INTELLIGENT BLINKERTexas Instruments

Analog Design Contest 2013

Pietro Buccella Camillo Stefanucci Denis Sallin Naser Khosro Pour Theodoros Kyriakidis

Advising Professor: Maher KayalUniversity: École polytechnique fédérale de LausanneDate: 05-11-2013

TURNING: SIGNALIZATION?

CAR BIKE Turn-on directional indicators Use hand signalization

Hand signals are unnoticed in the dark!! For bicycle safety, visibility is key!!

IDEA

Right turn

Left turn

DARKWEARABLE BRACELETIT BLINKS ACCORDING TO

THE CYCLIST ARM-MOTION

BLOCK DIAGRAMPOWER MANAGEMENT: Outdoor Application -> Solar Energy -> Low PowerMOTION DETECTION: Detect cyclist arm movement -> Factored Quaternion AlgorithmDEBUG INTERFACE: Sensors Calibration, Algorithm Debug

Dynamic Maximum Power Point Tracking (MPPT)

USB Linear Li-Ion Battery Charger

SOLAR CELL OUTPUT POWER

BLOCK DIAGRAMPOWER MANAGEMENT: Outdoor Application -> Solar Energy -> Low PowerMOTION DETECTION: Detect cyclist arm movement -> Factored Quaternion AlgorithmDEBUG INTERFACE: Sensors Calibration, Algorithm Debug

Factored Quaternion Algorithm

Sensor Raw Data

LED Driver

BLOCK DIAGRAMPOWER MANAGEMENT: Outdoor Application -> Solar Energy -> Low PowerMOTION DETECTION: Detect cyclist arm movement -> Factored Quaternion AlgorithmDEBUG INTERFACE: Sensors Calibration, Algorithm Debug

• Real time sensor raw data analysis • Data memory for sensor data backup• Sensor Calibration

CIRCUIT IMPLEMENTATION

BQ25504

BQ24090

Li-ion battery

TPDS73001

MEMS

MSP430F5xx TCA6507

POWER MANAGEMENT: Outdoor Application -> Solar Energy -> Low PowerMOTION DETECTION: Detect cyclist arm movement -> Factored Quaternion AlgorithmDEBUG INTERFACE: Sensors Calibration, Algorithm Debug

MEMORY

POWER MANAGEMENT: Outdoor Application -> Solar Energy -> Low Power

MOTION DETECTION: Detect cyclist arm movement -> Factored Quaternion Algorithm

RESULTS

10% of direct sun condition PV provides 7.7 mW BQ25504 with 80% efficiency6.1 mW System total power consumption reaches to 5 mWAutonomous operation even at 10% of direct sun illumination!!

When the arm is moving left or right the threshold for the yaw angle is reached turning on the LEDs

The up and down movement is indeed filtered out by the tilt-compensation algorithm LEDs off

SOLAR CELL OUTPUT POWER

LED on LED on LED on

Arm right Arm right(rotated wrist)

Arm up Arm left

LED off

ACKNOWLEDGEMENT

Naser Khosro Pour

• TI university program• ADVISING PROFESSOR: MAHER KAYAL• ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE EPFL

Denis Sallin

Camillo Stefanucci

Theodoros Kyriakidis

PietroBuccella