Difference between revisions of "Sensors"
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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 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] | ||
* [http://www.robotroom.com/Counter.html An Electronic Counter Project for Digital and Analog Signals, including Quadrature Encoders] | * [http://www.robotroom.com/Counter.html An Electronic Counter Project for Digital and Analog Signals, including Quadrature Encoders] | ||
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| + | === Linear Encoder === | ||
| + | Like rotary encoders but for linear motion. Modern digital calipers are based on this technology ( i think ). Positioning of print heads in computers may also uses this to position the print head. | ||
=== Temperature Sensor === | === Temperature Sensor === | ||
Revision as of 18:53, 30 March 2008
Accelerometers, Gyroscopes, Temperature Sensors, Pressure Sensors, ...
Contents
Accelerometer
These measure ( gasp ) acceleration. May be caused by gravity or the second derivative of position ( relative to an inertial frame ). Since acceleration is a vector to go the whole distace you need a 3 axis sensor, but often 1 or 2 D will do. Often the output is a voltage(s). Feed it to a microcontroller with an a to d converter, perhaps through an operational amplifier. Op amp
- Accelerometer Breakout Board - ADXL322 +/-2g SKU#: SEN-00849 Price: $29.95 From SparkFun. Also links to other info.
- Buffered ±2g Accelerometer Product ID: DE-ACCM2G Price: $22.95 Also other links.
- PIC Links Then search for Accelerometer.
Gas sensor
MiCS 4514 CO and NOx sensor
Knock Sensor
Magnetic Field Sensor
Photo Diode/Transistor
Rotary Encoder
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 ).
- Reading Rotary Encoders
- An Electronic Counter Project for Digital and Analog Signals, including Quadrature Encoders
Linear Encoder
Like rotary encoders but for linear motion. Modern digital calipers are based on this technology ( i think ). Positioning of print heads in computers may also uses this to position the print head.
Temperature Sensor
some are analog some use microcontroller interfaces LM34, LM35
Further Reading
- WSN:Sensors
- Interfacing with Hardware See the section on "Input" Writtern for the arduino but usefull just for the info on sensors.
- Welcome to the ITP Sensor Workshop Wiki. A whole wiki on sensors, looks good.
