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Posted by Gordon McComb on October 18, 2006, 2:24 pm
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You might try this page:
http://www.dvanhorn.org/Barcode/
Dave has been selling his custom barcode decode chip for a while. You
may elect to just use custom UPC barcodes, which can be read
bidirectionally, and can be produced by a lot of free software. The chip
is responsible for sending out the proper digits, does the checksum,
etc.
-- Gordon
cadcoke3@yahoo.com wrote:
>
> I am talking about a project to add some more inteligence to the Roomba
> robotic vacuum.(the group isteh "hacking" part of
> http://www.roombareview.com/chat/ ).
>
> We want to a laser, and light sensor inside the Roomba and used it as a
> sensor to detect reflector targets that have barcodes on them. See
> these links for two sensor setups, but that don't try to detect bar
> codes' http://www.philohome.com/sensors/lasersensor.htm and
> http://www.rssc.org/newsletter/sep99.pdf
>
> The goal is to have the robot determine its absolute position by
> spinning in place, and timing the detection of the reflective targets.
> The barcode is to allow the robot to know which of the targets it has
> detected. I was thinking of a system that started with a single stripe
> of reflective tape, which was followed by a series of either more
> reflective tape, or a missing stripe of tape to indicate binary 0's and
> 1's.
>
> I see the scribbler robot has the ability to detect barcodes using its
> line-following sensors;
> http://www.scribblerrobot.com/dl/Resources/BarCodes-v1.0.pdf . I see
> that it uses a different system of encoding the digit. It does it by
> wide-strip vs. a thin-strip. It also has some other digits to
> determine which way the robot is scanning the code, but we won't need
> that, since we know the direction the robot will spin (clockwise)
>
> I have a few questions;
>
> Is there an advantage to the wide-strip / thin-strip system in our
> appication?
>
> Any other projects out there that use this sort of laser-sensor in a
> barcode system?
>
> Any more advice regarding our project? (you can put it on that web site
> if you wish)
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> I am talking about a project to add some more inteligence to the Roomba
> robotic vacuum.(the group isteh "hacking" part of
> http://www.roombareview.com/chat/ ).
>
> We want to a laser, and light sensor inside the Roomba and used it as a
> sensor to detect reflector targets that have barcodes on them. See
> these links for two sensor setups, but that don't try to detect bar
> codes' http://www.philohome.com/sensors/lasersensor.htm and
> http://www.rssc.org/newsletter/sep99.pdf
>
> The goal is to have the robot determine its absolute position by
> spinning in place, and timing the detection of the reflective targets.
> The barcode is to allow the robot to know which of the targets it has
> detected. I was thinking of a system that started with a single stripe
> of reflective tape, which was followed by a series of either more
> reflective tape, or a missing stripe of tape to indicate binary 0's and
> 1's.
>
> I see the scribbler robot has the ability to detect barcodes using its
> line-following sensors;
> http://www.scribblerrobot.com/dl/Resources/BarCodes-v1.0.pdf . I see
> that it uses a different system of encoding the digit. It does it by
> wide-strip vs. a thin-strip. It also has some other digits to
> determine which way the robot is scanning the code, but we won't need
> that, since we know the direction the robot will spin (clockwise)
>
> I have a few questions;
>
> Is there an advantage to the wide-strip / thin-strip system in our
> appication?
>
> Any other projects out there that use this sort of laser-sensor in a
> barcode system?
>
> Any more advice regarding our project? (you can put it on that web site
> if you wish)