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'[OT]: INFO about my little robot!!( was Robotics '
2000\12\13@124229 by rchock, Steve

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Friends:

Here is some preliminary information om my little robot. I must admit,
there have been some good conversations about this topic and I have learned
alot!!!! Soon I will have this done,..... which means soon I'll be repairing
what damage my 3 year old son does. His mother keeps telling me that she
thinks I enjoy
playing with it more than he will, and she's probably right!! :-) I still
have to finish
some code as well as painting it and putting graphics on it, but 80%
completed!!

http://www.geocities.com/ResearchTriangle/Lab/6584/x_bot_home.html

Please let me know of your suggestions/opinions!!

Thanks again guys!!!

Steve


Steven Kosmerchock
Radio Frequency Systems
Phoenix,  Arizona  USA
(WORK) http://www.rfsamericas.com

http://www.geocities.com/researchtriangle/lab/6584

"Great spirits have always encountered violent
oppposition from mediocre minds."--A.Einstein

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2000\12\14@121916 by Dan Michaels

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Roman Black wrote:
........
>
>I think something like this will work, if I'm guessing right
>you are using the opto sensors made for receiving infra red
>remote signals? These are tuned for a specific frequency.
>

No, the QSE156QT's do not have a BP filter, so they are more
flexible, altough a little less sensitive. So you can take
the data raw or add your own filter, or do both - as I
have previously:

QSE-------+--------------->raw
 (0-5v)  |
         +----|>|---+-+-->filtered
                    R C
                    | |
                    gnd
============

>Also you will find that reflectiveness of infra red varies
>greatly with color of the surface, can vary 10:1 with matt
>black to shiny white. This is often more variance than the
>useful range.

Yes, this is why I want to be able to control the output energy
of both IR LED and ultrasonic xmtr. Varying energy will help get
some feedback about different reflectances and distances. To do
this, all I need is a way to convert pulse-widths to voltage, ie
variation of PWM -> RC filter = analog. Use this to power LED/USxmtr.
==================

>
>These sensors can be good for floor detectors (sumo?) so
>bot doesn't fall off the table.
>

Ha, only you want to run your bots up on shelves in the
pantry.
===============

>For range detecting I suggest the Sharp module that
>is good for 10cm to 100cm, with serial output. Or some
>tricky aperture/angle with two sensors can give ranging.

My experience is IR bounces well off of just about anything
[you can point your TV remote away from the TV and can still
channel surf via the bounce], so I don't think aperture is
the biggest issue here. For good IR ranging, probably
control over LED output energy is more important. This is
my gut talking.
============

>PS. The module you have has internal ac amp, so even using
>narrow pulse width will still give a good detection. Maybe
>reduce led current??
>

Yes, as described above.

best regards,
- Dan Michaels
Oricom Technologies
http://www.oricomtech.com
=========================

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2000\12\15@031320 by Roman Black

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Dan Michaels wrote:

> No, the QSE156QT's do not have a BP filter, so they are more
> flexible, altough a little less sensitive. So you can take
> the data raw or add your own filter, or do both - as I
> have previously:

OK, I missed the BP filter thing. :o)


{Quote hidden}

Yep, we fix/test remotes constantly. The problem is that
with a remote with a 30 foot direct range, it will work
ok when bounced off the ceiling which it matte white at
about 90% reflective. Not so with a 5 foot range device
bounced off a black surface, might only get a few inches.

The way to get decent ranging is to use a lens (or aperture)
and TWO receiver diodes. One rec acts as a "control" and
you use it to adjust gain (for dark surfaces). The other
receiver is placed behind the lens in a way that it's gain
is affected greatly by distance from the surface, by
parallax error, so that between the two receivers you can
calc a reliable distance reading. It helps a lot if the
transmitter is a thin beam, again another aperture or
lens (or infra-red laser).

Or alternatively, you can buy the sharp unit for about
$12 US that does all of the above and even outputs serial
data via one pin. :o)
-Roman

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2000\12\15@033807 by Dan Michaels

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Roman wrote:
.......
>The way to get decent ranging is to use a lens (or aperture)
>and TWO receiver diodes. One rec acts as a "control" and
>you use it to adjust gain (for dark surfaces). The other
>receiver is placed behind the lens in a way that it's gain
>is affected greatly by distance from the surface, by
>parallax error, so that between the two receivers you can
>calc a reliable distance reading. It helps a lot if the
>transmitter is a thin beam, again another aperture or
>lens (or infra-red laser).
>

Awww man, now the bots gotta be industrial-strength too?
Hey, it's just a cheap AOL CDROM on wheels. Really.
Actually, I'm not too sure about IR distance sensors,
anyways, but eveybody has one, so .....

I figure the bumpers and ultrasonics will be more fun.
===================

>Or alternatively, you can buy the sharp unit for about
>$12 US that does all of the above and even outputs serial
>data via one pin. :o)

[what! the whole bot doesn't cost $12]. Hmmm, how to use
one IR sensor for distance ranging, backgnd illumination
measuring, TV remote pickup, blinking hello, talking
IrDA to a Palm pilot, sensing homing beacons, and navigation
measurements on the moon and the sun ..... and only use 5
components besides. Not so hard.

goodnite,
- danM

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2000\12\15@080101 by rchock, Steve

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Dan:

To be honest, I had those sensors on hand. I may be modifying it,
I spent all day Thursday at home working on it. I honestly don't
believe it will be ready in time. I will look into using a different way of
sensing objects. I just wanted a way to tell the robot,"hey there is
something in front
of me", then do this. Nothing too complicated yet.

Steve


Steven Kosmerchock
Radio Frequency Systems
Phoenix,  Arizona  USA
(WORK) http://www.rfsamericas.com

http://www.geocities.com/researchtriangle/lab/6584

"Great spirits have always encountered violent
oppposition from mediocre minds."--A.Einstein

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