Maker Pro
Maker Pro

5x7 LED matrix fixed display

  • Thread starter Englishman in Ankara
  • Start date
M

mmm

Jan 1, 1970
0
Spehro said:
I think generating the SPI signal for the 7219 might be even more
unpleasant than generating the drive signals directly.

not at all,

you can create a fixed pattern 8-channel signal generator with: a bios
Flash, n-bit bit counter and a clock ( '555 0r 7404 rc )

use the counter to address the bytes in the flash on the data output
you can get the pattern

ah! the bios flash must be strictly a recover part from old MB :)

you can easly create sequence up to 256*1024-1 states ....
 
E

Englishman in Ankara

Jan 1, 1970
0
That's what I was looking for! <g>

Why didn't I think of that?

When I feel like changing the message it's simple too!

Thanks!
 
D

Donald

Jan 1, 1970
0
mmm said:
not at all,

you can create a fixed pattern 8-channel signal generator with: a bios
Flash, n-bit bit counter and a clock ( '555 0r 7404 rc )

use the counter to address the bytes in the flash on the data output
you can get the pattern

ah! the bios flash must be strictly a recover part from old MB :)

you can easly create sequence up to 256*1024-1 states ....


This is one of those interesting solutions that says/asks,

Yes it can be done this way, but wouldn't be cheaper, simpler, faster to
use a micro ??

Now you need a programmer to program the flash chip !!

With a micro, you can use a serial port to re-program your message and
save it in internal EEPROM.

Or even easier and very cheap:

go to google and enter "LED name badges"

Heres a start: http://www.digibadge.com/flash.asp

Donald
 
M

mmm

Jan 1, 1970
0
Donald said:
This is one of those interesting solutions that says/asks,

Yes it can be done this way, but wouldn't be cheaper, simpler, faster to
use a micro ??

Now you need a programmer to program the flash chip !!

With a micro, you can use a serial port to re-program your message and
save it in internal EEPROM.

Or even easier and very cheap:

go to google and enter "LED name badges"

Heres a start: http://www.digibadge.com/flash.asp

Donald

the micro is THE solution if you do the real project , the flash
solution, to do some complex state machine have the advantage that can
be done with junk box parts , like some counters and the recovered flash
, and more important can be an useful idea for other application where
the micro can't substain the higer speed of an hardware project, you can
say "switch to CPLD or FPGA for even better performance" but I can say
"they have a non zero cost".

the net response to the original question is
"use the micro, luke"

but the interesting thing of the news , I think, is let serach for more
extravagant solution that can be used in some other application

and last bit a flash programmer can be made with junk box parts and can
be very useful.
 
R

Rich The Newsgroup Wacko

Jan 1, 1970
0
Yea, I meant to say Ooooops!

Whoooops! Guess ya got me on that'n! ;-P
--
Cheers!
Rich
------
"Limericks are art forms complex,
Their topics run chiefly to sex.
They usually have virgins,
And masculine urgin's,
And other erotic effects."
 
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