A sensor is a device that measures or detects a physical quantity and converts it into a signal which can be read by an observer or by an instrument.
A contact sensor measures or detects contact, such as for detecting if a door is closed.
A sensor is a device that measures or detects a physical quantity and converts it into a signal which can be read by an observer or by an instrument.
A contact sensor measures or detects contact, such as for detecting if a door is closed.