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ECE 477 Design Review Team 13  Spring 2008

ECE 477 Design Review Team 13  Spring 2008. Paste a photo of team members here, annotated with names of team members. Srichand Varun Madhu Anvesh. Outline. Project overview Project-specific success criteria Block diagram Component selection rationale

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ECE 477 Design Review Team 13  Spring 2008

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  1. ECE 477 Design Review Team 13  Spring 2008 Paste a photo of team members here, annotated with names of team members. Srichand Varun Madhu Anvesh

  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 • An ordering system will be created where the user will be able to order and pay for the food from the comfort of the table • Consists of a touch screen monitor which displays the restaurant menu and allows the user to select the items • The order is sent through a wireless interface which is received by the receiver • The bill can be paid at the table using a RFID gift card after it is validated

  4. Project-Specific Success Criteria • An ability to display information (menus, items ordered, etc.) on an LCD. • An ability to enter choices and select functions via touch screen entry. • An ability to read an RFID card and use decoded user ID to look up personal account information. • An ability to transmit menu choices over a wireless interface (e.g., 802.15.4) • An ability to customize the menu by getting data from database.

  5. Block Diagram 12 VDC Supply LCD Screen (NEC 8.4”) Touch Screen Panel 4 2 Graphics Controller (Reach Technologies 42-0105-01) Voltage Regulator and DC-DC Converters (5V to 3.3V) 2 SCI 2 GPIO 2 SCI 3 GPIO Microcontroller (Freescale MC9S12C128) ZigBee Transceiver (Maxstream XBee Pro) 1 SCI RFID Reader (Spark Fun ID – 12)

  6. Component Selection Rationale Wireless Transceiver • Chosen component : Max stream XBee Pro • 1 SCI interface • Medium Range (300m Indoor) • Low power dissipation • Built in Antenna • Competing Alternative : Atmel ATmega64RZAPV

  7. Component Selection Rationale RFID Reader • Chosen component : Spark Fun ID-12 RFID Reader • 1 SCI Interface • Short Range (12 cm) • Low Cost • Built in Antenna • Competing Alternative : Texas Instruments RI-STU-MRD1

  8. Component Selection Rationale LCD and Touch Screen • Chosen component : Reach Technologies 42-0105-01 LCD Touch Screen Kit • Medium size (8.4” diagonally) • External SD memory • SCI Interface • Competing Alternative : Apollo Display Technologies T-51638D084J-FW-A-AB-V399B Touch screen LCD

  9. Component Selection Rationale Microcontroller • Chosen component : MC9S12E128 • 3 SCI Ports • 80 pin packaging • 25 MHz clock • Previously known microcontroller family and development environment • Competing Alternative : PIC dsPIC33FJ128MC706

  10. Packaging Design • Constraints • Size and Durability • Portability • Heat Dissipation • Cost

  11. Packaging Design • Dimensions • 226mm x 157mm x 47mm • Material • Non conducting material • Screen Size • 8.4 inch diagonally

  12. Packaging Design

  13. Packaging Design Chosen Enclosure : PACTEC PT-10 External Dimensions: 7.9 x 11 x 3 in

  14. Schematic (Microcontroller)

  15. Schematic (Clock Generator) • Colpitts Oscillator setting • Manufacturer’s specifications for capacitor and resistor values • 8 MHz Crystal

  16. Schematic (ZigBee Wireless) • DIN and DOUT are connected to the SCI • RTS, CTS, Sleep and Reset are connected to the GPIOs

  17. Schematic (Power Circuit) • Non-synchronous step down voltage regulator • For both 3.3 V and 5 V • Very high efficiency (up to 87%)

  18. Schematic (Headers) • Headers for RFID and Graphic Controller • Pull-up resistors for RTS and TX of Graphic Controller • By-pass capacitor for the RFID header

  19. PCB Layout • Maximum Dimensions: 7.4 x 10.5 x 3 in • 0807 SMD resistors and capacitors • 2 Power supplies: 3.3 V and 5 V • Maximum Current Draw: 300 mA • Nets routed by priority • Status: All components placed 90 % routed

  20. PCB Layout Top Layer • 12 V – 60 mils • 5 V – 60 mils • 3.3 V – 30 mils • Others – 12 mils

  21. PCB Layout Bottom Layer • GND – 60 mils • Others – 12 mils

  22. PCB Layout Microcontroller

  23. PCB Layout Wireless Transceiver

  24. PCB Layout Power Supply Top • All power supply kept together • 12 V input header placed between the two circuits

  25. PCB Layout Power Supply Bottom • GND header placed between the two circuits

  26. PCB Layout Oscillator Circuit Top • Colpitts Oscillator circuit • 8 MHz crystal oscillator

  27. PCB Layout Oscillator Circuit Bottom

  28. PCB Layout RFID Header • RX SCI pin • 5 V and GND • RESET tied to +5 V

  29. PCB Layout Graphic Controller Header • GPIOs for RTS, Reset and GND using 10k pull up • TX using 10k pull up • GND

  30. Software Design • Software is written in C using code warrior • Timer interrupt used to create system clock • All operations are contained in main loop • RFID and Touch screen works on interrupt mode

  31. Software Design • Sequence of Operation • Sleep mode • Interrupt on touch screen/RFID • Display Menu • Send order • Confirmation • Pay Bill • Sleep mode

  32. Software Design • Completed Interfaces : • Tested RFID interface with 9S12C32 • System Clock • Tasks to complete next : • XBee Interface • Graphical Interface • Software code for customizing and Displaying menu

  33. Project Completion Timeline

  34. Questions / Discussion

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