感測器原理與應用.

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Presentation transcript:

感測器原理與應用

光感測器 Light Sensor  light dependent resistor (LDR) A photoresistor or light dependent resistor (LDR) is a resistor whose resistance decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. http://en.wikipedia.org/wiki/Photoresistor List of Photodetectors http://en.wikipedia.org/wiki/Light_sensor

光感測器 Light Sensor  light dependent resistor (LDR) http://www.seeedstudio.com/depot/grove-light-sensor-p-746.html?cPath=144_148

電子羅盤 3-Axis Digital Compass http://www.seeedstudio.com/wiki/Grove_-_3-Axis_Digital_Compass_V1.0 This 3-axis digital compass features a low field magnetic sensing multi-chip module HMC5883L, which provides up to 1° to 2° heading accuracy. HMC5883L consists of high-resolution HMC118X series magneto-resistive sensors. Magnetoresistance is the property of a material to change the value of its electrical resistance when an external magnetic field is applied to it. http://en.wikipedia.org/wiki/Magnetoresistance

電子羅盤 3-Axis Digital Compass Magnetic declination is the angle between compass north (the direction the north end of a compass needle points) and true north (the direction along the earth's surface towards the geographic North Pole[1]). The declination is positive when the magnetic north is east of true north. http://en.wikipedia.org/wiki/Magnetic_declination

電子羅盤 3-Axis Digital Compass Simply speaking, true north is the direction in which the north pole is located along the Earth's rotational axis, while magnetic north is the direction toward which the compass needle points. Magnetic declination varies both from place to place and with the passage of time. http://en.wikipedia.org/wiki/Magnetic_declination

電子羅盤 3-Axis Digital Compass Correction from Magnetic declination http://www.ngdc.noaa.gov/geomag-web/#declination