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BIRD ACCELEROMETER

VIEWS: 10 PAGES: 5

									Bird Accelerometer

         ECE 345
     Project Proposal
    September 15, 2003




                         Gregory Sorenson
                         Robert McKenzie
                                John Flink
BIRD ACCELEROMETER

Despite many advances in consumer electronics, wildlife tracking has not advanced
substantially in the past twenty years. To track a bird, one must still go stand in the
middle of the field in order to track the bird. Even then the bird can only be detected as a
direction. The biologist really has no idea if the bird is eating, sleeping, or flying.

The bird accelerometer will allow biologists to determine how birds fly in formation, and
what forces act on the bird while the bird is in flight. No accelerometer systems have
been previously built; an accelerometer would greatly help research efforts.


Objectives:
The goal is to build an accelerometer system that measures the in flight acceleration of a
bird and sends that information back to a field station. The unit will weigh about 50g and
be mounted on the bird. The system will measure acceleration in all three directions and
digitally send this data. The frequency for transmission will be 302 MHz a common
frequency band used by biologists. The unit will be battery powered and should last
about one month. In order to accomplish this, control circuitry is being developed that
will turn the transmitter off when the bird is not flying.

Benefits:
    Analyze bird’s flight trajectory.
    Low cost so many different birds can be analyzed.

Features:
    Measure acceleration along three axes.
    Weigh 50g
    Digitally transmits information in the 302 MHz band.
    Will stop transmitting when the bird is not in flight.
Design:
BLOCK DIAGRAM


      Bird Accelerometer and Antenna



                                                     Transmitter:
       Accelerometer           Control System         Amplifier
          System                                        and
                                                       Antenna




                               Power System




Accelerometers: There will be three accelerometers that will measure acceleration in each
of three directions. This block also includes a four to one multiplexer system that will
cycle the data from each accelerometer.

Control Logic Block: This block will control the transmitter. In order to save power, data
will only be transmitted if the bird is flying. The processor, most likely a PIC chip, will
determine when the bird is sleeping through analysis of the accelerometers. The
processor will also coordinate the flow of information to the transmitter and from the
accelerometers.

Transmitter Block: This will transmit the data to the ground. This is the component that
will draw the most power.

Power supply: The power supply provides energy to the rest of the circuit. A small
battery will be used. This will power all components.

Performance requirement:
     Transmits 5 miles.
     Sends the accelerometer data in an efficient easily decodable format.
     Unit lasts about one month before battery failure.
Testing procedures:

The accelerometers and microprocessor and antenna will be mounted on a breadboard to
ensure that data is successfully sent among the three units. Then a smaller unit will be
built and tests will be conducted by mounting the unit on a bicycle and then a kite. We
will measure transmission range and actual acceleration.
Acceleration versus time graphs will be generated as a test of the accelerometers. The
transmission and receivers will be moved apart until the signal can no longer be decoded
or we are more than eight miles away with successful transmission.

3.2 Tolerance analysis.

The most crucial part of this project is the transmitter. The transmitter must be able to
cleanly transmit the data so that it can be easily recovered even at a range of 5 miles.
Otherwise, the data will be useless to biologists as it will never make it off the bird.

4. Cost and Schedule
    1. Labor                              $25/hr*2.5hr*3*60hr=$11,250
    2. Components
           a. Battery                                           $10
           b. Accelerometers                              2*$40=$80
           c. Microprocessor                                    $3
           d. Transmitter                                       $20
           e. Circuit Board                                     $3

       Total components                                           $113

       Total cost                                                 $11,363
Week 1
Week 2
Week 3   Research…
         Transmitter, FSK                  Greg
         Solar cells, analog vs. digital   John
         Accelerometers, Processors        Bob
Week 4   Signal Analysis                   Greg
         Weight Budget                     John
         Power Budget                      Bob
         Proposal                          All
Week 5   Order components                  John
         Test Accelerometers               Bob
         Develop Software                  Greg
Week 6   Assemble components               All
         Design Review                     All
Week 7   Analyze accelerometers            All
         Reception testing                 All
         Debug                             All
Week 8   Analyze tests                     All
         Debug                             All
Week 9   Miniaturize                       All
Week
10       Bicycle test, kite test           All
Week
11       Mock demos                        All
         Analyze tests                     All
Week
12       Design modification and testing   All
Week
13       Write paper                       All
         Make PowerPoint slides            All
Week
14       Demos and Presentations           All

								
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