The M.A.D.D. Mallard

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The M.A.D.D. Mallard

• Final Presentation
• Blind Decoy, Inc.

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Design Team
Bledar Andoni Leader
Chadrick Mason EE
Channing Hodges EE
Trent Lee EE
Dr. John P. Donohoe, P.E. Project Advisor
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Design Constraints
Design Constraint Prototype Result PCB Result
Remote Control System FCC-Compliant 75MHz 75 MHz 75 MHz
Location Tracking System FCC-Compliant 27MHz 27 MHz 27 MHz
Autonomous Operation No User Interaction a a
Battery Life 4-6 Hours per charge a a
System Power 3.3V, 5V, 12V Supply Rails 5V 12V 3.3V 12V
Packaging Limited Decoy Space N/A a
Range 20 foot operating range a X
Shaking Ability Dedicated Shaker Mode a a
Durability/Reliability Withstand Normal Conditions N/A a
Cost MSRP 225 95 110
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Hardware Block Diagram
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Remote Control Interfacing

• Remote control operates _at_ 75 MHz
• Outputs Variable PWM Signal
• 1.2 ms ? ? 2.0 ms
• Futaba P2H TX hardware modified to generate two
  discrete PWMs
• 1.2 ms Self-Propelled Mode
• 2.0 ms Shaker Mode
• Remote not needed Defaults to Self-Propelled
  Mode

PWM Out Result
None Self-Propelled
1.2 ms Self-Propelled
2.0 ms Shaker Mode
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Remote Control
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Location Tracking Block Diagram
27MHz Transmitter
PIC
Bandpass Filter
Transistor Amplifier
External ADC
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27MHz Filter Design
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Location Tracking Block Diagram
27MHz Transmitter
PIC
Bandpass Filter
Transistor Amplifier
External ADC
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RF Amplifier Redesign

• Problem
• Voltage readings inadequate
• Need 0 512 mV Analog Input for Sufficient
  Dynamic Range
• Solution
• Design RF Amplifier with Gain gt 20 dB
• Use Cascode Topology

Range (ft.) Voltage Level (mV)
2.5 90
5.0 76
7.5 63
10.0 53
12.5 41
15.0 32
17.5 19
20.0 10
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RF Amplifier Test Results
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Location Tracking Block Diagram
27MHz Transmitter
PIC
Bandpass Filter
Transistor Amplifier
External ADC
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RF Analog-Digital Conversion

• Problem
• PIC Microcontroller cannot sample 27MHz signal
• RF Signal ? 37 ns Period
• Minimum Required Acquisition Time for PIC ADC ?
  12.86 us
• 12.86 us gtgt 37 ns

• Solution
• External ADC
• Sample Rate gt 100 Mega Samples/sec
• 8-bit Binary Offset Output to give sufficient
  dynamic range

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External ADC

• Analog Devices AD9283
• 8-bit Microcontroller Interface
• 100 Meg Samples/Second
• 512 mV Analog input range

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Location Tracking Block Diagram
27MHz Transmitter
PIC
Bandpass Filter
Transistor Amplifier
External ADC
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Software Block Diagram
User Input
AD9283
PORTB
Mode Selection
PWM Sampler
Timers
C.R.O.S.S.
PIC18F252
Motor Control
PWM Generator
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Rudder Control
PWM Output Decoy Response
1.2 ms Left Turn
1.6 ms Straight
2.0 ms Right Turn
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C.R.O.S.S. Module
C.R.O.S.S. will perform the necessary propulsion
methods in order to maintain the twenty foot
operating radius by monitoring strength of
location signal
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C.R.O.S.S. Testing
Location Signal Strength System Action
100 mV Maintain Current Mode
50 mV Maintain Current Mode
10 mV Enter C.R.O.S.S.
5 mV Continue C.R.O.S.S.
15 mV Exit C.R.O.S.S.
Return to Previous Mode
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System Power Analysis
Component Current Drain
Futaba FP-R122JE 5 mA
Elsema FM-212T 45 mA
DC Motors 500 mA
Miscellaneous Drains 40 mA
Futaba Rudder Servo 10 mA
PIC18F252 10 mA
Average Total Drain 610 mA

• Radio Shack NiMH 3000mAh Battery

Life Expectancy 3000 / 610 4.9 hours
Actual Drain Actual Drain 650 mA
Actual Battery Life 3000 / 650 4.5 hours
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Cost Analysis
Component Unit Cost (1k qty.)
27MHz Transmitter 20
27MHz Receiver 20
75MHz TX/RX 25
7.2V 3000mAh Battery 15
PIC18F252 Microcontroller 5
DC Propeller Motor 1
DC Shaker Motor 1
Futaba Rudder Servo 1
MAX761 12V Voltage Regulator 2
PCB Cost 10
Discrete Components 10
Total Parts Cost 110
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Transmitter Decoy
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Mechanical Decoy
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The M.A.D.D. Mallard
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Self-Propelled Mode
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Shaker Mode
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Durability/Reliability
Packaging Requirement Test Results
a Operating Temperature 35 F - 100 F
a Environmental Interaction/Interference Collide Continue
a Buoyancy Positive
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Current Problem

• Signal Detection

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Future Improvements

• Design compact remote control
• Advantages
• Portability
• Durability
• Functionality
• Reduce weight by using lighter materials

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Acknowledgements

• Dr. John Donohoe
• Dr. Joseph Picone
• Dr. Raymond Winton
• Dr. Robert Reese
• Diversified Technology, Inc.
• ECE Department

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Questions?