Difference between revisions of "Sensors & Circuits"

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(Reflective Optical Sensor)
(Reflective Optical Sensor)
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===Reflective Optical Sensor===
 
===Reflective Optical Sensor===
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The reflective optical sensor ( Datasheet ) consists of an infrared LED, labelled "E" for Emitter on the diagrand and on the package, and a phototransistor that passes an amount of current proportional to the reflected light received. The phototransistor is labelled "S" for Sensor. The one leg of the sensor is connected to +5V, which supplies current, and the voltage drop across the 10k resistor that we measure is proportional to the amount of current.
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There is a continuous voltage response for objects over a short range of proximity to the sensor. The response is not linear. Linearity can be approximated by the log of the log of the signal.
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<center>
 
[[Image:optical.png]]
 
[[Image:optical.png]]
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</center>

Revision as of 21:07, 25 June 2007

Hall Effect

Mulitplexing

IR Distance

Sharp

Reflective Optical Sensor

The reflective optical sensor ( Datasheet ) consists of an infrared LED, labelled "E" for Emitter on the diagrand and on the package, and a phototransistor that passes an amount of current proportional to the reflected light received. The phototransistor is labelled "S" for Sensor. The one leg of the sensor is connected to +5V, which supplies current, and the voltage drop across the 10k resistor that we measure is proportional to the amount of current.

There is a continuous voltage response for objects over a short range of proximity to the sensor. The response is not linear. Linearity can be approximated by the log of the log of the signal.

Optical.png