Underwater Ultrasonic Sensor: Enabling Precision Navigation for Robotic Pool Cleaners

Underwater Ultrasonic Sensor will be exhibited at the Consumer Electronics Show (CES) in Las Vegas, USA.

Consumer Electronics Show (CES)
Dates: January 6–9, 2026
Location: Las Vegas, USA
Booth Number: North Hall 10529

Reliable obstacle detection and distance measurement are fundamental for the autonomous operation of robotic pool cleaners. The underwater ultrasonic sensor, specifically engineered for this demanding aquatic environment, provides a robust and accurate solution for spatial awareness, ensuring efficient and collision-free navigation.

Core Technology: Ultrasonic Time-of-Flight (ToF) Principle
The sensor operates on the proven ultrasonic time-of-flight (ToF) measurement principle, adeptly adapted for underwater use. The process is efficient and continuous:

Emission & Propagation: The sensor emits ultrasonic pulses that propagate through water.

Reflection: These sound waves reflect off obstacles such as pool walls, steps, ladders, or other objects.

Reception & Conversion: The returning echoes are received by the sensor. The built-in high-sensitivity circuitry immediately converts the received analog signals into digital data.

Distance Calculation: An integrated MCU analyzes this data, calculating the precise distance to the obstacle based on the measured Time-of-Flight and the known speed of sound in water.

Engineered for the Aquatic Environment
Beyond its smart sensing core, the sensor is built to withstand long-term immersion and provide reliable performance, as defined by its key specifications:

Robust Protection: With an IP68 protection rating, the sensor is fully sealed against dust and can support long-term underwater immersion at specified depths, guaranteeing durability and longevity.

Operational Depth: It is designed to operate effectively at water depths up to 3 meters, covering the full range of residential and many commercial pool dimensions.

Extended Detection Range: The sensor offers a detection range up to 8 meters, providing ample forward warning for the cleaner to adjust its path smoothly.

Minimal Blind Zone: A remarkably small blind zone of ≤ 4 mm right in front of the transducer ensures that even nearby obstacles or subtle pool floor contours are detected, preventing missed collisions.

Value for Robotic Pool Cleaners
The integration of this sensor transforms a robotic cleaner's capabilities:

Precise Mapping & Navigation: Enables systematic coverage and efficient path planning by accurately measuring distances to pool boundaries.

Obstacle Avoidance: Detects and avoids ladders, drains, and floating toys, preventing entrapment and damage.

Enhanced Efficiency: Contributes to thorough cleaning by allowing the robot to operate closely along walls and corners without constant bumping.

Conclusion
This underwater ultrasonic sensor is a critical enabler for advanced robotic pool cleaners. By delivering accurate, real-time distance data in a compact and rugged package, it ensures these autonomous devices can navigate complex pool environments intelligently, reliably, and with greater operational efficiency.