George Hadley Kelli Hacker Sean Ma Jacob Champion ECE 477 Group 3 The Gauntlet George Hadley Kelli Hacker Sean Ma Jacob Champion

Revised PSSCs An ability to communicate sensor data via audio to the user An ability to recharge and monitor an on-board battery An ability to determine current location via GPS An ability to direct the user to a “safe” waypoint An ability to save acquired data to Flash storage

Block Diagram

Important Constraints Power consumption The Gauntlet should last for a minimum of 10 hours – ideally more Each peripheral should be low-power or have a shutdown pin Form factor and durability Both size and weight are important! Peripherals cannot be fragile

Audio Decoder Selection STA013 On-chip MP3 decoding 30 mA current draw I2C or pure serial interface 24-bit serial PCM output VS-1011e Streaming WAV and MP3 decoder 50 mA active / 30 mA inactive SPI interface (512-byte packets) Headphone driver

Accelerometer Selection Bosch BMA150 200 uA active draw SPI interface +/-8g maximum 12-LGA packaging (3x3 mm) Analog ADXL345 40 uA active draw SPI interface +/-16g maximum Free-fall and motion interrupt support 14-LGA packaging (3x5 mm)… with a breakout board available

Questions?