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=== Capacitive Sensor === | === Capacitive Sensor === | ||
− | + | These measure 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 ( 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. | |
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*[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. | ||
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− | + | Some kinds of capacitive sensors can be used as [[sensors#multi-touch sensor]]s. | |
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− | Some kinds of capacitive sensors can be used as [[sensors#multi-touch sensor]]s | ||
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=== Current Sensor === | === Current Sensor === | ||
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=== IR Infra Red Sensor Reciever Detector === | === IR Infra Red Sensor Reciever Detector === | ||
− | * See | + | * See Light Sensor |
* [[Infra Red Receiver Pinout]] | * [[Infra Red Receiver Pinout]] | ||
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* [http://en.wikipedia.org/wiki/Passive_infrared_sensor Passive infrared sensor From Wikipedia, the free encyclopedia] | * [http://en.wikipedia.org/wiki/Passive_infrared_sensor Passive infrared sensor From Wikipedia, the free encyclopedia] | ||
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=== Knock Sensor === | === Knock Sensor === | ||
* [http://www.arduino.cc/en/Tutorial/KnockSensor Knock Sensor] | * [http://www.arduino.cc/en/Tutorial/KnockSensor Knock Sensor] | ||
* Any sound sensor, microphone, will be sensitive to Knocks | * Any sound sensor, microphone, will be sensitive to Knocks | ||
− | * | + | * piezoelectric sensor ("piezo") Electric unit can both produce and detect vibrations [http://en.wikipedia.org/wiki/piezoelectric_sensor Wikipedia: piezoelectric sensor] |
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=== Light Sensor === | === Light Sensor === | ||
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A magnetic field sensor is used inside some kinds of current sensor: [[current sense#magnetic field sense]] | A magnetic field sensor is used inside some kinds of current sensor: [[current sense#magnetic field sense]] | ||
* [http://en.wikipedia.org/wiki/Hall_effect_sensor Hall effect sensor] | * [http://en.wikipedia.org/wiki/Hall_effect_sensor Hall effect sensor] | ||
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* "Planar Hall sensor for influenza immunoassay" by Louise Wellendorph Ejsing 2006 | * "Planar Hall sensor for influenza immunoassay" by Louise Wellendorph Ejsing 2006 | ||
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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 | + | 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.educypedia.be/electronics/sensors.htm Educupedia Sensors] Links to material on a variety of sensors. | * [http://www.educypedia.be/electronics/sensors.htm Educupedia Sensors] Links to material on a variety of sensors. | ||
* [http://www.seeedstudio.com/depot/sensors-c-6.html?page=1&sort=20a seeed_studio Sensors] A catgalog of sensors, prices look good] | * [http://www.seeedstudio.com/depot/sensors-c-6.html?page=1&sort=20a seeed_studio Sensors] A catgalog of sensors, prices look good] | ||
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[[Category:Components]] | [[Category:Components]] |