programming LEDs in an XY matrix

Archiver

hello everyone,

thanks to your input, i was able get my 49 LEDs working, via a double sided
printed circuit configuring the LEDs in an XY matrix, with the MAX7219 led
driver.

now, i need to know how to program the stamp to control them.

i know theoretically how to do this using the matrix, but don't know the syntax
of the stamp (as this is my very first attempt at programming for it). if anyone

has done anything similar, maybe you can offer some advice/code?

the leds are in a 7x7 square, and i need to be able to make them run a
'psuedo random' on/off shift register pattern (i.e. each LED is either on or
off,
somewhat randomly). the pattern would preferably run from top to bottom- so
one row would be, say, 0110101, and that sequence would move down the
rows until it got to the end, then drop off. each sequence would be
continuously followed by different sequences after it, running down in the
same way.

any tips?

i also need to make all the LEDs glow 'analog' from dim to bright at a
repetitive speed. that would be for a different part of the program, though, so
obviously doesn't need to happen at the same time as the above shift register
sequence.

curse me and my long inquiries... [noparse]:)[/noparse]



heather

Archiver

Tips? Read the manual! [noparse];)[/noparse] Okay, it's a bit dry, but we have lots of
free downloads: books from our Educator's series, Nuts & Volts reprints
... the training material you need to turn your theory into real work is
available.

-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office

---

Original Message

---

From: myamygdala [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JjwwIyP-Kv55Bthv6ilUy5o8he7yQ_Hnz0pwry-GfxJUr7ZeWINZqRwbwtaeG4nh560dys3XjG17DzxD]myamygdala@y...[/url
Sent: Sunday, April 04, 2004 2:43 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] programming LEDs in an XY matrix


hello everyone,

thanks to your input, i was able get my 49 LEDs working, via a double
sided
printed circuit configuring the LEDs in an XY matrix, with the MAX7219
led
driver.

now, i need to know how to program the stamp to control them.

i know theoretically how to do this using the matrix, but don't know the
syntax
of the stamp (as this is my very first attempt at programming for it).
if anyone
has done anything similar, maybe you can offer some advice/code?

the leds are in a 7x7 square, and i need to be able to make them run a
'psuedo random' on/off shift register pattern (i.e. each LED is either
on or off,
somewhat randomly). the pattern would preferably run from top to bottom-
so
one row would be, say, 0110101, and that sequence would move down the
rows until it got to the end, then drop off. each sequence would be
continuously followed by different sequences after it, running down in
the
same way.

any tips?

i also need to make all the LEDs glow 'analog' from dim to bright at a
repetitive speed. that would be for a different part of the program,
though, so
obviously doesn't need to happen at the same time as the above shift
register
sequence.

curse me and my long inquiries... [noparse]:)[/noparse]



heather

Archiver

Hi Heather,

Start with the Parallax application kit for the max7219

http://www.parallax.com/dl/docs/prod/appkit/max7298leddisplaydvr.pdf

Read the documentation about how to set up the hardware and the mode registers.

On the Stamp, you will become familiar with the SHIFTOUT command. For example,
SHIFTOUT 0,1,[noparse][[/noparse]$0357\]
PULSOUT 2,4 ' load it

would set the pattern in row 3 to $57 = %01011110.

You can break the data into two separate variables, a line number and
a pattern.
DO
I=5
RANDOM pattern ' make pattern
SHIFTOUT 0,1,[noparse][[/noparse]I, pattern]
PULSOUT 2,4 ' load it
PAUSE 100
LOOP

Also look at array table to hold seven patterns that will shift:

pattern var byte(7) array of 7 patterns

DO
J=J+8//7 ' location pointer
RANDOM pattern(J) ' new pattern at Jth location
FOR I=0 TO 6
SHIFTOUT 0,1,[noparse][[/noparse]I, pattern(J+I//7)] ' start new one at top
PULSOUT 2,4 ' load it
NEXT
PAUSE 100
LOOP

The // operator is modular arithmetic on the Stamp, and allows the
location pointer to move around the circular table modulo 7.

I hope that helps get you started with the Stamp. (Those are not
working examples, just snippets!)

