What constitutes a sensor!

The sensor is composed of three parts: the sensitive element, the conversion element and the basic conversion circuit.

The sensing element is a component that directly senses the measured physical quantity, and determines the relationship between the output of another physical quantity (such as an elastic sensitive element that converts the force, torque to displacement or strain output).

Conversion element is the output of the sensitive components of the non electric power into circuit parameters (resistance, inductance, capacitance) and current or voltage and other electrical signals.

Basic conversion circuit is to convert the electrical signal into easy transmission, processing power.

Sensor is equivalent to the human sensory organs, generally divided into internal sensors and external sensors.