODES. Each group will choose which transmitter to use for Project #2. The following is the required measurements for these different transducers.
1.a. LED transmitter BEAM PATTERN: No lens is used. The students will make measurements at their specific frequency only. Measurements are made NONUNIFORMLY from 90 degrees to -90 degrees where 0 degrees represents the maximum transmission direction. Typically, students rotate the transmitter on top of polar graph paper. More measurements are made in the region of the maximum beam response than in the sidelobe regions. When the beam pattern is graphed, the peak of the main lobe is scaled to a constant value and other values are plotted relative from this. The beam spread angle is the angle between values having 0.707 magnitude of the main lobe peak. Be sure to record the peak to peak voltage measurements made at each angle. Instructor must observe data but observation of the experiment is not necessary.
1.b. LASER transmitter BEAM PATTERN: The same procedure as with the LED is used but the beam pattern is measured for the receiver unit by rotating it with respect to the laser.
2. BOTH LASER and LED systems will be tested for their ability to detect and digitize the signal form project 2. Instructor must observe this.
GROUPS for Project 2(first name is your group representative)
Build a circuit to count and display 8 pulses, on both transmitter and receiver, generated in Projects 1 and 2. Project #3 will include the Project #1 and #2 circuitry. Count may be in binary or decimal format.
GROUPS for Project 3(first name is your group representative)
Maximum site distance is 329 feet.
LASER CATEGORY
LED CATEGORY
The 4th annual EE511 light gun contest was the most successful yet. This was due in part to the legacy of previous EE511 student efforts, but mostly to the hard work and long hours put into the projects by this year's students.
The group photos, members and final reports are linked below, followed by the various awards. The first set of awards are for the contest itself and others are for various aspects of the group projects.
Group 1: Photo link and final report.
Group 2: Intimidators, Photo link and final report.
Group 3: Photo link and final report.
Group 4: T9L, Photo link and final report.
Group 5: Photo link and final report.
Group 6: Photo link and final report.
Group 7: Photo link and final report.
Group 8: Photo link and final report.
Group 9: Photo link and final report.
Group 10: AAA, Photo link and final report.
Group 11: Photo link and final report.
AWARDS
MOST INNOVATIVE DESIGN
BEST CONSTRUCTION
BEST WEB SITES
CONTEST RESULTS
LED CATAGORY RANKING
FIRST PLACE: Group 11: Amir Hanif, and Beau Hackney.
SECOND PLACE: Group 8: Rachel Farmer, Angela Conley, Chris Kemper, Malinda Stremmel.
THIRD PLACE: Group 5: Gregg Moore, Ryan Porter, Brian McGuire, and Patrick Morrissy.
LONGEST DISTANCE DURING THE LED CONTEST
FIRST PLACE: Group 5: (128 feet) Gregg Moore, Ryan Porter, Brian McGuire, and Patrick Morrissy.
SECOND PLACE: Group 9: (111 feet) Tina Barnes, and Brian Taylor.
THIRD PLACE: Group 3: (56 feet) Emily Gentry, Chee Peng Yeap, Sheac Yee Lim, and Chow Chooi Wong .
LASER CATAGORY
FIRST PLACE: 3-way tie (320 feet)
SECOND PLACE: 2-way tie (320 feet)
THIRD PLACE:
The following is the actual playoff record and will only be available until next semester. There are two categories, LASER and LED, each contest having a second level elimination. It is interesting to note that the groups competing in the second level elimination sometimes equaled or outperformed, in distance, the first level groups. The second level contest gave these groups time to make corrections and improvements in their technique and technology. This was a highly competitive contest and all groups should be commended on their outstanding performance.
LED first level
Group 11 versus 3 ---> Group 11
Group 8 versus 9 -----> Group 8 versus 5 -----> Group 8 versus 11 ----> Group 11 (45')
Group 5 versus no one
LED second level
Group 3 versus 9 ----> Group 9 versus 5 -----> group 5 (128')
LASER first level
Group 1 versus 4 ---->
Group 6 versus 10 ---> Groups 4, 6 and 2 tie at maximum site distance. (320')
Group 2 versus 7 ---->
LASER second level
Group 1 versus 10 ---> Group 1 versus 7 ----> Groups 1 and 7 tie at max distance. (320')
