Cleaning sensors of the robot vacuum cleaner Xiaomi: a detailed guide

Modern robot vacuum cleaners from Xiaomi and the Mijia ecosystem are complex navigation systems that rely on the accuracy of multiple sensors. Dust, pet hair and small debris inevitably settle on the surface of the optics, which over time leads to positioning errors, chaotic movement or complete failure of cleaning. Owners often face a situation where the device begins to “blind”, stumble on obstacles or fall from stairs, unaware that the cause lies in the banal pollution.

Regular maintenance of optical components is not just a recommendation, but a necessity for maintaining intelligent navigation. Ignoring the purity of sensors can lead to false readings of the height of obstacles, which will cause the robot to get stuck under the sofas where it used to rode freely. In this guide, we will discuss which sensors require attention, how to clean them safely and what errors should not be allowed during maintenance.

Cleaning sensors can return the device to the factory accuracy of maps and routes without going to the service center. It is important to understand that different models, whether it is Xiaomi Vacuum Mop 2 Pro or older versions of Roborock, have their own features of the location of the sensors, but the principles of care for them are universal.

Classification of sensors and their location on the body

To clean effectively, you need to clearly understand which sensors are installed on your device and what they are responsible for. Most Xiaomi models are equipped with a set of sensors, including lidar, optical floor sensors (Cliff), bumper sensors and wall sensors. Lidar, located in a characteristic cylinder on the top of the body, builds a map of the room, while lower sensors monitor the changes in altitude and prevent falling.

Special attention should be paid to optical elevation sensors, often called Cliff sensors, located on the bottom of the device, usually closer to the front wheel, and are small windows of dark plastic, which are most often hit by dust raised by the brush, creating the illusion of a surface cliff, which may cause the robot to refuse to go forward or start to spin randomly in place.

Collision sensors and wall sensors around the bumper perimeter are also important, allowing the device to gently touch the furniture and navigate along the walls, and the contamination of these elements causes the robot to stop "feeling" the walls or, conversely, to think that it has hit an obstacle even though it is empty in front of it. Understanding the location of each element is critical for proper diagnosis of problems.

• 🔴 LiDAR (Laser rangefinder): Located in the top cylinder, responsible for map construction and navigation.
• 🔵 Cliff sensors: located at the bottom, prevent falling from stairs and rapids.
• 🟢 Wall sensors: They are on the side of the bumper, help to move parallel to the walls.
• 🟡 Optical floor sensors: Used to track movements on carpets and dark surfaces.

⚠️ Warning: Never use abrasive cleaning products or rough fabrics when wiping lenses. Scratches on lidar optics or lower sensors can cause irreversible data distortion and navigation system breakdown.

Necessary tools and preparation for cleaning

Before you start servicing a robot vacuum cleaner, you need to properly prepare the workplace and tools. You don't need complex equipment to clean the sensors properly, but using the wrong materials can do more harm than the dust itself. The main task is to remove the contamination without damaging the sensitive surface of the lenses and driving moisture inside the housing.

You will need a soft, lilaless fabric, perfect for wiping glasses or smartphone screens. Using paper wipes or waffle towels is not recommended, as they can leave microscopic villi or scratches on the plastic. To remove persistent contaminants, you can slightly moisten the fabric with distilled water or a special spray for optics, but in no case pour liquid directly onto the device.

You may also need a compressed air can to blow out hard-to-reach areas around the sensors. It is important that the jet is not too powerful and angled so as not to damage the internal machinery. Before any work begins, the device must be completely turned off and, if possible, remove the battery or turn off its plume, although for surface cleaning it is enough to simply turn off the power button.

Step-by-step: Cleaning the lower sensors (Cliff)

The lower elevation sensors are the most vulnerable to contamination, as they are in close proximity to the suction hole and brushes. To access them, flip the Xiaomi robot vacuum cleaner upside down, putting it on a soft surface so as not to scratch the lid. You will see several dark windows, usually three to six, located around the perimeter of the bottom panel.

