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TEAM BOAR Michael Broski J o n a t h a n M u l va i n e Josh Schortgen P h i l l i p B ye r s ABSTRACT The objective of this project is to roast a complete hog (approximately 150 lbs) at a constant user-specified temperature until the internal temperature of the two thickest par ts of the meat reaches the desired user -specified temperature. When the hog reaches the second specified temperature, a user -configured timer will star t down, which upon completion will notify the user via remote that the meat is considered cooked and ready for consumption. The roaster must use propane as an energy source, regulate the ambient temperature in the tank, withstand hazardous outdoor conditions, and wirelessly transmit readouts to a remote display device that is sized to be comfor tably placed in the user s pocket or on the user’s keychain . ABSTRACT CONTINUED The block diagram below is the most up to date plan of action for interfacing with the base station. PSSC’S An ability to measure the 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 roaster by modifying gas flow using a PWM signal to operate a voltage controlled gas 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 . HARDWARE DESIGN The Microcontroller used (MC9S12H256VPVE) will be the main control of the base station for the hog r o a s t e r. Xbee Wireless – SCI LCD – SPI & PTT Digital Input – ~5 I/O Pins S e n s o r D a t a – AT D P r o p a n e F l o w Va l v e - P W M Tx and Rx of SCI to contr ol Xbe e 1 SPI Por t to dr ive the LCD Data Por t T will dr ive the LCD command pins Por t A will r e ad the state of the pushbuttons and RPG Por t AD will contr ol the se nsor input data fr om the te mpe r atur e se nsor s Por t B will be use d to contr ol the flow r ate valve and the automatic ignition BASE STATION Mock Up Xbee Wireless Module LPF with Gain Controller VALVE {…} PTA Tx Rx Rx Tx 160x128 LCD PTT PTB SPI Shift Register Microcontroller Ignite ~ 120VAC PTAD Amplification Circuit RTD MC9S12H256VPVE Power Supply 5V 3.3V BDM SECONDARY CIRCUITS The circuits here are used to provide a secondary translation to provide the microprocessor with more meaningful data it can use. This circuit is used to control the voltage-to-pressure valve used to regulate the gas flow from the propane tank. This circuit is a low pass filter with gain. It takes an input of ~100kHz PWM signal with a duty cycle between 50-100%. An increase of the duty cycle results in a decrease of the DC output due to the inverting op-amp This circuit will be used to amplify the output of the temperature sensors. Due to the fact that the temperature sensors only output around 100-300mV, the onboard ATD converter would not be able to accurately use the data. Therefore the output will first be amplified to provide a swing of at least 1-3V, allowing for greater accuracy. WIRELESS REMOTE Mock Up Xbee Wireless Module Tx Rx Rx Tx Buzzer PWM SPI Shift Register PTT PTAD MC9S12C32 16x2 LCD Vibrator {..} Pushbuttons