Subject:
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Re: MAP Bot
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 22 Nov 1998 16:39:27 GMT
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Original-From:
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John Donaldson <(jdonaldson@)SayNoToSpam(ghg.net)>
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Viewed:
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2472 times
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Looking at the sensor inputs for the brick, I see they can be set to
RAW
BOOLEAN
PULSE
PERCENT
DEG F
DEG C
ROTATION ANGLE
I suppect ether the RAW or PULSE Modes would be usefull. The PULSE
Input would allow a FIX Range and the RAW would allow the BRICK to
determine Range.
I too have found sites for the Sonar Sensor. PAUL/BOB you may know
these site.
http://wirz.com/sonar/index.html - sonar
http://www.robotstore.com/sensors.html - sonar
http://www.acroname.com/robotics/parts/r15-sonar2.html - IR
www.vernier.com/probles/motion.html - sonar
Question 1: What is the best way to detect Motor Stall? Is it with the
Rotation Angle Sensor or is there a way to determine this from the Motor
Itself?
Question 2: What is the voltage range of the analog input to the
brick, such as for the light sensor??
John A. Donaldson
Paul Davis wrote:
>
> This is exactly what I wanted to attempt, I wonder how small those >units are
> now, would it be possible to modify a brick to hold the parts?
>
> -Paul-
Bob Wind wrote:
>
> I like your idea, John. I have an old Heathkit Hero Jr. robot
> that had a Polaroid sensor, and tried to do what you are
> describing. The sensor was mounted directly in the body,
> so the only way that I could scan was to turn the whole
> robot. When it turned, I couldn't get to accurately return
> its original direction. I thought of adding a rotatable sensor
> but I never did it because the sensors cost $50 to $75
> and I didn't want to cobble Hero by removing his internal
> one.
>
> A few months ago I found note on the web that old Polaroid
> 660 cameras have a sensor and drive circuit that is nearly
> identical to the expensive Polaroid 6500 sensor. They have
> the same signals, but with different connection points.
> Other web pages gave me the 6500 spec sheet and
> a description how to use the sensor with a Basic Stamp.
> Since that time I have bought two of these cameras for
> less than $5 each at a garage sale and a Goodwill store.
> I haven't used them yet.
>
> A Basic stamp can easily create pulse signals to control
> a radio control servo. Perhaps the camera sensor could be
> mounted to a radio control servo and be aimed and read by
> a Basic Stamp. The Stamp could communicate to the Lego
> RCX via a the infrared link since it can send and recieve serial
> data easily. It could could gate a 38kHZ oscillator that
> drives an infrared LED, and it could sense IR with a
> $3.50 receiver circuit from Radio Shack. Mount that
> stuff and a battery to a Lego base plate, and you'd have a
> nice ultrasonic ranging add-on for the RCX.
>
> Bob Wind
> rwind at gfn dot org
> ----------
> > From: John Donaldson <jdonaldson@ghg.net>
> > To: lego-robotics@crynwr.com
> > Subject: MAP Bot
> > Date: Saturday, November 21, 1998 5:34 AM
> >
> > I have a idea which is based on a project I worked on back in the
> > 70's. It used one of the sonar devices that Poliord used to foucse their
> > camera with. This device is availible without the camera. It sends a
> > signal based on how far the object is.
> > My idea is
> >
> > 1. 2 motors to run bot foward/back/right/left.
> > 2. 1 motor to rotate sonar right to left.
> >
> > A. The bot would move forward a few feet.
> > B. Stop then scan right to left with sonar.
> > C. if opening found set bit in memory map
> > D. if sonar detects dead end. turn bot 180 degs
> > E. move back to first opening.
> > F. if more than one opening, deceided which one to enter
> > G. Turn bot to enter opening.
> > H. goto A.
> >
> > With enough battery power, it could roam the house or office.
> >
> > John A. Donaldson
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