Transcript Document

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.
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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
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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