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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