How Pressure Sensors & Smart Algorithms Detect Edges on Frameless Glass: The Tech Behind W5600X

For owners of modern homes with floor-to-ceiling glass balconies or frameless shower doors, the biggest fear of using a window cleaning robot is the "cliff" — the edge where the glass ends.

While traditional robots rely on physical bumpers, the upgraded Frewico W5600X uses a sophisticated combination of High-Sensitivity Pressure Sensors and AI-driven Algorithms. Here is a deep dive into how it works.

1. The Physics of Vacuum Pressure Monitoring

The W5600X stays attached to the glass by creating a vacuum seal with its 5600Pa suction motor. The internal Pressure Sensors act as the robot's "inner ear," constantly measuring the air pressure levels within the suction chamber thousands of times per second.

As the robot moves, the algorithm monitors for any Pressure Drop.

2. Edge Detection via the "Air Leak" Principle

When a wheel or a portion of the suction seal begins to cross the edge of a frameless glass pane, a tiny amount of air begins to leak into the vacuum chamber.

• The Instant Trigger: Even before the robot physically hangs over the edge, the Pressure Sensors detect this microscopic drop in vacuum seal.

• Algorithm Response: The onboard AI processes this "Leak Signal" in milliseconds. It interprets this not as a malfunction, but as a "Boundary Signal."

3. The AI Pivot: Precise Path Correction

Once the algorithm confirms an edge has been reached, it immediately commands the drive motors to:

1. Stop Forward Motion: To prevent any further overstepping.

2. Increase Suction Power: Temporarily boosting the motor to 5600Pa to ensure a rock-solid grip during the turn.

3. Calculate New Path: The robot pivots and maneuvers back into the "Safe Zone," continuing its Z or N-shaped cleaning pattern without ever losing its seal.

4. Why Pressure Sensors are Better than Optical Sensors

Many older robots use infrared or optical sensors to "see" the edge. However, optical sensors can be fooled by:

• Strong Sunlight: Blinding the sensors.

• Transparent Corners: Difficulty distinguishing between glass and air.

• Dust on Sensors: Causing false readings.

Pressure-based sensing is much more reliable because it relies on the physical reality of the vacuum seal, making the W5600X significantly safer for high-altitude, frameless environments.

Technical Summary for Tech Enthusiasts

• Sensor Type: High-Precision Air Pressure Differential Sensor.

• Response Time: < 0.2 seconds.

• Suction Safety Margin: 5600Pa (optimized for leak compensation).

• Surface Compatibility: Frameless Glass, Slanted Skylights, and Large Mirrors.