Obstacle AvoidanceΒΆ

In this project, picrawler will use an ultrasonic module to detect obstacles in front. When PiCrawler detects an obstacle, it will send a signal and look for another direction to move forward.




  • You can write the program according to the following picture, please refer to the tutorial: How to Create a New Project?.

  • Or find the code with the same name on the Examples page of the EzBlock Studio and click Run or Edit directly.


How it works?

You can find the following blocks in the Module category to achieve distance detection:


It should be noted that the two pins of the block should correspond to the actual wiring, that is, trig-D2, echo-D3.

Here is the main program.

  • Read the distance detected by ultrasonic module and filter out the values less than 0 (When the ultrasonic module is too far from the obstacle or cannot read the data correctly, distance<0 will appear).

  • When the distance is less than alert_distance (the threshold value set earlier, which is 10), play the sound effect sign.wav. PiCrawler does turn left .

  • When the distance is greater than alert_distance, PiCrawler will move forward.