Sonar

Hardware

• Metro ESP32-S2 MCU
• Grove Board
• Sonar
• RGB led

Obstacle Detection using a Sonar

Write a program that compute the distance (in cm) to an obstacle in front of the sonar. If no obstacle is in front, the program does nothing. Use the plotter tool to display a graph.

RGB LED to Report Obstacles

Use an RGB blinking LED to signal obstacles. The LED status should be:

• green = no obstacle
• blinking yellow = obstacle but far enough (you should find the right distance)
• red = close obstacle