Engr102Final

Engr102Final - ENGR 102 - Winter 2011 Freshman Engineering...

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Unformatted text preview: ENGR 102 - Winter 2011 Freshman Engineering Design Lab Lego NXT Design Summary ENGR 102 Section 009, Group 2 Date: January 31, 2011 Submitted to: Eli Fromm and Pramod Abichandani Team Members: Evan Kahl John VanZelst Project Synopsis The task at hand asks a Lego robot to successfully navigate an arena, while also monitoring the walls so that it may locate and press certain colored buttons. The robot will have to be able to interact with its environment to determine which commands to execute. This seemingly simple process becomes more difficult to recreate in artificial intelligence. In order to work, the large assignment needs to be broken down into simpler tasks that are manageable to code for. But before any coding can be done, an understanding of the robotic components and developed design must be acquired. Sensor Analysis One of the most important resources to the NXT robot is the vast set of sensors that it is equipped to handle. The term sensor is very apt in explaining what these devices due. In essence, they look for a specific type of input and when they sense this input, they relay that information to the robots brick in order to process it. Each sensor has its unique signal that it searches for and for each search there is a different method that is used when finding the input. The sensors the NXT robot can utilize are the light, ultrasonic, touch, sound, and color sensor. It is only through the proper understanding of the function and limitations of these sensors collectively will one be able to determine which sensors are the correct choice for this module. Light Sensor The primary goal of the light sensor is the ability to detect the amount of light intensity exists upon a given surface. The sensor works by passing an electrical current through a photo- resistor, usually based on some CdS derivative that varies in resistance based on the amount of light that it is exposed too. When exposed to high levels of light, the energy from the light frees up electrons in the resistor allowing more energy to flow with less resistance. In areas of low- light, the resistor is not exposed to as much energy and thus has higher resistance. Because the values of resistance can change, the light sensor is called a variable resistor. The light sensor has the output range from zero to one hundred which represents the intensity of the light detected by the sensor. It is the values of resistance that correspond to the light intensity values, 0 for no light and up to 100 for bright light. One limitation of this sensor is that light varies from setting to setting. Because of this variance, the sensor must be calibrated for the specific environment so the darkest object will register as 0 and the brightest will register as 100. Another limitation of the light sensor is that it cannot distinguish between wavelengths of light, only amount of light, thus making it difficult to characterize color. Because the sensor is reading light presence, it is normally only effective characterize color....
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This note was uploaded on 10/07/2011 for the course ENGR 102 taught by Professor Primerano during the Winter '10 term at Drexel.

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Engr102Final - ENGR 102 - Winter 2011 Freshman Engineering...

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