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

2. 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

3. Block Diagram

4. 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

5. 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

6. 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

7. Questions?