Download - Super Team 12
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SuperTeam 12
Brett Dunscomb David HowdenKevin Bedrossian Chris Clary
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NEED
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• Develop a simple application that utilizes a sensor and a microcontroller
• Take a user input from sensor to generate visual stimulus
• Custom 8 ball messages• Fun to build!
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Motivation
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• Take a 50 year old toy and modernize it. • In an era where kids have tablets and
cell phones in kindergarten, their toys should share similar excitement.
• Keep it recognizable to those that grow up with the original toy.
• An upgraded version of the current toy
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Objective
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Design a prototype for a digital version of the popular children’s toy “Magic 8 Ball” originally conceived by Mattel and improve upon it.
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Alternatives
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• Current Magic 8 ball uses a plastic icosahedral (20 sided) die to display one of twenty possible messages
• Stuck with the same boring messages• Custom 8 balls cost $2000 for mold http
://www.ginifab.com/gift/custom_magic_8_ball.html
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Requirements
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Acknowledge shaking motion to deploy message
Have at least as many messages as are in the original toy
Low power consumption Insure product is easy to use
for all ages
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Our Approach
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• Use accelerometer to acknowledge user input (shaking motion)
• Display random messages on LCD screen
• Use familiar “Magic 8 Ball” casing to house system
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State Diagram
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Display Mode
Switch mode
Sleep
Pick Message
Display Message
Time delay expiredDouble tap interrupt
Message chosen
Mode selected
Time delay expiredFree fall interrupt
Wait for interrupt
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Design
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Motion MessageMicrocontroller DisplayAccelerometer
Power
SPIInterrupts
I2C
DC Voltage 3.3
9 Volt battery
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• 3-axis measurement• Two configurable interrupt pins• Multiple low power modes• Capable of threshold detection
while in sleep mode• Vin of 3.3V with 3.3V logic
Accelerometer
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Analog Devices ADXL345 Breakout from Adafruit
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Accelerometer
Implementation• I2C bus
communication• Threshold activity
interrupt• Low power state
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Atmega 328p• 8 bit processor• 8 MHz clock• 32K of flash memory• 2K of Ram• TQFP package 32 pins• Inexpensive
Microcontroller
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Display
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Nokia 5110/3310 monochrome LCD from Adafruit
• 84 x 48 pixel count• Backlit• Runs off 3.3 volt• Uses a SPI bus
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Display
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Implementation:• Display all 20 original 8 ball messages• Readable in dark rooms• Displays Bitmaps
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Power
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Implementation• 9V battery supply• LM 317 voltage regulator
steps down to 3.3V• Low power mode draws
5mA down from 30mA when displaying a message
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Implementation
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Implementation
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IP and Prior Work
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• Atmel TWI_MASTER Library• Adafruit Library• Sparkfun Libray• Display code http://pastie.org/1332371• Mattel for the 8 ball shell and idea
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Testing
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BREAD BOARD TESTS• Tested power circuit output• Tested random message display• Tested accelerometer output levels
IMPLEMENTATION TESTS• Tested power to components• Tested sleep mode• Tested shake response
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Results
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• Initially tried powering the 8 ball with a shake generator but was unable to make it work
• 9V battery with single regulator was able to power all components
• System goes into sleep mode shortly after message is displayed
• System wakes up when shaken• Display was clear and easy to read
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Costs
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• Nokia 5110/3310 LCD $ 10.00• ADXL345 Accelerometer $ 19.95• Atmega 328p $ 2.50• Header pins $ 1.25• Board $ 8.00• 8 Ball housing $ 8.00• Resistors, caps, etc $ 7.00• 9V battery $ 2.50
$ 59.20
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Lessons Learned
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• Proper time management is important• Setting documentation standards early
and following them throughout is necessary
• Proper communication is key• Have all the surface mount components
ready to go at once, don’t try adding one later
• With access to reflow oven, the breakout board was an unnecessary cost
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Contributions
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• Brett Dunscomb: display coding, breadboard testing, and microcontroller pin assignment for display
• Chris Clary: schematic design, passive component setup, and board layout
• David Howden: power system design, power system test and board layout
• Kevin Bedrossian: accelerometer coding, breadboard testing, and microcontroller pin assignment for accelerometer
• Group: documentation, final construction, component research, and implementation testing