Gently wipe each window with a dry, lilaless napkin in circular motions. If you notice any sticky dirt or traces of detergent that may have splashed during wet cleaning, slightly moisten the cloth corner. The floor sensors should be perfectly clean and transparent; any plaque can block the infrared signal sent to the floor to measure distance.

After dry cleaning, blow the area around the sensors with compressed air to remove dust that has clogged into the gaps between the plastic case and the lens. Pay special attention to the central optical sensor (if your model has one), which is often used to track movement along the floor. Pollution of this element leads to the fact that the robot is “lost” and can not understand whether he has already passed this area.

After cleaning is complete, let the device lie down for 5-10 minutes to make sure that the moisture is completely evaporated if you have used a wet cloth. Only then can the robot vacuum cleaner be turned over and turned on. Regularly checking these areas should become a habit, especially if you have animals whose coat quickly accumulates in the lower part of the case.

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To clean hard-to-reach corners around the sensors, use a soft cosmetic brush, removing all the pile from it, which will help to wipe dust from the joints where the napkin will not get.

Maintenance of the LiDAR laser module and side sensors

The LiDAR laser module is the eyes of your robot, and its purity directly affects the quality of the map. There's a small transparent window on the top turret that the laser rotates through, and over time, it gets a thin layer of dust that scatters the beam and creates "noise" on the map in the Mijia or Xiaomi Home app. Rub this window very delicately, trying not to push the turret so as not to knock down the engine calibration.

The side sensors that detect the walls are located on the bumper ends, and they also need to be wiped periodically, especially if you notice that the robot has started hitting furniture more often or losing parallelity along the walls, and the dirt on these sensors can make the robot think that it has already hit an obstacle and will try to turn around ahead of time.

In some advanced models, such as the Xiaomi Robot Vacuum X10+, additional cameras are used or 3D-And you need to be even more careful about these things, and if you see a stain on the camera's lens, use a special tool to clean the optics, but apply it exclusively to the fabric, not the sensor itself.

⚠️ Warning: When cleaning a LiDAR turret, never force it to rotate with your hands and do not attempt to remove the protective plastic glass.This can disrupt the balancing of the mechanism and lead to an error "Laser sensor is blocked".

Diagnosing problems after cleaning

Once you've done all the sensor maintenance, you need to check if the problem is solved, and you need to put the robot vacuum cleaner in cleaning mode and watch it move in the first minutes of operation, and if the device is confidently leaving the base, building a route without random turns, and not trying to "fall" from a flat floor, then the cleaning of the sensors was successful.

You can see the cleaning history and map on the Xiaomi Home app. If you've lost any extra "walls" or areas where the robot could not drive before, that's a good sign. However, if the problems persist, maybe the pollution wasn't the only factor, or one of the sensors physically failed, and in such cases, it's worth checking if the sensors are taped with tape or protective film that you forgot to remove when you bought it.

Sometimes, after cleaning, you need to restart the system, press the buttons on the body simultaneously (the combination depends on the model, often it is the power button and the return button to the base) for 5-10 seconds before the sound signal, which will allow the microcontroller to re-interview all the sensors and reset the accumulated calibration errors.

Prevention and frequency of service

To keep your Xiaomi Robot Vacuum long and efficient, it is important to maintain regular maintenance. Don't wait for the robot to start giving out errors by voice-over that "Cliff sensor is contaminated." Preventive cleaning takes only a few minutes, but saves you from a lot of navigation problems. In pet homes, the frequency of procedures should be doubled.

Also, if you live in a high-dust area or close to a busy road, the dust will settle faster, and in such cases, visual inspection of the sensors should be done before every second cleaning, and regular maintenance extends the life of not only the sensors, but also the battery, since the robot spends less energy on repeat drives and finding ways.

Remember, optical sensors are most sensitive to the greasy spots that can remain after wet cleaning or if the robot has driven into a puddle of spilled soup. Such contamination with a conventional dry cloth cannot be removed - be sure to use a slightly damp microfiber wipe. The fat film completely blocks infrared radiation, making the sensor "blind."

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Cleaning sensors regularly is the easiest way to prevent 90% of navigation and mapping problems without going to a service center.