1. Photo Response Team Requirement: Use the Dr.DAQ tool to measure the photo response of different photo detectors as a function of light color and frequency and capture the output as a function of the input color. Team Members: Saul Tiscareno Owen Ebuehi Christopher McDonald Sponsor/Project Manager: Dr. John Robertson Tuscareno, Ebuehi & McDonald- Dr. Daq Experiment 10-25-11

2. Team Plan Planning Mount a CdS Photocell directly onto the RGB LED and measure its output voltage and resistance using the colors Red, Green, & Blue. Tools: DrDAQ's RGB LED DrDaq Oscilloscope 5V DC breadboard, 1k Ohm resistor CL904L CdS Photocell (LDR) (directly on the LED) PicoScope 6 software Expected Outcome We expect that the color blue will produce the largest voltage response from the photosensor. EHS Statement Electrical, Ground, Low voltage & current levels Tuscareno, Ebuehi & McDonald- Dr. Daq Experiment 10-25-11

3. Results The voltage output is highest for the Red LED at about 3.69V. The resistance of the LDR is highest for the color blue at 788. Tuscareno, Ebuehi & McDonald- Dr. Daq Experiment 10-25-11

4. Analysis The data shows that red, with the lowest frequency, provides more light to the [light-triggered resistor], while blue provides the least light. One would expect blue to provide the highest output voltage, due to a higher frequency containing more energy. We believe that, due to blue light having more energy, the blue LED provides less actual light, causing the LDR allow less voltage through compared to the red LED, which is able to provide a lot more red light with the same amount of energy put into it. Tuscareno, Ebuehi & McDonald- Dr. Daq Experiment 10-25-11

5. Experiment 2 Objective: Measure the output response of different RGB led light colors. Plan: Mount and isolate the phototransistor over the RGB led light on the DrDaq and measure its output voltage, resistance to the led colors red, green and blue. Tools: DrDAQ's RGB LED DrDaq Oscilloscope 5V DC breadboard, 1k Ohm resistor Phototransistor PicoScope 6 software Expected outcome: Tuscareno, Ebuehi & McDonald- Dr. Daq Experiment 10-25-11