ECE 477 Group 3The Gauntlet

George HadleyGeorge HadleyKelli HackerKelli Hacker

Sean MaSean MaJacob ChampionJacob Champion

Revised PSSCs

An ability to communicate sensor data via An ability to communicate sensor data via audio to the useraudio to the user

An ability to recharge and monitor an on-board battery

An ability to determine current location via An ability to determine current location via GPSGPS

An ability to direct the user to a “safe” An ability to direct the user to a “safe” waypointwaypoint

An ability to save acquired data to Flash An ability to save acquired data to Flash storagestorage

Block Diagram

Important Constraints

Power consumptionPower consumptionThe Gauntlet should last for a minimum of 10 The Gauntlet should last for a minimum of 10

hours – ideally morehours – ideally moreEach peripheral should be low-power or have Each peripheral should be low-power or have

a shutdown pina shutdown pinForm factor and durabilityForm factor and durability

Both size and weight are important!Both size and weight are important!Peripherals cannot be fragilePeripherals cannot be fragile

Audio Decoder Selection

STA013STA013 On-chip MP3 On-chip MP3

decodingdecoding 30 mA current draw30 mA current draw I2C or pure serial I2C or pure serial

interfaceinterface 24-bit serial PCM 24-bit serial PCM

outputoutput

VS-1011eVS-1011e Streaming WAV and Streaming WAV and

MP3 decoderMP3 decoder 50 mA active / 30 mA 50 mA active / 30 mA

inactiveinactive SPI interface (512-SPI interface (512-

byte packets)byte packets) Headphone driverHeadphone driver

Accelerometer Selection

Bosch BMA150Bosch BMA150 200 uA active draw200 uA active draw SPI interfaceSPI interface +/-8g maximum+/-8g maximum 12-LGA packaging 12-LGA packaging

(3x3 mm)(3x3 mm)

Analog ADXL345Analog ADXL345 40 uA active draw40 uA active draw SPI interfaceSPI interface +/-16g maximum+/-16g maximum Free-fall and motion Free-fall and motion

interrupt supportinterrupt support 14-LGA packaging 14-LGA packaging

(3x5 mm)… with a (3x5 mm)… with a breakout board breakout board availableavailable

Questions?