Sensors Flashcards
Sensor
A type of input device that detects changes in the environment surrounded it.
Ambient light
The brightness or darkness at the current time.
Light sensors
Is a device that detects light. It will detect the ambient light level. Can be used in street lights.
Security light sensors
The sensors can beam light form one sensor to another. If a beam of light is broken by a person, the next sensor will recognise it and send the information to computer.
Thermostat
A device that keeps temperature at constant level. It has two pieces of metal that will close together or open up depending on the current temperature.
Temperature sensors
A device that measures heat generated by an object or system. By measuring the change in heat, the sensors can detect changes in temperature.
Contact temperature sensors
Need to have actual physical contact with an object to measure its temperature.
Non-contact temperature sensors
Measures energy that is transmitted or radiated from an object.
Infrared sensor
It detects infrared radiation that emits from a person or object. Infrared waves are emitted by many things but people cannot see it.
Motion sensors
By sending microwaves that bounce off objects, the sensor would detect a change in the usual pattern if a moving object were to interrupt them.
Accelerometer
A device that detects rotation and tilt. Used in phones to rotate screen depending on the angle at which the user is holding the device.
Magnetic field sensors
Measure the strength and direction of a magnetic field and respond to its changes. Used in phones to provide application that act as compass.
Gas sensors
A presence of gas in a certain area trigger a response if the amount gets too high or too low.
Pressure sensors
Measures the pressure of a liquid or a gas. In water pipes, the conduction of electricity at certain area can monitor the pressure. If the level of electricity conducted increases, it means that pressure is higher.
Moisture sensors
Measures the amount of moisture in a certain material. Used to measure the moisture of soil. Getting the correct level of moisture into soil is vital for farming crops.
