Details where ultrasonic obstacle avoidance sensors are used

In recent years, with the development of mobile robots, unmanned vehicles and drones, the demand for obstacle avoidance ultrasonic sensors has increased. Traditional ultrasonic sensors that can be used to avoid obstacles include millimeter wave radar, lidar, binocular vision sensors, ultrasonic sensors, infrared rangefinders, laser rangefinders, photoelectric diffuse reflection sensors, vision sensors, and so on. I will use this article to find out where the ultrasonic obstacle avoidance sensor is used.

Principle of ultrasonic obstacle avoidance sensor.Ultrasound is actually a kind of sound wave. Because the frequency is higher than 20kHz, it is inaudible to human ears and has stronger directivity. 

The principle of ultrasonic ranging sensor is simpler than infrared, because sound waves will be reflected when it is encountering obstacles, and the speed of sound waves is known, so you only need to know the time difference between transmission and reception, you can easily calculate the measuring distance, and then combine the transmitter and receiver The actual distance of the obstacle can be calculated as shown in the figure below. 

Ultrasonic ranging sensor is cheaper than infrared ranging, and the corresponding sensing speed and accuracy are also inferior. Similarly, due to the need to actively emit sound waves, for obstacles that are too far away, the accuracy will also decrease with the attenuation of sound waves. In addition, ultrasonic waves will not work for objects that absorb sound waves such as sponges or under strong wind interference. The two ultrasonic obstacle avoidance sensors provided ,which can be well applied to the fields of robots, unmanned vehicles and drones.

They are ultrasonic obstacle avoidance sensor. The ultrasonic obstacle avoidance sensor is a high-resolution, high-precision, low-power ultrasonic sensor. It is designed not only to deal with interference noise, but also anti-noise interference ability. And for targets of different sizes and varying supply voltages, sensitivity compensation has been made. It also has standard internal temperature compensation, which makes the measuring distance data more accurate. Used in indoor environment, it is a very good low-cost solution! The ultrasonic obstacle avoidance sensor module is a distance measurement module based on a transceiver integrated ultrasonic sensor. By measuring the flight time of ultrasonic waves from transmission to reception, the module can detect objects within 3 meters and output distance signals through the UART interface. This product has the characteristics of high sensitivity, fast response speed, good anti-interference performance and stability, and is widely used in obstacle avoidance systems of various robots, drones and smart devices. Let's learn more about the application solutions of ultrasonic obstacle avoidance sensors

Application of ultrasonic obstacle avoidance sensor in UAV use various sensing technologies to achieve autonomous navigation and collision detection. As the functions of drones continue to increase obstacle avoidance technology, as a guarantee for increasing the safe flight of drones, also changes with the development of technology. "Obstacle avoidance function" as a UAV in the flight process, collects information about the surrounding environment through its ultrasonic sensors, measuring the distance to make corresponding action instructions, so as to achieve the function of "obstacle avoidance", which brings the most direct benefits That is, some collisions caused by human negligence in the past can now be avoided through the obstacle avoidance function, which not only guarantees the safety of drones, but also avoids damage to the surrounding personnel and property, so that the threshold for flying drones is further improved. 

Application of Ultrasonic Obstacle Avoidance Sensor Robot autonomous positioning and navigation is simple, but it needs to be based on the combination of map data + algorithm to achieve real automatic automatic navigation. The ultrasonic sensor used in the robot is an electronic module, and the measuring distance is between 3cm and 400cm. It can be used to help robots avoid obstacles, or for distance measurement and obstacle avoidance projects in other related projects. compact ultrasonic sensor can be said to be used to detect the working status of the robot itself, and the core component of the robot to intelligently detect the external working environment and object status. Not only can you feel the prescribed measured, but also can be converted into a device or device that can be used to output signals according to certain rules. Due to the strong directivity of ultrasonic waves and the long distance it travels in the medium, ultrasonic waves are often used for distance measurement, such as rangefinders and level measuring instruments, etc., which can all be realized by ultrasonic waves. Ultrasonic detection is often quick, convenient, simple to calculate, easy to achieve real-time control, and can meet industrial practical requirements in terms of measurement accuracy, so it has also been widely used in the development of mobile robots.

The application of ultrasonic obstacle avoidance sensor in AGV.In recent years, with the continuous increase in logistics and handling market demand and labor costs, the expansion of factory scale, the innovation of management models, work efficiency and cost control and many other factors, the functions and systems of AGV products need to further quickly meet customers' high adaptation to products. Sexual needs. For the complex factory environment, whether it is manual operation or machine operation, safety is an issue that cannot be ignored. According to the application of AGV trolley in the factory, the AGV trolley obstacle avoidance system is directly related to the safety of the AGV trolley during operation. Therefore, obstacle detection is a basic problem in the research of automatic navigation vehicles and a prerequisite for safe and normal operation.

As far as obstacle avoidance is concerned, AGV industry is the primary consideration. AGV collision avoidance and obstacle avoidance can be divided into two types of designs: one is contact design, which plays a role of anti-collision protection. Commonly used contact sensors (such as piezoelectric sensors, mechanical switches) Etc.) Installed at the bottom of the car body to detect peripheral non-contact sensors (infrared, ultrasonic, laser, etc.) to detect dead corners and play a role in buffer protection; the second is non-contact design, which plays a role in avoiding obstacles. Non-contact sensors are commonly installed The slightly higher front and rear parts of the car body are used to avoid obstacles when the vehicle is moving forward or backward.

Ultrasonic distance sensor is widely used in AGV obstacle avoidance detection due to their low price, high ranging accuracy, stable measurement, and small size. In anti-collision applications, the principle of anti-collision of ultrasonic sensors is to use the characteristics of ultrasonic waves that can reflect when encountering obstacles. According to the round-trip time of ultrasonic transmission and reception and the speed of sound, the distance to the obstacle is detected to prevent collision with obstacles. Because the beams emitted by the ultrasonic wave are launched in a certain range, the ultrasonic anti-collision makes up for the shortcomings of the laser anti-collision only horizontal plane anti-collision, making the laser trackless navigation forklift more comprehensive and safer. Since the speed of ultrasonic waves in the air is related to temperature and humidity, in a more accurate measurement, changes in temperature and humidity and other factors need to be taken into consideration.