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    Sensors are used in everyday applications which vary from sensing light to sensing seismic waves. Some quantities that we normally sense are as follows: Temperature, Light, Seismic Waves, and Sound. Each sensor included plays a very vital part in the process. Transduction is a process that involves two systems of energy, which when one is introduced into the system it is then converted into a different form of energy that is desired. In other-words transduction is just like a solar panel that when it receives the direct sunlight it converts that light into energy that we can use.

    The end-point is the light dependent resistor (LDR). This component when in a dark environment enables the resistance to increase and let a small current flow which in turn triggers the relay to switch the power to the light emitting diode (LED). When in a bright environment the resistance decreases and therefore triggering the relay back to normal position and shutting off the LED. There is a variable potentiometer that adjusts the sensitivity of the LDR; it changes the how much light can be received by the variable resistor.

Five examples that could benefit from the LDR:

  1. A night light inside a bathroom so that to conserve energy it would go off when the bathroom light turns on. So that you would not have to unplug it when not in use.
  2. On an airplane so that when the overhead lights go out the smaller more energy efficient lights come on automatically.
  3. If a car was to get into an accident and all the lights turn off and everything is not visible, then little LED’s would light up all around the car so it could be found in the dark more easily. This would not require a lot of energy to do this, although if the connections were severed than it would not work.
  4. When the lights go out in my room the computer screen gets brighter with the help of the LDR.
  5. In a car when the sun goes down the lights on the dash automatically turn on.

 

                

    Picture of a LDR        Schematic Representation of a LDR

 

Resources:

    http://www.technologystudent.com/images4/ldr1a.gif

    http://upload.wikimedia.org/wikipedia/en/2/2d/Ldr.gif

    http://en.wikipedia.org/wiki/Photoconductor



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