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
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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
• PWM Signal read in by PIC18F252
• Futaba P2H TX Hardware modified to generate two
  discrete PWMs

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Remote Control

• Creates 1.2 ms 2.0 ms pulses via potentiometer
• 2 preset pulses to incorporate mode switch
• Self-Propelled Mode
• 1.2 ms
• Shaker Mode
• 2.0 ms

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Remote Control
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Future Redesign

• Current remote packaging not feasible
• Available equipment not suitable to miniaturize
  remote
• Redesign and/or repackage New 75Mhz TX/RX
• Advantages
• Portability
• Durability
• Functionality

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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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27MHz Filter Implementation
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27MHz Filter Test Results
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Location Tracking Block Diagram
27MHz Transmitter
PIC
Bandpass Filter
Transistor Amplifier
External ADC
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RF Signal Range Testing
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RF Amplifier

• Problem
• Voltage readings inadequate for dynamic range
  requirements
• Need 0V-3.3V Analog Input for Sufficient Dynamic
  Range

• Solution
• Design RF Amplifier with Gain gt 20 dB
• 8-bit Digital Interface with PIC18F252
  Microcontroller

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RF Amplifier Test Results
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RF Amplifier
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Location Tracking Block Diagram
27MHz Transmitter
PIC
Bandpass Filter
Transistor Amplifier
External ADC
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RF A-D 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 IC

• Analog Devices AD9283
• 8-bit Microcontroller Interface
• 100 Meg Samples/Second
• 0Vpp-1Vpp Analog input range

• Other Features
• 7.5 Effective Number Of Bits _at_ 27MHz
• Sufficient Dynamic Range
• 20 mA Digital Output Current Adequate for PIC
  Interfacing

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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
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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. Test Results
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System Power Analysis

• Radio Shack NiMH 3000mAh Battery

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Cost Analysis
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Transmitter Decoy
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Motor Box
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Mounted Motor and Servo
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The M.A.D.D. Mallard
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Questions?