Slide 1Now Presenting…Project OverviewDesignBlock DiagramGuitarPCB DesignSlide 8MicrocontrollerDSP ChipFilteringMotor DesignPowerSlide 14User InterfaceEffectsImplementationScheduleDivision of LaborSlide 20BudgetExtra FeaturesRisksFall Back PlanQuestionsECEN 4610CapstoneUniversity of ColoradoBoulder, CO 80303January 29, 2009School of Rock PDRCheyenne AberleDrew VeldhuizenSwain BrooksDan ReedECEN 4610CapstoneNow Presenting…Now Presenting…2Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenDrew VeldhuizenECEN 4610CapstoneProject OverviewProject Overview3Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneDesignDesignPCB mounted in body of guitar.Motors mounted to the back side of the head of the guitar.Using DSP, A/D converters, and microcontroller, analyze signal and control motor movement to achieve desired pitch.User Interface via LCD touch screen.Multi-colored LED’s next to each string to indicate in tune or out of tune.4Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneBlock DiagramBlock Diagram5Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneGuitarGuitarElectric guitarAudio output jack on guitar outputs signal for analysisSignal output via magnetic “pick-ups” already built into the guitarLooking for guitar at local shops and onlineBased on measurements, torque on tuning knobs requires 12 to 16 oz-in6Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstonePCB DesignPCB DesignMSP430 MicrocontrollerMotor DrivesSix drives will be built and used to control six stepper tuning motors, one for each tuning knob.DSP Processing ChipUsing Fourier Transforms, will process frequency of each string and determine how far off it is from the correct pitch.AccelerometerUsed for effects similar to star power in Guitar Hero.LCD/Touch ScreenGUI for tuning presets, effects, and feedback to user7Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneNow Presenting…Now Presenting…8Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenCheyenne AberleECEN 4610CapstoneMicrocontrollerMicrocontrollerTI MSP430 16-bit microcontroller32 kHz, 1.8V to 3.6V, ultra-low-powerInterface to DSP chip through I2C communication9Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneDSP ChipDSP ChipFreescale Semiconductor DSPB5637124-bit Audio Digital Signal ProcessorUtilizes I2C communication with microprocessor180MHz core, 3.3V10Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneFilteringFilteringFiltering performed in the microcontrollerIdeally, strum all strings at once and circuit filters signals, outputs information to each motor controller for optimized tuningThe guitar might need to be strummed 3 to 4 times to provide adequate data for the tuning circuit11Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneMotor DesignMotor DesignStepper Motors similar to the Sure Step 83oz-in motor will be used to turn the tuning knobs on the guitar head.Motors will be mounted on the head with wires run through the neck of the guitar to the microcontroller.12Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstonePowerPowerAC to DC Power Converter Plugs into 120VAC 60Hz outlet.Used to recharge the battery Also good application for use at a performanceEnsures guitar always has enough power for tuning during a showRechargeable Lithium-Ion batteryAble to supply enough power to tune the guitar a few times before recharging is necessary.13Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneNow Presenting…Now Presenting…14Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenDan ReedECEN 4610CapstoneUser InterfaceUser InterfaceLCD Touch ScreenCreates a graphical user interface Allows user to select different tuning schemesDrop D, double drop D, standard, etcUser can also customize tuning schemeMost logical would be a lay-over resistive touch screen for an LCD displayLED’sNext to each string below the bridge.Indicates in or out of tune for each string based on the color (eg. Green for in tune, red for out of tune)15Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneEffectsEffectsAdding effects to the guitar can up-scope this project if neededDistortion, Wah Wah, Reverb, etc…The XYZ accelerometer will determine which effect is enabled based on the direction the guitar moves.Can increase (1) the ease of turning on effects and (2) the excitement of performances.16Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneImplementationImplementationPCB will be set into the body of the guitar.Motors will be attached to the head of the guitar.The LCD touch screen can be mounted in the front or back of the guitar body, whichever is more convenient to the user.The rechargeable battery will be mounted in the backside of the guitar body with an input jack for the AC to DC power converter.17Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneScheduleSchedule18Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenECEN 4610CapstoneDivision of LaborDivision of LaborDrew VeldhuizenMotor ControlPCB DesignDan ReedPCB DesignSoftware19Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenCheyenne AberleDSPMechanical / ControlSwain BrooksDSPSoftwareGroupTechnical and User ManualECEN 4610CapstoneNow Presenting…Now Presenting…20Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenSwain BrooksECEN 4610CapstoneBudgetBudget21Capstone PDRECEN 4610 Dan Reed Cheyenne AberleSwain Brooks Drew VeldhuizenItem #