Difference between revisions of "Sensors & Circuits"

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==Voltage Divider==
 
  
[http://en.wikipedia.org/wiki/Voltage_divider Wikepedia]
 
 
Derivation from Ohm's Law
 
 
 
==IR Distance==
 
 
===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.
 
 
<center>
 
[[Image:optical.png]]
 
</center>
 
 
==Hall Effect==
 
 
[http://www.sensorwiki.org/index.php/Hall_effect Hall Effect] on Sensorwiki.org
 
 
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Latest revision as of 17:30, 28 June 2007