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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. 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

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  1. Easy on the Tini Cell phone detector Bill Barker Carey Davis Ben Irwin Travis Majors

  2. 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.

  3. 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

  4. Hardware Implementation Home Base RF Beacon RF Signal Detection IR Object Detection Microcontroller Data/ Programming interface Motor Controller Signal Disruption Motor Feedback Servo Motors

  5. Implementation of Subsystems

  6. The Robot • Metal platform from previous project • Two 9FGHD Ferrite Series ServoDisc Motors

  7. Robot Movement • Autonomous • Object Detection • Infra-Red • Home Base Detection • RF • Programmable Search Pattern • Signal Detection Sweep • Identify and approach appropriate signal

  8. Scenario #1 Signal Found

  9. Scenario#2 No Signal Found Signal Found Object Detected No Signal Found

  10. IR Object Detection • Sharp GP2D12 • Analog output voltage Vcc-.3V to .6V based on distance from object 0cm to 80cm

  11. The Motor • 9FGHD Ferrite Series ServoDisc Motor • Input voltage -12V to +12V • Capable of 1.5 N-m continuous torque

  12. 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

  13. Motor Encoders • Encoders such as the HEDS-5500 mounted on each motor

  14. Signal Detection

  15. 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

  16. 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

  17. Directional Capability Yagi VS Omni directional antennas

  18. 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.

  19. 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.

  20. 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

  21. Power Distribution

  22. Voltage Variations Driver motors, Lights, Speakers, Sensors, Circuitry, Display screen Voltage regulators or converters Recharging at “home” Power Distribution and Peripherals

  23. 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.

  24. Disruption Handling

  25. 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!

  26. Disruption Handling • Disruption of Call • LCD screen for message • Lights, sounds • Physically disrupt the call?

  27. Home Base

  28. 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

  29. Home Base • Recharge Station • RF “Beacon” • Data Sync

  30. 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.

  31. Home Base-Programming • Home Base will be used to reprogram different parameters of the robot such as: • Search Pattern • Search Time

  32. Risks/Contingencies

  33. 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.

  34. 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.

  35. Risk/Contingency #3 • Risk: Complexity of artificial intelligence and automation. • Object avoidance while tracking signal. • Contingency: Test in empty room to simplify coding.

  36. 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.

  37. Scheduling, Costs, and Labor

  38. Prelim Schedule

  39. 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

  40. Cost Estimations

  41. Thank you! ??Questions??

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