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Physical Sensors - Robot Parts

There are two categories of physical sensors, active and passive.

Active sensors - The sensor emits some form of energy and then measures the impact as a way of understanding the environment. These sensors often have restricted environments.

Some examples of active sensors include ultrasonic, laser, and IR sensors.

Passive sensors - The sensor receives energy already in the environment. These sensors consume less energy, but often have signal and noise problems.

An example of a passive sensor is a camera; it uses the energy in the environment to capture a snapshot.