Subject:
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RE: Ultrasound Range-Finding
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 15 Apr 1996 21:36:41 GMT
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Original-From:
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Chuck McManis <cmcmanis@IHATESPAMnetcom.com>
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Viewed:
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1947 times
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Sean wrote:
> Don't most IR sensors have a limited useful range, though? I understood
> that it was difficult to get more than 2-3 inches from an IR sensor - can
> they be made long-range sensitive?
The IR sensors on the robot I built have an effective range of about 4 feet.
The "downside" of IR sensors are that they are much more difficult to scale
in terms of distance.
I used a PIC chip to do both illumination and error elimination and that makes
them much more reliable than just using say the Sharp ISU60's by themselves.
The code for this is on cher in /pub/incoming/cmcmanis I believe. Since the
detectors de-rate based on how far off their center frequency you are there
total range can be controlled in a gross way by modulation. When I initially
built my IR circuit I put 100mA through the IR LEDs and was getting returns
on white walls 10' away which was too far.
--Chuck
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From: Sean Cunningham[SMTP:sean@alice.msiconsulting.com]
Sent: Monday, April 15, 1996 12:22 PM
To: Chuck McManis
Cc: handyboard@media.mit.edu
Subject: RE: Ultrasound Range-Finding
At 12:13 PM 4/15/96 -0700, you wrote:
> > I have my Polaroid Sonar connected and running. It seems to work
> > perfectly. There is no additional circuitry required. In fact it works
> > so well, I am probably not going to install the IR system, at this time.
>
> For which I have only one comment, "Curtains". Yes, IR can see curtains,
> ultrasonics cannot.
Don't most IR sensors have a limited useful range, though? I understood
that it was difficult to get more than 2-3 inches from an IR sensor - can
they be made long-range sensitive?
Sean R. Cunningham
MSI Consulting Group
http://www.msiconsulting.com/
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