Types of Sensor Flashcards
1
Q
What do humidity (/moisture) sensors do?
A
- control / monitor dampness of soil in greenhouse
- control / monitor dampness of air in greenhouse
- monitor dampness levels in a factory making microchips
2
Q
What do light sensors do?
A
- switch street lighting off- dawn / off - dusk
- automatically switch car’s headlight on when dark
- close/open window blinds in a greenhouse - maintain light levels
3
Q
What do infra-red sensors do?
A
- turn on car’s windscreen wipers automatically when raining
- detection of intruders in a burglar alarm system
- count number of people entering / leaving a supermarket
4
Q
What do pressure sensors do?
A
- detection of intruders in a burglar alarm system
- check weight of vehicle on weigh bridge
- measurement of air pressure to forecast weather
5
Q
What do acoustic sensors do?
A
- pick up noise levels (e.g footsteps) in a burglar alarm system
- detect noise of liquids dripping from pipe in oil refinery
- monitor sound levels in car factory
6
Q
What do gas sensors do?
A
- monitor CO2 / O2 levels in a river
- monitor CO2 / O2 levels in the air in a greenhouse
- checks carbon monoxide levels in a car exhaust system
7
Q
What do pH sensors do?
A
- monitor / control acidity levels in a chemical process
- measurement of pollution levels in a river
- check acidity levels in soil in a greenhouse
8
Q
What do magnetic field sensors do?
A
- used in phones to know which direction it is pointing
- used in motors of CD players
- used in vehicle anti-lock braking systems
9
Q
What do temperature sensors do?
A
- control central heating system in house
- control / monitor heat output in chemical process
- control / monitor environmental temperature in greenhouse
