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Easy on the Tini. Cell phone detector. Bill Barker Carey Davis Ben Irwin Travis Majors. Description and Goals. To create a robot that detects RF signals (cell phone signals) then moves toward the strongest signal. Notifies cell phone user about use in that area. Outline of Approach.

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easy on the tini

Easy on the Tini

Cell phone detector

Bill Barker

Carey Davis

Ben Irwin

Travis Majors

description and goals
Description and Goals
  • To create a robot that detects RF signals (cell phone signals) then moves toward the strongest signal.
  • Notifies cell phone user about use in that area.
outline of approach
Outline of Approach
  • Create a robot with two servo motors
  • Fashion RF detecting antenna(s) on the robot chassis
  • Mount IR sensors to aid robot movement
  • Use display, lighting, sounds, etc. to deter cell phone use
  • Design a microcontroller to interface the systems
hardware implementation
Hardware Implementation

Home Base

RF Beacon

RF Signal

Detection

IR Object

Detection

Microcontroller

Data/ Programming

interface

Motor

Controller

Signal

Disruption

Motor

Feedback

Servo

Motors

the robot
The Robot
  • Metal platform from previous project
  • Two 9FGHD Ferrite Series ServoDisc Motors
robot movement
Robot Movement
  • Autonomous
    • Object Detection
      • Infra-Red
    • Home Base Detection
      • RF
  • Programmable Search Pattern
    • Signal Detection Sweep
  • Identify and approach appropriate signal
slide8

Scenario #1

Signal Found

slide9

Scenario#2

No Signal Found

Signal Found

Object Detected

No Signal Found

ir object detection
IR Object Detection
  • Sharp GP2D12
  • Analog output voltage

Vcc-.3V to .6V based on

distance from object

0cm to 80cm

the motor
The Motor
  • 9FGHD Ferrite Series ServoDisc Motor
  • Input voltage -12V to +12V
  • Capable of 1.5 N-m continuous torque
motor drivers
Motor Drivers
  • Microcontroller delivers signal voltage to drivers using PWM
  • Driver performs DC/DC conversion to step up input signal voltage to -12V to +12V output motor voltage
motor encoders
Motor Encoders
  • Encoders such as the

HEDS-5500 mounted

on each motor

robot signal detection
Robot Signal Detection
  • Overview: This part of the robot will detect signals within the GSM frequency-band that will then be translated into data that will control the robots movement in pursuit of a detected strong signal. This will be done by the following devices:
    • Tuned directional antennas
    • RF signal intensity meter
    • Voltage processing component
tuned directional antennas
Tuned Directional Antennas
  • This component will give directional ordination to the robot to pursue the signal.
    • A Yagi antenna will be used to hone in on the signal.
      • Antennas Specifications:

GSM: Uplink 890-915MHz and Downlink 935-960Mhz

PCS band: 1.7-1.99 GHz

directional capability
Directional Capability

Yagi VS Omni directional antennas

rf signal intensity meter
RF Signal Intensity Meter
  • This simplified circuit will take the antenna’s RF signal as an input and will output a voltage that is proportional to the signal’s intensity.
voltage processing component
Voltage Processing Component
  • Feed measured voltage into the micro-controller’s A/D converter.
  • Have the microcontroller only sample at what is realistic to match the motor’s encoder data.
  • Store both RF intensity and robot direction data for a full revolution in on-board RAM.
  • Find peak voltage within data and have robot return to this recorded direction.
microcontroller
Microcontroller
  • Prototype Board for MSP430-F1611
    • Multiple A/D converters
    • Expanded RAM to 10K bytes for greater storage capacity
    • PWM capabilities for motor control
    • Good tools and easy debugging
    • Cost effective solution of our application
power distribution and peripherals
Voltage Variations

Driver motors, Lights, Speakers, Sensors, Circuitry, Display screen

Voltage regulators or converters

Recharging at “home”

Power Distribution and Peripherals
power distribution and peripherals battery
Power Distribution and Peripherals-Battery
  • 2 BP7-12 12 V 7Ah Batteries to power the robot
  • 5.94” x 2.56” x 3.98”
  • 6 lbs.
disruption handling
Disruption Handling
  • Robot Modes
    • Hospital Mode
      • Robot looks for over any amount of time, suggesting a data transmission
      • Turn off your cell phone!
    • Silent Mode
      • Robot looks for signal lasting for awhile, suggesting a call vs. a text message
      • Quiet your phone!
disruption handling1
Disruption Handling
  • Disruption of Call
    • LCD screen for message
    • Lights, sounds
    • Physically disrupt the call?
home base
Home Base
  • Robot will be able to autonomously return to a given “home base” for a variety of reasons:
    • Battery charge level
    • Set time period
    • Called back by us
home base1
Home Base
  • Recharge Station
  • RF “Beacon”
  • Data Sync
home base rf beacon
Home Base –RF “Beacon”
  • To call the robot home a signal within the robots detection bandwidth will be emitted.
    • Constant frequency within range of detection device
    • Higher power to override cell phone signals.
  • Same intelligence used to follow cell phone signals will be used find the home base.
home base programming
Home Base-Programming
  • Home Base will be used to reprogram different parameters of the robot such as:
    • Search Pattern
    • Search Time
risk contingency 1
Risk/Contingency #1
  • Risk: It might be impossible to legally physically disrupt the cell phone signal.
  • Contingency: Robot will ask user to turn off phone via basic display/sounds.
risk contingency 2
Risk/Contingency #2
  • Risk: Difficulty to differentiate between cell phone signals and other RF signals.
  • Contingency: Setup closed environment with little outside interference and use a strong set signal to test tracking ability.
risk contingency 3
Risk/Contingency #3
  • Risk: Complexity of artificial intelligence and automation.
    • Object avoidance while tracking signal.
  • Contingency: Test in empty room to simplify coding.
risk contingency 4
Risk/Contingency #4
  • Risk: In areas that RF transmissions are not allowed, our home beacon will not suffice.
  • Contingency: Program return path or remember path traveled in order to return home.
milestones
Milestones
  • Milestone 1:Robot moves towards test signal
  • Milestone 2:Programmable search parameters, IR object detection integration, home base construction complete
  • Expo:Robot and home base fully functional
thank you

Thank you!

??Questions??