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Hi,

I'd like to be able to control 90 LED's individualy with a bx24. I know there are some ic2 IO expanders as I've seen other projects using them. I was just wondering what anyone here would recommend as to the best way to do this? I do need to be able to turn the led's on/off pretty fast.

Thanks.
------------------------------------



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I have build a circuit that lights up to 48 leds. 6X8 matrix. I used the BX24 to source 6 rows and 8 to sinc. Ofcourse I can only light one led at a time as the BX24 supplies the power. I think I would use a 74LS154 and use a nibble to drive it to sinc 16 rows. Then I would sourse the number of rows I need after that. You can easily drive up to 128 leds and still have a nibble left over.

----- Original Message ----
From: Paul J. Smith
To: "b...@yahoogroups.com"
Sent: Monday, June 2, 2008 12:20:03 AM
Subject: [BasicX] I/O Expanders
Hi,

I'd like to be able to control 90 LED's individualy with a bx24. I know there are some ic2 IO expanders as I've seen other projects using them. I was just wondering what anyone here would recommend as to the best way to do this? I do need to be able to turn the led's on/off pretty fast.

Thanks.

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



(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )

Hi,
I've used a chip TC4094 to create a large number of outputs using just a
clock, data, and strobe lines. Essentially you feed your bit pattern
serially then send a strobe pulse to update them all at the same time. The
nice thing is that you can control 8 leds (Or outputs) with one of these
chips. They can be connected in series so all your 90 LED's could be
controlled by just three lines or you can use additional pins from your BX
to control sub groups of the strobe lines. The chips is described as an 8
stage shift and store register.
I hope this helps.
Harry
_____

From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf Of
Paul J. Smith
Sent: Monday, June 02, 2008 3:20 AM
To: b...@yahoogroups.com
Subject: [BasicX] I/O Expanders

Hi,

I'd like to be able to control 90 LED's individualy with a bx24. I know
there are some ic2 IO expanders as I've seen other projects using them. I
was just wondering what anyone here would recommend as to the best way to do
this? I do need to be able to turn the led's on/off pretty fast.

Thanks.

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



(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )

Hi,
There is a max6969 serial? four line interface with 16 led output driver.
I never used it but you can look at it. You can daisy them to get 90.

rosarite?

-----Original Message-----
From: Paul J. Smith
To: b...@yahoogroups.com
Sent: Mon, 2 Jun 2008 2:20 am
Subject: [BasicX] I/O Expanders

Hi,

I'd like to be able to control 90 LED's individualy with a bx24. I know there are some ic2 IO expanders as I've seen other projects using them. I was just wondering what anyone here would recommend as to the best way to do this? I do need to be able to turn the led's on/off pretty fast.

Thanks.

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



(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )