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TRANSCRIPT
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Preliminary Design ReviewCapstone Lab 2009
Steven Sorenson Anand Suchak John StrueberGreg Smith Kristen Aragon
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OverviewCore FunctionalitySystem BreakdownRisksContingency PlansPossible ExtensionsBudgetDivision of LaborScheduleQuestions
Anand
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We will be creating an interface for a G1 Android phone to allow for button-less control.The sensing device will track the user’s hand gestures to control basic phone functions.This would be useful in situations where you cannot easily access the phone i.e. skiing, snowboarding, running, etc.
Anand
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Song ControlPrevious/Next track Play/PauseVolume Up/Down
Wireless Control
Anand
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Greg
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Changes in the electric field sensed by an array of transmit and receive electrodes will be used to pinpoint the user’s hand in an x-y planeData stored in SRAM (no refresh cycles, data buses are directly accessible)Trilateration calculations on the collected data will be performed in firmware and compared with LUTs
Greg
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The signal received by the receive electrode will be an attenuated and phase shifted version of the transmitted signalAttenuation will increase as a conductive body (the user’s hand) is introduced into the fieldLevel of attenuation will be transformed into a magnitude that corresponds to the radius of a circle centered on the receiving electrodesIntersection of the 4 circles will denote x-y coordinates
Greg
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RxRx
Rx Rx
Tx
d2
d1
d3
d4
Greg
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Needs to control several things:
Interface sensorsInterpretation
Network devicesPossible song digestionPossible control signal transfer/digestion
Needs to have an A to D converter
Steven
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Speed: 20 MHzSRAM 128 BFlash: 2 KB10-bit A-D ConverterWatchdog Timer2-wire Serial Interface2 external 19 internal interrupts
Steven
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Features needed of the battery:Be light weight and small in sizeRetain charge for a long period of timeBe rechargeableHave a voltage of above 6 volts
Steven
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The battery that will use is a Polymer Lithium Ion BatterySpecifications:
Weight: 0.77ozDimensions: 0.23x1.32x1.86”3.7 V at 1100mAh
Will need two
Steven
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Serial Communication bus between microcontroller and Bluetooth modemTransmits media player control signals using AVRCP Bluetooth protocolOur Bluetooth will pair with the Bluetooth receiver embedded on the phone
John
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BlueSMiRF Gold ModemWorks for TX/RX from 9600 to 115200bps
SpecificationsPower Consumption: 25mAOperating Voltage:3.3V-6VFrequency: 2.4-2.524GHzSerial Communication:2400-115200bps
John
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Electromagnetic fields caused by surroundingsWeather/Shock ProofingInadequate resolution of sensing fields
John
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SensorsRevert to less complex sensing technique (accelerometer glove)
Bluetooth interference with sensing deviceMay have to go to USB
Interfacing with T-Mobile G1 Android
John
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Interface with smart phoneImplement new gestures for more controls such as receive callsGPS tracking and mappingMeans of controlling peripheral deviceGaming on Android
Kristen
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Component Product Quantity Cost
Microcontroller AVR ATTiny261 3 $7.50
PCBs 4 $132
Flash Memory (1Mb) $65
Bluetooth Modem BlueSMiRF Gold (WRL-00582) 1 $65
Android Phone T-Mobile G1 1 $200
Push Button 1 $2
Battery Lithium Ion Polymer Lithium Ion 2 $25
Housing Components
? $150
Miscellaneous Parts $200
Estimated total $1000
Calculated total ATM $839
Kristen
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Kristen
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Kristen
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CDRSensing component working
First MilestoneFull prototype
Second MilestonePrototype reworked to within size constraints
CapstoneCompletely working Project
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