Subject:
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Re: Ultrasonic Sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 17 Jan 2004 19:38:21 GMT
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Viewed:
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1066 times
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Ismael Salvador wrote:
> Hi all, I recently got an ultrasonic sensor from MindSensors, the problem is
> that I don't have a stable value and they overlap with different distances.
> Nitin suggested me to use alkaline batteries rather than rechargeable ones.
That suggestion makes no sense at all given what your problem is. The
voltage and current to the sensors is regulated by the electronics in
the RCX, and is not governed directly by the type of battery that you
are using. This would only make sense if the sensor itself had its own
internal battery.
> I have done it with both types and the result is nearly the same.
I have not personally tried this particular sensor, but I don't find
this very suprising. Ultrasonic detection is not very precise without
extremely sensitive and expensive equipment (unless you are a bat). If
you want a little more precise distance detection, I recommend using
modulated IR and measuring that. If you want very precise distance
detection, you may have to spend top dollar. Sorry.
>> Mark
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Message has 1 Reply:
 | | Re: Ultrasonic Sensor
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| (...) In my experience, the loss of "headroom" when using rechargeable batteries can cause serious problems for active sensors. They run from a current limited copy of the battery voltage when in the power phase of the active sensor interface mode. (...) (21 years ago, 18-Jan-04, to lugnet.robotics)
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Message is in Reply To:
| | Ultrasonic Sensor
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| Hi all, I recently got an ultrasonic sensor from MindSensors, the problem is that I don't have a stable value and they overlap with different distances. Nitin suggested me to use alkaline batteries rather than rechargeable ones. I have done it with (...) (21 years ago, 17-Jan-04, to lugnet.robotics)
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