Explain the range and proximity sensor.

Proximity sensors are non-contact sensors that detect the presence of an object when it enters the sensor’s field. The sensor may use sound, light, infrared, or electromagnetic fields to detect the object. A range sensor determines the distance between the sensor and the object in its proximity. Examples include ultrasonic sensors, which are used in object detection and measuring distance, and proximity sensors, which are used in cell phones and home appliances.