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A capacitive sensor ("capsense") measures capacitance, but normally this is the means to measuring something else: for example moving your hand close to a metal plate increases its capacitance to ground.  Measuring the capacitance thus measures the the touch (capacitive touch sensor) or near-touch.  Two insulated electrodes on either side of a glass tube can detect the presence of water in the tube by the change capacitance.
 
A capacitive sensor ("capsense") measures capacitance, but normally this is the means to measuring something else: for example moving your hand close to a metal plate increases its capacitance to ground.  Measuring the capacitance thus measures the the touch (capacitive touch sensor) or near-touch.  Two insulated electrodes on either side of a glass tube can detect the presence of water in the tube by the change capacitance.
  
* [http://www.unorthodox.com.au/wiki/index.php?title=Touchpad_Project_0.9.7 Unorthodox Engineers: "Touchpad Project"] is an open-hardware cap-sense device with a 4x5 node grid of plates. Is it a [[sensors#multi-touch sensor]]?
 
 
*[http://www.instructables.com/id/Building-a-Capacitive-Liquid-Sensor/ Building a Capacitive Liquid Sensor]
 
*[http://www.instructables.com/id/Building-a-Capacitive-Liquid-Sensor/ Building a Capacitive Liquid Sensor]
 
* [http://emergent.unpy.net/01219970985 "Two-element capacitative touch sensor"] with an Arduino. Hints at how to extend to more elements.
 
* [http://emergent.unpy.net/01219970985 "Two-element capacitative touch sensor"] with an Arduino. Hints at how to extend to more elements.
 
*[http://www.capsense.com/capsense-wp.pdf Capacitive Sensors] a pdf  
 
*[http://www.capsense.com/capsense-wp.pdf Capacitive Sensors] a pdf  
 
 
 
Mark Lee.
 
"Build A Touch-Sensor Solution For Wet Environments".
 
Electronic Design 2008.
 
[http://electronicdesign.com/content.aspx?topic=build-a-touch-sensor-solution-for-wet-environments&catpath=components]
 
[http://electronicdesign.com/article/components/build-a-touch-sensor-solution-for-wet-environments.aspx]
 
[http://electronicdesign.com/Articles/Index.cfm?AD=1&AD=1&ArticleID=19873]
 
 
 
[Is this useful for multi-touch?]
 
Motorola E-Field Sensor Contest
 
http://www.jandspromotions.com/efield2003/index.htm
 
''Is there any difference between a "E-Field Sensor" and a capacitive proximity sensor?''
 
  
 
Some kinds of capacitive sensors can be used as [[sensors#multi-touch sensor]]s for a [[multi-touch display]].
 
Some kinds of capacitive sensors can be used as [[sensors#multi-touch sensor]]s for a [[multi-touch display]].
 
* Photos tagged "capsense" on Flickr: [http://www.flickr.com/photos/macetech/tags/capsense/].
 
 
[http://forum.sparkfun.com/viewtopic.php?f=14&t=26168 Sparkfun discussion forum: "Touch Sensing using only two pins with no extenal components"]
 
 
* [http://forum.sparkfun.com/viewtopic.php?f=5&t=15843 Sparkfun discussion forum: "QT Series Touch Sensors."]
 
 
[http://forum.sparkfun.com/viewtopic.php?f=14&t=14154 Sparkfun discussion forum: "Capacitive Touch Sensor"]
 
 
* [http://forum.sparkfun.com/viewtopic.php?f=14&t=13588 Sparkfun discussion forum: "LPC2148 project with a lot of goodies" (including capacitive touch sensor)]
 
 
[http://forum.sparkfun.com/viewtopic.php?f=14&t=10726 Sparkfun discussion forum: "Using a battery as a touch sensor"]
 
 
* [http://www.psocdeveloper.com/forums/viewforum.php?f=22 CapSense forum at PSoC Developer]
 
  
 
=== Current Sensor ===
 
=== Current Sensor ===
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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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* [http://www.sensorsportal.com/HTML/Sensor.htm Sensors Web Portal]
 
* [http://www.sensorsportal.com/HTML/Sensor.htm Sensors Web Portal]
 
* [http://www.prc68.com/I/Sensors.shtml Sensors © Brooke Clarke 2000 - 2007]
 
* [http://www.prc68.com/I/Sensors.shtml Sensors © Brooke Clarke 2000 - 2007]
* [http://www.piclist.com/techref/io/sensor/interface.htm Micro controller interfacing to analog sensors (such as the LM335A)]
 
 
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