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Passive sensors monitor some condition in the environment They don t introduce anything into the environment; they simply sense what is happening around them A thermometer and a photocell are everyday examples of passive sensors If connected to a household heating system, a thermometer s findings are reported to a simple circuit in a household thermostat to tell the heater when to turn on or off Similar circuits are used to control air conditioners in warm climates Photocells monitor ambient light to sense how bright it is These are used in street lights to sense when the lights are no longer needed a circuit turns off the lights when the sun comes up Similarly, when the sun goes down at night, the light level drops to a predetermined level and a circuit turns the lights back on Another type of passive sensor is the passive infrared (PIR) sensor, sometimes called a pyroelectric sensor These sensors are commonly used to detect the presence of a person and activate a circuit They can control lights within a room or outside a house, or they can be used as a burglar alarm The sensor is a small crystal mounted within the housing that can sense the infrared radiation emitted by a person The sensor has a circuit that charges the crystal, and the presence of the radiation discharges the crystal, which is detected by another circuit This is called the pyroelectric effect The radiation is focused upon the crystal by a row of Fresnel lenses that cause a series of signal peaks as a person moves by Several autonomous robots have used these sensors to detect heat emissions from their surroundings For combat robots, an electronic thermometer can be used to monitor the internal temperature, the temperature of the motors, or batteries If the temperature gets too high, cooling motors can turn on or the power requirements can be reduced to avoid overheating A tilt sensor can be used to monitor whether the robot gets flipped upside down Once the sensor detects a flip, it can initiate an arm or piston that will flip the robot right side up Or, if the robot was designed to run upside down, the tilt sensor can be used to reverse steering controls, since an upside-down robot will turn in opposite directions than a right-side-up robot Another type of passive sensors that can be used are acoustic sensors that can listen for the motors of the opponent robot These sensors can help guide your robot toward its opponent The most complex-passive sensor is a charged coupled device (CCD) camera that is used to see the environment CCD cameras are part of a vision system When used alone, they require advanced object-recognition software and usually a dedicated computer They can also be used with active sensors to help simplify the computational software Vision systems are most commonly found at robot soccer events Recently, CCD cameras have been used to detect flames in the Trinity College Fire Fighting contest, and some members of the Seattle Robotics Society have developed methods to use CCD cameras and simple microcontrollers to see the lines in line-following contests.

Figure 6-48 A Perspective chart with a number of data point to compare Gross Profit and Gross Profit Margin

Summary

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The telecommunications systems include the variations of the local loop and the changes taking place within that first (or last) mile As the migration moves away from the local copper-based cable plant (a slow evolution for sure), the movement will be to other forms of communications subsystems to include the use of

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