ceLEDsTIal positioning Team: Stijn Wielandt Steven De Lausnay Advising Professor: Lieven De Strycker
Navigation a
3000 years ago…
Today
Why? GPS: doesn’t work indoor RF-localization: Complex & expensive installation Crowded RF spectrum Restrictions (e.g., hospitals) Poor performance IR / Ultra-sound: Good performance Invasive installations of dedicated hardware
Visible Light Communication Information is transmitted to users by modulating light intensity CDMA: every LED gets a unique code Why? Dense distribution of light fixtures Continuous lighting is already present Low cost hardware at the transmitter side Combines both illumination and communication … 1 bit/sec 10 bits/sec 1000 bits/sec
Visible Light Positioning System
LED drivers
LED drivers 700 mA with OOK-modulated data @ 16.384 kbps CSD88539ND: Dual MOSFET LM3421: LED controller with PWM input MSP430G2302: microcontroller LM3480-3.3: Voltage regulator
LED driver power supplies
LED driver power supplies 85 VAC - 265 VAC to 12 VDC flyback converter with active rectification UCC28740: 3 A flyback controller TPS71550: 5 V power supply for rectifier controller UCC24610: Green rectifier controller TL431A: precision shunt regulator CSD19531Q5A: rectifying MOSFET
LED driver power supplies 85 VAC - 265 VAC to 12 VDC flyback converter with active rectification UCC28740 TPS71550 UCC24610 TL431A CSD19531Q5A
Transmitters
Transmitters d
Receiver boosterpack
Receiver Boosterpack Converts the optical power back into an electrical signal OPA2846: Dual OPAMP (low noise) Trans-Impedance Amplifier Ambient light filter LMH6682: Dual OPAMP for amplification and filtering TPS60403: 5 V negative power supply
Receiver Boosterpack Converts the optical power back into an electrical signal OPA2846 LMH6682 TPS60403
Receiver
Receiver EK-TM4C1294XL Tiva C Series Launchpad for data sampling and communication with the PC Receiver boosterpack 3D-printed lens mount
Visible Light Positioning System
Visible Light Positioning System
ceLEDsTIal positioning Independent transmitters Power supply + LED driver with control logic Boosterpack receiver Combination of analog filters and amplifiers Compatible with the TIVA C launchpad Results Position errors of 6.5 to 20.6 cm in a test configuration Luminous efficacy of 79 lm/W Only Texas Instruments ICs: 12 different pcs
LED there be light and you can navigate