By: Nathan Alcantara, Mathew Fendley, Jasen Slaman, Jack Ryan Zapata

 The focus of this project is to design an adaptive intelligent lighting controller that monitors the output light of a LED light fixtures for degradation of light intensity (500 lux measured at 8 feet) and color intensity changes.  Changes in either the intensity or color spectrum are flagged. In addition, the system must maintain the crew’s circadian rhythm experienced on a regular day on earth healthy.  The intent is to develop a working concept.

 Use commercial components  Unit uses AC power vs. using a battery  System programmed to change the threshold parameters of intensity and color spectrum (kept to red, green, and blue)  Can program for circadian rhythms.  Communications between the sensor/lighting system and the user interface can be wired or wireless.  Aesthetics and power consumption not a concern

 Six 32 Watt LEDs wired in parallel  12V AC power supply  4 DC/DC Converters  Aluminum heat sink  Customized board to help organize the wiring  Freescale Freedom Microprocessor  Sparkfun ISL29125 RGB Sensor

 Originally written for Arduino system on Galileo board  Complications, code rewritten on mbed platform for Freescale Freedom board  Utilizes PWM to independently change the duty cycle of each color of the LED arrays to simulate circadian rhythms  Demonstration will simulate full circadian rhythm in roughly 3 minutes

 Used spectrometer and lux meter to measure light intensity  Color temperature meter used for photography to capture and evaluate color temperature

 The system accurately simulates a regular circadian rhythm on a typical clear earth day.  The system can provide 500 lux at eight feet with the capabilities of providing more  Light system can be modified to simulate other environments, for different applications  Complications with sensor (Original code for Arduino worked, difficulty implanting sensors with mbed libraries)