gas, to detect the amount of carbon monoxide coming from a fire, light, controlling automatic headlights on a car, moisture, monitoring the soil conditions in a greenhouse, pressure, monitoring an automatic door, pH, checking to see if blood is starved of oxygen, motion, to detect the movement of a person playing a computer game, temperature, checking that food is safe to eat, humidity, can be used to predict the weather, magnetic field, to avoid metal objects coming into contact with each other.

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