Most of the new robot vacuum cleaners use cliff sensors to prevent the devices from falling down stairs. The sensors work too well. When the robots approach black bordered rugs, the robots won't climb on to the rug or carpet to clean because the darkness appears to be like falling into an abyss.Many YouTube videos show the solution to the problem. Users can place aluminum foil over the cliff sensors and hold the tape in place with duct tape. If the users have houses that are all on one level, the problem is solved. If the robots are used in multi-story houses, virtual wall barriers can be set near stairs to stop the robots from going over the edge.
You would think that after 13 years of existence that iRobot would have a way to disable the sensors rather than have users apply foil and tape to the expensive devices.
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