Using Multiple Ultrasonic Sensors

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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michaelkellett over 6 years ago +2

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…
dougw over 6 years ago +2

As Michael indicates, this is normally handled with sequential activation. This slows response time so sometimes it is not ideal. Best speed is achieved by using the return from one sensor to trigger the…
grondak over 6 years ago in reply to dougw +2

Many of the ultrasonic sensors that are easy to buy have a single circuit board with a transceiver pair. I searched online for a simple way to change the frequency on such boards but didn't find one right…

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michaelkellett over 6 years ago

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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grondak over 6 years ago in reply to michaelkellett

Thanks for the 10x figure, michaelkellett!
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grondak over 6 years ago in reply to michaelkellett

Thanks for the 10x figure, michaelkellett!
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