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sensor
an input device that measures something
some pass data…
sensor
an input device that measures something
- some pass data immediately to omputer so it can be processed
- others store data, transferring it when connected to computer
temperature senser
takes reading of surrounding temperature. can be used in thermometer, mobile phone, food industry, metal industry etc.
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light sensor
can be used in street light, car, mobile phone
when computer receive reading below a pre-set threshold, a signal is sent to turn on the bulb. when another signal is above threshold, a further signal is sent to turn off the bulb.
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magnetic field sensor
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smart phone, MRI, military detector
gas sensor
determine whether there's been a lea of harmful gas. they are used as part of devices to improve safty, for example natural gas and carbon monoxide.
a sensor by itself isn't very useful, but once it is used in a device, it become more useful. in a sensor detecting natural gas, a visual display is there to indicate rise in nearby concentration
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motion sensor
PIR
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turn on a light when people is near, open a door when people is near, a photo is taken when animal is detected
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accelerometer
used in game input, such as baseball bat, tennis racket or a gun.
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