What is a sensor?

• Hardware devices that measures physical properties
• A digital machine that changes things
• A physical machine that changes things
• Something that notices a change in something

What do gas sensors measure?

• Levels of different gases
• Light
• Sound
• Temperature

What do infra-red sensors measure?

• Motion/heat
• Sound
• Acidity
• Pressure

What do light sensors measure?

• Light
• Acidity
• Pressure
• Humidity

What do temperature sensors measure?

• Temperature
• Pressure
• Motion/heat
• Light

What do pressure sensors measure?

• Pressure
• Sound
• Light
• Sound

What do humidity sensors measure?

• Humidity
• Pressure
• Motion/heat
• Light

What do acoustic sensors measure?

• Pressure
• Light
• Sound
• Level of different gases

What do pH sensors measure?

• Acidity
• Pressure
• Level of different gases
• Sound

What do magnetic field sensors measure?

• Magnetism
• Motion/heat
• Pressure
• Light