1. ECE 477 Design Review Team BOAR  Fall 2011 Paste a photo of team members here, annotated with names of team members. Left to Right:

2. Outline Project overviewProject overview Project-specific success criteriaProject-specific success criteria Block diagramBlock diagram Component selection rationaleComponent selection rationale Packaging designPackaging design Schematic and theory of operationSchematic and theory of operation PCB layoutPCB layout Software design/development statusSoftware design/development status Project completion timelineProject completion timeline Questions / discussionQuestions / discussion

3. Project Overview The BOAR is an automated hog roaster with an ability to set preferences at a base station, and then monitor the cooking process via a wireless informant without the user being present at the roaster. Temperature, remaining cook time, and system failure will all be part of the “indirect” nature of the monitoring device.The BOAR is an automated hog roaster with an ability to set preferences at a base station, and then monitor the cooking process via a wireless informant without the user being present at the roaster. Temperature, remaining cook time, and system failure will all be part of the “indirect” nature of the monitoring device.

4. Project-Specific Success Criteria An ability to measure internal temperature of two separate points in the meat and the temperature inside the roaster using RTD sensors. An ability to control the temperature inside the cooker by modifying gas flow using a clock signal to operate a stepper motor controlled needle valve. An ability to store and load cooking profiles from memory. An ability to automatically ignite and detect whether a flame is present. An ability to wirelessly communicate temperature information to a remote display device

5. Block Diagram MC9S12E256 POWER XBEE IGNITION LCD SOLENOID VALVE/MOTOR LTC2402 RTD THERMISTOR RPG BUTTONS IGNITE LOW HEAT GAS OFF HIGH HEAT MC9S08LL16 BASE STATION WIRELESS INFORMANT LCD BATTERY XBEE VIB. MOTOR BUZZER MAX710 BUTTONS SCROLL SELECT

6. Component Selection Rationale # Output ports# Output ports Multiple timersMultiple timers SPI / PWM / SCISPI / PWM / SCI 5V operation5V operation DA / AD convertersDA / AD converters High res. ADCHigh res. ADC Wireless com.Wireless com. CRITICAL FACTORS High frequencyHigh frequency Size of flashSize of flash Component sizeComponent size NON-CRITICAL FACTORS BASE STATION

7. Component Selection Rationale SPI / PWM / IIC / SCISPI / PWM / IIC / SCI Wireless com.Wireless com. Pwr. ConsumptionPwr. Consumption 3.3V3.3V Component sizeComponent size Long battery lifeLong battery life Low voltage modeLow voltage mode User alertsUser alerts CRITICAL FACTORS High frequencyHigh frequency # output ports# output ports Com. SpeedCom. Speed NON-CRITICAL FACTORS WIRELESS INFORMANT

8. Packaging Design Base station

9. Packaging Design Base station (Folded sheet metal enclosure)

10. Schematic/Theory of Operation Base station Online uncompressed view

11. Schematic/Theory of Operation Base station (left) BDM Reset

12. Schematic/Theory of Operation Base station (bottom) Oscillator Decoupling network

13. Schematic/Theory of Operation Base station Power Block 6.3VAC Secondary step down (from 120VAC) 5V Low Dropout Regulator Specific 5VDC to 3.3VDC converter (LM3940) Rectification/ filtering Power loss safety measures

14. Schematic/Theory of Operation Base station Thermal Sensing Bias network for each RTD Bias network controls range 24 bit ATD conversion SPI communication to Microprocessor with slave select 5V supply Low pass filter to eliminate HF

15. Schematic/Theory of Operation Base station Wireless communication SCI interface 3.3V supply Wide range of communication speeds 100 m line of sight communication 2 way transmission

16. Schematic/Theory of Operation Safety Shut-off Valve Normally closed ON-OFF solenoid valve used for safety 120VAC coil voltage Controlled by relay Valve will close and stop flow of propane if loss of power

17. Schematic/Theory of Operation Base station Microcontroller (MC9S12E256) SPI com. to ATD chips LT2402 SCI to XBEE BDM connector Reset circuit Decoupling capacitors Resonator Control of roaster and informant Profile storage in flash ATD monitored thermistor

18. Schematic/Theory of Operation Informant Online uncompressed view

19. Schematic/Theory of Operation Informant BDM Decoupling network (Internal Oscillator)

20. Schematic/Theory of Operation Informant Power block Battery powered MAX710 wide input range Selectable 3.3V operation

21. Schematic/Theory of Operation Informant Wireless Communication SCI interface 3.3V supply Wide range of communication speeds 100 m line of sight communication 2 way transmission

22. Schematic/Theory of Operation Informant General I/O user interface Double power MOSFET User alerts audio / oscillation I/O pin operated

23. PCB Layout Base station

24. PCB Layout Base station

25. PCB Layout Base station

26. PCB Layout Base station

27. PCB Layout Informant

28. Software Design/Development Status LCD primitives writtenLCD primitives written Interrupt driven sensor pollingInterrupt driven sensor polling Burst communicationsBurst communications Pushbutton ignition sequencePushbutton ignition sequence Cooking profiles / outcomesCooking profiles / outcomes Pulse driven valve controlPulse driven valve control

29. Software Design/Development Status TO DOTO DO –Skeleton files –Writing flash –Saved file formats –XBEE operation –Valve algorithm –Safety routines –Ignition routines –Sensor polling

30. Project Completion Timeline Final PCB adjustments Mar 7Final PCB adjustments Mar 7 PCB design complete (locked) March 9PCB design complete (locked) March 9 Minor software routines written Mar 23Minor software routines written Mar 23 PCB assembly / testing Mar 30PCB assembly / testing Mar 30 Major software routines written Apr 13Major software routines written Apr 13 Physical assembly Apr 13Physical assembly Apr 13

31. Questions / Discussion Safety