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10. Ultrasonic

In this project, you will learn how to read the distance detected by the ultrasonic module.

How to do?

  1. The ESP32-CAM and the Arduino board share the same RX (receive) and TX (transmit) pins. So, when you’re uploading code, you’ll need to first disconnect the ESP32-CAM to avoid any conflicts or potential issues.

  2. Open the 10_ultrasonic.ino file under the path of zeus-car-main\examples\10_ultrasonic.

  3. After the code is uploaded successfully, slide the power switch to ON to start the Zeus Car.


    Do not unplug the USB in this step, because you need to check the data of the Ultrasonic module on your computer.

  4. Open the serial monitor and make sure the current baud rate is set to 115200. It is recommended to click on the Toggle Autoscroll icon so that you can see the latest printed data.

    • You can view the printed data like distance: 21.11  is_obstacle: 0.

    • If the distance of the obstacle ahead is within 20cm, is_obstacle: 0 will become is_obstacle: 1.