-- Tracy



>hello everyone,
>
>thanks to your input, i was able get my 49 LEDs working, via a double sided
>printed circuit configuring the LEDs in an XY matrix, with the MAX7219 led
>driver.
>
>now, i need to know how to program the stamp to control them.
>
>i know theoretically how to do this using the matrix, but don't know
>the syntax
>of the stamp (as this is my very first attempt at programming for
>it). if anyone
>has done anything similar, maybe you can offer some advice/code?
>
>the leds are in a 7x7 square, and i need to be able to make them run a
>'psuedo random' on/off shift register pattern (i.e. each LED is
>either on or off,
>somewhat randomly). the pattern would preferably run from top to bottom- so
>one row would be, say, 0110101, and that sequence would move down the
>rows until it got to the end, then drop off. each sequence would be
>continuously followed by different sequences after it, running down in the
>same way.
>
>any tips?
>
>i also need to make all the LEDs glow 'analog' from dim to bright at a
>repetitive speed. that would be for a different part of the program,
>though, so
>obviously doesn't need to happen at the same time as the above shift register
>sequence.
>
>curse me and my long inquiries... [noparse]:)[/noparse]
>
>heather

[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Thanks Tracy, that application kit is exactly what I need. I didn't even think
to
look for something like that.

And your tips will probably prove helpful when I get through the kit.

Thanks so much,

Heather


--- In basicstamps@yahoogroups.com, Tracy Allen <tracy@e...> wrote:
> Hi Heather,
>
> Start with the Parallax application kit for the max7219
>
> http://www.parallax.com/dl/docs/prod/appkit/max7298leddisplaydvr.pdf
>
> Read the documentation about how to set up the hardware and the mode
registers.
>
> On the Stamp, you will become familiar with the SHIFTOUT command. For
example,
> SHIFTOUT 0,1,[noparse][[/noparse]$0357\]
> PULSOUT 2,4 ' load it
>
> would set the pattern in row 3 to $57 = %01011110.
>
> You can break the data into two separate variables, a line number and
> a pattern.
> DO
> I=5
> RANDOM pattern ' make pattern
> SHIFTOUT 0,1,[noparse][[/noparse]I, pattern]
> PULSOUT 2,4 ' load it
> PAUSE 100
> LOOP
>
> Also look at array table to hold seven patterns that will shift:
>
> pattern var byte(7) array of 7 patterns
>
> DO
> J=J+8//7 ' location pointer
> RANDOM pattern(J) ' new pattern at Jth location
> FOR I=0 TO 6
> SHIFTOUT 0,1,[noparse][[/noparse]I, pattern(J+I//7)] ' start new one at top
> PULSOUT 2,4 ' load it
> NEXT
> PAUSE 100
> LOOP
>
> The // operator is modular arithmetic on the Stamp, and allows the
> location pointer to move around the circular table modulo 7.
>
> I hope that helps get you started with the Stamp. (Those are not
> working examples, just snippets!)
>
> -- Tracy
>
>
>
> >hello everyone,
> >
> >thanks to your input, i was able get my 49 LEDs working, via a double
sided
> >printed circuit configuring the LEDs in an XY matrix, with the MAX7219 led
> >driver.
> >
> >now, i need to know how to program the stamp to control them.
> >
> >i know theoretically how to do this using the matrix, but don't know
> >the syntax
> >of the stamp (as this is my very first attempt at programming for
> >it). if anyone
> >has done anything similar, maybe you can offer some advice/code?
> >
> >the leds are in a 7x7 square, and i need to be able to make them run a
> >'psuedo random' on/off shift register pattern (i.e. each LED is
> >either on or off,
> >somewhat randomly). the pattern would preferably run from top to bottom-
so
> >one row would be, say, 0110101, and that sequence would move down
the
> >rows until it got to the end, then drop off. each sequence would be
> >continuously followed by different sequences after it, running down in the
> >same way.
> >
> >any tips?
> >
> >i also need to make all the LEDs glow 'analog' from dim to bright at a
> >repetitive speed. that would be for a different part of the program,
> >though, so
> >obviously doesn't need to happen at the same time as the above shift
register
> >sequence.
> >
> >curse me and my long inquiries... [noparse]:)[/noparse]
> >
> >heather
>
> [noparse][[/noparse]Non-text portions of this message have been removed]