Update: 2019-10-15 17:38 Source: LUFTMY
Aiming at the cleanliness function of sweeping robot, luftmy specially develops and produces the micro dust sensor S7 smart dust, which is installed in the ventilation duct of vacuum cleaner, sweeping robot and other equipment based on the principle of optical reflection. It can accurately measure the number and concentration of particles such as mite, dust, hair fiber, etc., and display the ground, carpet, bed sheet, sand in real time. Cleanliness data of dust in vehicle.
Application benefits of S7 Smart Dust sensor in vacuum cleaner and sweeping robot products: the cleaning effect of the equipment and the cleanliness of the floor, carpet, bed sheets, etc., are presented to the user visually through the output data of S7 clean particle sensor and LED color display; According to the data of dust recognition sensor, the machine can control the speed of the motor intelligently, so as to achieve mute energy saving and prolong the life of the motor.
Ultrasound is a kind of sound wave in a certain frequency range. It has the characteristic of propagating at a constant rate in the same medium. At the interface of different media, it will produce reflection phenomenon. Using this characteristic, we can measure the time interval between the transmitted wave and the reflected wave according to the measurement, so as to achieve the function of measuring distance.
In the sweeping robot, the realization of obstacle avoidance function is based on the principle of ultrasonic ranging. Its sensor part consists of three pairs (each pair includes a transmitting probe and a receiving probe) and six ultrasonic sensors.When the signal encounters an obstacle, it generates a reflected wave. When the reflected wave is received by the receiver, the distance of the obstacle can be accurately judged according to the principle of ranging mentioned above. At the same time, the size of the obstacle can also be preliminarily determined according to the magnitude of the signal.
Ultrasound sensor adopts direct reflection detection mode. The detected object in front of the sensor transmits the transmitted sound wave partially back to the receiver of the sensor, so that the sensor can detect the detected object, and judge the size, distance and general properties of the object in front through the processing of the single-chip microcomputer system.
Infrared ranging sensor detects the distance of obstacle by using the principle that the intensity of the reflection of the infrared signal encountering the distance of obstacle is different. Infrared ranging sensor has a pair of infrared signal emitting and receiving diodes. The transmitter transmits infrared signal of a specific frequency. The receiver receives infrared signal of this frequency. When the direction of infrared detection encounters obstacles, the infrared signal is reflected back and received by the receiver. After processing, the infrared return signal can be used to identify changes in the surrounding environment.
Contact thickness sensor usually uses inductive displacement sensor, capacitive displacement sensor, potentiometer displacement sensor and Hall displacement sensor to measure contact thickness. In order to continuously measure the thickness of moving objects, rolling contacts are often installed on the movable ends of displacement sensors to reduce wear. Contact thickness sensor can measure object height and space size. The omnipotent cleaning robot can use this to detect the height of obstacles and make further judgments to play its role.
The shell of the turbidity sensor is fixed in the body of the test box, and the infrared light emitting diode with a certain wavelength is used as the detection light source to penetrate the tested solution, and the transmitted light intensity is detected to detect the degree of the turbidity of the solution. Infrared light emitted by an infrared light emitting diode penetrates the medium of the solution under test, and is accepted by a phototransistor at the receiving end to generate photocurrent. The photocurrent of phototransistors varies approximately linearly due to the different media, particle size and density of dust in the solution. After filtering, the detection signal related to turbidity can be obtained.
Due to various factors, the sweeping robot will inevitably collide with obstacles. In order to deal with this situation, we use photoelectric switch sensors to sense the collision of the car body and the approximate position of the collision, so that the sweeping robot can make corresponding decisions.
A collision plate of about 180 degrees is designed at the front end of the sweeping robot, and a photoelectric switch is installed on both sides of the collision plate. The photoelectric switch consists of a pair of infrared emission pairs. The infrared light emitted by the light emitting diode is received by the photosensitive diode through a special hole in the fuselage of the sweeping robot. When the fuselage collision plate is collided, the collision plate will block the special hole in the fuselage and hinder the acceptance of the infrared ray so as to convey information to the control system.
In order to prevent the sweeping robot from falling when it meets the steps, 3 anti-falling sensors are installed on the back of the sweeping robot. The fall-proof sensor also USES ultrasonic for ranging. When the sweeping robot moves to the edge of the steps, the anti-falling sensor USES ultrasonic wave to measure the distance between the sweeping robot and the ground. When the limit value is exceeded, a signal is sent to the controller, and the controller controls the sweeping robot to turn and change the forward direction of the sweeping robot, so as to realize the purpose of preventing falling.