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ECE 477 Design Review Team 07  Fall 2007

ECE 477 Design Review Team 07  Fall 2007. Outline. Project overview Project-specific success criteria Block diagram Component selection rationale Packaging design Schematic and theory of operation PCB layout Software design/development status Project completion timeline

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ECE 477 Design Review Team 07  Fall 2007

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  1. ECE 477 Design Review Team 07  Fall 2007

  2. Outline • Project overview • Project-specific success criteria • Block diagram • Component selection rationale • Packaging design • Schematic and theory of operation • PCB layout • Software design/development status • Project completion timeline • Questions / discussion

  3. Project Overview • Hand held TV remote - Can “learn” IR signals from existing remotes and recreate these signals • LCD display on device - Capable of receiving a composite video stream at 2.4GHz and display it on the screen • Touchscreen interface - Can take touch input on screen to change channel on device and change channel on TV

  4. Project Overview • Runs on rechargeable batteries The device runs on rechargeable batteries and has a built-in charging interface to charge the batteries from a wall wart input • 2.4 GHz video receiver Receives composite video from a 2.4GHz transmitter. This transmitter is connected to an external TV box with remote capabilities.

  5. Project-Specific Success Criteria • PSSC #1 An ability to decode a Composite video signal (transmitted via a 2.4 GHz wireless link) and display it on an LCD touchscreen. • PSSC #2 An ability to input user commands from an LCD touchscreen.

  6. Project-Specific Success Criteria • PSSC #3 An ability to program (“learn”) the IR modulation scheme used by the user’s television set and “cable box”. • PSSC #4 An ability to transmit IR commands (separately) to a television receiver and to a “cable box”.

  7. Project-Specific Success Criteria • PSSC #5 An ability to intelligently recharge the remote’s battery and monitor its status (e.g., display a battery fuel gauge).

  8. Block Diagram

  9. Component Selection Rationale • Microcontroller – PIC24 Series by Microchip • Processing power: 80 Mhz • On-chip peripherals: SCI, SPI, TIM, ATD, PWM • Cost: $10.70 • Low power consumption

  10. Component Selection Rationale • LCD Module – MTF-T035DHSLP-A by Microtips • Size and resolution: 3.5” diagonally, 320x240 at 18 bit, 30 fps • Integrated touch panel • Digital input: TFT interface • Cost: $47

  11. Component Selection Rationale • Touch Screen Controller – ADS7843 by TI • Serial Interface • Low power consumption: • 750μW at a 125kHz throughput rate and a 2.7V supply • Under 0.5μW during shutdown mode • Energy Conservation: • Accurate output on first conversion cycle • Pen Interrupt Request Feature.

  12. Component Selection Rationale • Wireless Receiver – AWM634RX by Airwave • Compatibility with NTSC video format • Low power consumption • Operation Frequency Range of 2400 ~ 2483MHz • Cost: $27 • Works ideally with sister transmitter (AWM630TX) with cost of $16

  13. Component Selection Rationale • Battery Charger – DS2715 by Dallas Semiconductor • Can charge battery packs with anywhere between 1 and 10 batteries • Works with NiMH batteries • Allows use of batteries during charge • Battery Monitor – DS2438 by Dallas Semiconductor • Simple three pin interface (Positive Lead, Negative Lead and MicroC interface) • Works for NiMH batteries • Designed for battery packs between 2 and 6 batteries

  14. Packaging Design • Packaging Considerations: • AA Batteries • 2.01” Length • 0.56” Diameter • 6 Batteries Total (2 Columns, 3 Rows) • LCD Screen • 3.5” Diagonal • IR LEDs • 3 push buttons for power • Handheld

  15. Packaging Design

  16. Schematic/Theory of Operation

  17. Schematic/Theory of Operation

  18. Schematic/Theory of Operation

  19. Schematic/Theory of Operation

  20. Schematic/Theory of Operation

  21. Schematic/Theory of Operation

  22. Schematic/Theory of Operation

  23. Schematic/Theory of Operation

  24. PCB Layout - Considerations • Placing the power management portion of the PCB at the lower end to allow easy access to the battery pack • Separate the analog (2.4GHz receiver and ADC) portion from the digital (LCD, Touch controller, Microcontroller) portion • Place Receiver on the top left of the device to minimize noise picked up by the antenna • Place oscillator as close to the ADC as possible • Place bypass capacitors as close to IC’s as possible • Avoiding 90deg traces (using 135deg traces) • Separate grounds for analog and digital circuits

  25. PCB Layout – Component Placement

  26. PCB Layout – Bypass Cap for MicroC

  27. PCB Layout – ADC Oscillator Placement

  28. PCB Layout – Charger Circuit

  29. PCB Layout – Plan of Action • Complete routing (possibly un/reroute) to better optimize traces • Add mounting holes to the edges of the board • Add RS-232 port for programming MicroC • Add level translation for RS-232 • Add socket for wall wart input at an edge • Antenna being wired to header on board

  30. Software Design/Development Status

  31. Software Design/Development Status

  32. Software Design/Development Status

  33. Project Completion Timeline

  34. Questions / Discussion

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