Sensors is a broad subcategory of hardware components responsible for collecting data from a robot's environment, mechanisms, and electronic systems. It encompasses distance, position, pressure, temperature, voltage, current, contact, and numerous other sensor types. This subcategory applies when a component is sensory in nature but does not belong to a more specific group such as LiDAR or Vision Components.

Ultrasonic Sensor is a distance-sensing device that operates by emitting and receiving ultrasonic waves. In robotics, it is widely used for basic obstacle detection, distance measurement, short-range navigation, and safety assistance. Ultrasonic sensors are common in mobile, educational, and industrial robots, particularly where low-cost and reliable object detection is required.