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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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=== Gas sensor === | === Gas 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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=== 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 | ||
− | * | + | * Pizio (sp) Electric unint can both produce and detect vibrations |
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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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=== Pressure and Barometric Sensor === | === Pressure and Barometric Sensor === | ||
Solid state units have become available for this. We need more material here. They can be used for weather stations, measuring altitude, or measuring pressure. | Solid state units have become available for this. We need more material here. They can be used for weather stations, measuring altitude, or measuring pressure. | ||
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=== Rotary Encoder === | === Rotary Encoder === | ||
− | A rotary encoder is a device that measure ( or encodes ) rotational motion. The old fashioned mice with a ball used dual | + | A rotary encoder is a device that measure ( or encodes ) rotational motion. The old fashioned mice with a ball used dual rotery encoders one to measure motion in the x direction one to measure motion in the y direction. This may be done using switching technology or by using optical methods ( so some encoders may be considered optical electronics ). Even stepper motors may be used as rotary encoders. It normally requires a microcontroller ( or speciality chip ) to decode the signals. In addition to mice rotary encoders are used for the user control on volume controls ( finally coupled to say digital potentiaometrs ), measure the position of joints in robots, or measuring the speed and/or positon of motors ( as in some servo motors ). |
* [http://www.arduino.cc/playground/Main/RotaryEncoders Reading Rotary Encoders] | * [http://www.arduino.cc/playground/Main/RotaryEncoders Reading Rotary Encoders] | ||
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* [http://www.ubasics.com/adam/electronics/doc/rotryenc.shtml Rotary Encoders] | * [http://www.ubasics.com/adam/electronics/doc/rotryenc.shtml Rotary Encoders] | ||
* [[Experimenting with Stepper Motors as Rotary Encoders using a PIC running BoostC Project]] | * [[Experimenting with Stepper Motors as Rotary Encoders using a PIC running BoostC Project]] | ||
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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. | ||
*[http://spreadsheets.google.com/pub?key=pobKDna9aVYccbtu0zqXvEA&gid=0 thermistor test result] from mainland china - shenzhen | *[http://spreadsheets.google.com/pub?key=pobKDna9aVYccbtu0zqXvEA&gid=0 thermistor test result] from mainland china - shenzhen | ||
− | == | + | === Stress Sensor === |
+ | One type is know as a strain gage. Often based on materials where the resistance varies when elongated. Typically have very small signal output that are measured in bridge configurations. | ||
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== Further Reading == | == Further Reading == | ||
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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]] |