TJ-56-687Ultrasonic Automatic Obstacle Avoidance Intelligent Car DIY Kit. The car automatically advances, and when the sensor senses an obstacle in front, it automatically turns left or right, or even directly reverses to avoid the obstacle and continue moving forward. The sensing distance of ultrasound can be reset by pressing the button. [Operational Principle] The ultrasonic obstacle avoidance system is based on the reflection of acoustic waves when encountering obstacles. The ultrasonic sensor measures the time difference between transmitted and received ultrasonic waves to calculate the distance between the obstacle and the sensor. By monitoring changes in this distance, the system achieves automatic obstacle avoidance functionality., Weight: 0.27998707274 Pounds, Manufacturer: Blisfulhoks