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Using Multiple Ultrasonic Sensors

grondak

I'd like to build a robot with three sensors for left, front, and right distances.   I'd like to ensure that the output signal of one sensor doesn't get picked up by the others' receivers.  Any ideas here? A physical "horn" to ensure selective hearing (heh)?

 

Thanks!

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  • The easiest way to do it is to fire the sensors sequentially.

    You probably need to allow a time between sensors firing of at least 10 x transit time of the normal maximum detection distance. So if you can detect at 2m you need to allow 320/40 = 0.125 seconds between one sensor and the next sending pulses.

    (I do mean to divide by 40 in the example because the distance is to the target and back again.)

     

    MK

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  • The easiest way to do it is to fire the sensors sequentially.

    You probably need to allow a time between sensors firing of at least 10 x transit time of the normal maximum detection distance. So if you can detect at 2m you need to allow 320/40 = 0.125 seconds between one sensor and the next sending pulses.

    (I do mean to divide by 40 in the example because the distance is to the target and back again.)

     

    MK

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