Sensor

A sensor is a device that detects, or senses, a signal. Most sensors are electrical or electronic, although other types exist. A sensor is a type of transducer.

Since a signal is a form of energy, sensors can be classified according to the type of energy they detect. For example:

• light sensors
• sound sensors
• heat sensors
• electrical sensors
• mechanical sensors
• etc.

The human sensors are the senses.