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=== Temperature Sensor  ===
 
=== Temperature Sensor  ===
Some are analog some are digital.  All can use microcontroller interfaces again digital or analog.  Two analog devices are LM34 and LM35, they are very easy to use because the voltage output is directly proportional to the temperature.  Dallas semiconductor makes a line of sensors based on their [[one wire]] networking, cool.  Temperature may also be sensed by thermistors ( temperature sensitive resistors ), the forward voltage on a diode ( or transistor ) or by thermocouples ( junctions of two different conductors ).  Thermocouples can work up to almost the melting temperature of the conductors.  You can also sense temperature based on the light emitted ( usually ir ) from the object.  Many of the temperature sensors can be highly non-linear in their response, programming in a microcontroller can be used to linearize the readings.
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Some are analog some are digital.  All can use microcontroller interfaces again digital or analog.  Two analog devices are LM34 and LM35, they are very easy to use because the voltage output is directly proportional to the temperature.  Dallas semiconductor makes a line of sensors based on their one wire networking, cool.  Temperature may also be sensed by thermistors ( temperature sensitive resistors ), the forward voltage on a diode ( or transistor ) or by thermocouples ( junctions of two different conductors ).  Thermocouples can work up to almost the melting temperature of the conductors.  You can also sense temperature based on the light emitted ( usually ir ) from the object.  Many of the temperature sensors can be highly non-linear in their response, programming in a microcontroller can be used to linearize the readings.
  
 
*[http://www.instructables.com/id/Water-proofed-temperature-sensor/ Water proofed temperature sensor] from instructables.
 
*[http://www.instructables.com/id/Water-proofed-temperature-sensor/ Water proofed temperature sensor] from instructables.

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