How is object avoidance possible using only one Sonar?

Hi, we plan to use maxbotrix sonar EZ4 for obstacle avoidance with ardupilot. However, if I2C connection is only available for the connection of 1 Sonar (since there is only one I2C port for the same sensor(s) with the same address), how is the object avoidance going to work with only one direction of obstacle detection, since the quadcopter can possibly fly in all directions?

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