64 Incadescent Lamps
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Posts: 46,084
Hi!
I need suggestions on how to control 64 incadescent lamps, preferably
with a single BS 2. Are there any ic´s which can do this many ouputs?
My solution so far is to use a 74HC164 serial shift register combined
with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
ekstra power. I am interested in other sollutions with fewer parts
involved. The lamps will be set up in an 8 X 8 grid and display
letters, numbers and so forth. Any ideas would be much appreciated!
-Baard
I need suggestions on how to control 64 incadescent lamps, preferably
with a single BS 2. Are there any ic´s which can do this many ouputs?
My solution so far is to use a 74HC164 serial shift register combined
with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
ekstra power. I am interested in other sollutions with fewer parts
involved. The lamps will be set up in an 8 X 8 grid and display
letters, numbers and so forth. Any ideas would be much appreciated!
-Baard
Comments
matrix and you can drive them with 16 pins. You need 8 P-channel or PNP
devices to drive the rows and 8 N-channel or NPN devices to drive the
columns. The devices would have to be rated high enough to handle the
current of 8 lights.
You address each light by turning on a row and column. The down side is you
can only control a single light, a single row, a single column or all the
lights. The solution to this limitation is to turn on the bulbs forming the
desired pattern one at a time, very briefly, over and over. I've done this
with a 3 x 3 LED matrix and it works pretty cool.
There are also chips designed to drive several 7-segment displays, and these
can also be used to directly drive discrete LEDs or bulbs, using a BJT or
MOSFET. I believe the limit on those is 5 x 7 though. There is a Nuts &
Volts article about this -- I believe its in the first book.
Original Message
I need suggestions on how to control 64 incadescent lamps, preferably
with a single BS 2. Are there any ic´s which can do this many ouputs?
My solution so far is to use a 74HC164 serial shift register combined
with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
ekstra power. I am interested in other sollutions with fewer parts
involved. The lamps will be set up in an 8 X 8 grid and display
letters, numbers and so forth. Any ideas would be much appreciated!
I used two of the "MM5450N" and the optcoupler MOC 3021
and 64 little Triacs.
If You use AC Power and like more details, let me know
Heinz
Hi!
I need suggestions on how to control 64 incadescent lamps, preferably
with a single BS 2. Are there any ic´s which can do this many ouputs?
My solution so far is to use a 74HC164 serial shift register combined
with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
ekstra power. I am interested in other sollutions with fewer parts
involved. The lamps will be set up in an 8 X 8 grid and display
letters, numbers and so forth. Any ideas would be much appreciated!
-Baard
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&
Volts article about this -- I believe its in the first book.
To which I, the ever starved reader ask, "Nuts and Volts is in a BooK?"
Where, what, and how many, since you say "first"?
Hey Wilf. I got JunkBots. I love JunkBots. But I only got it 2 1/2 hours
ago, so I haven't built any junkbots. No wonder you were so up on the book.
Not only is it wonderful, but you are in the credits!
Thanks for putting me onto it.
Mic
Original Message
From: Rodent <daweasel@s...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, April 04, 2003 3:09 PM
Subject: Re: [noparse][[/noparse]basicstamps] 64 Incadescent Lamps
> If you don't want to buy 64 MOSFETS, you can set up the bulbs as an 8 x 8
> matrix and you can drive them with 16 pins. You need 8 P-channel or PNP
> devices to drive the rows and 8 N-channel or NPN devices to drive the
> columns. The devices would have to be rated high enough to handle the
> current of 8 lights.
>
> You address each light by turning on a row and column. The down side is
you
> can only control a single light, a single row, a single column or all the
> lights. The solution to this limitation is to turn on the bulbs forming
the
> desired pattern one at a time, very briefly, over and over. I've done this
> with a 3 x 3 LED matrix and it works pretty cool.
>
> There are also chips designed to drive several 7-segment displays, and
these
> can also be used to directly drive discrete LEDs or bulbs, using a BJT or
> MOSFET. I believe the limit on those is 5 x 7 though. There is a Nuts &
> Volts article about this -- I believe its in the first book.
>
>
Original Message
>
> I need suggestions on how to control 64 incadescent lamps, preferably
> with a single BS 2. Are there any ic´s which can do this many ouputs?
> My solution so far is to use a 74HC164 serial shift register combined
> with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
> ekstra power. I am interested in other sollutions with fewer parts
> involved. The lamps will be set up in an 8 X 8 grid and display
> letters, numbers and so forth. Any ideas would be much appreciated!
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
control just a dot matrix. The only thing is it's meant to drive LEDs, so
you'd need to provide some type of buffer between the Max's pins and the
incandescent lamps. The Max only uses 3 pins on the stamp so that would
leave the others free for other tasks...
Might be worth a look, here's the link to it on Parallax's site...
http://www.parallax.com/detail.asp?product_id=603-00001
Chris
Original Message
From: <baard-t@t...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, April 05, 2003 3:48 AM
Subject: [noparse][[/noparse]basicstamps] 64 Incadescent Lamps
Hi!
I need suggestions on how to control 64 incadescent lamps, preferably
with a single BS 2. Are there any ic´s which can do this many ouputs?
My solution so far is to use a 74HC164 serial shift register combined
with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
ekstra power. I am interested in other sollutions with fewer parts
involved. The lamps will be set up in an 8 X 8 grid and display
letters, numbers and so forth. Any ideas would be much appreciated!
-Baard
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
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Body of the message will be ignored.
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You might look into the Allegro 6276 if you are working with small
lamps. It's good for up to 17 volts on each of it's 16 drive pins and
up to 90 ma per pin. Has serial drive and a data out pin so you can
cascade 4 of them to control 64 lamps. Has current control on each pin
so you don't need any external resistors. This is not a multiplexed
output, it's one wire for each LED or lamp and drives with DC. I'm
running a 6 digit clock with 20 ma per segment (draws about 700 ma) and
the LEDs run warm to the touch.
You can see my clock progress at
<http://www.pacificsites.com/~brooke/LED1PC2.shtml>
the 6276SA is at <http://www.allegromicro.com/sf/6276/>
Have Fun,
Brooke Clarke, N6GCE
http://www.prc68.com
Date: Fri, 4 Apr 2003 21:48:38 +0200
From: baard-t@t...
Subject: 64 Incadescent Lamps
Hi!
I need suggestions on how to control 64 incadescent lamps, preferably
with a single BS 2. Are there any ic´s which can do this many ouputs?
My solution so far is to use a 74HC164 serial shift register combined
with eight 74HC374 flip-flop´s and 64 IRF520 mosfet transistors for
ekstra power. I am interested in other sollutions with fewer parts
involved. The lamps will be set up in an 8 X 8 grid and display
letters, numbers and so forth. Any ideas would be much appreciated!
-Baard
have appeared in Nuts & Volts magazine. There are currently three volumes,
which contains all the articles up to a few months ago. You can buy the
books or download the articles for free from Parallax' web site.
Original Message
Rodent wrote "I believe the limit on those is 5 x 7 though. There is a Nuts
&
Volts article about this -- I believe its in the first book.
To which I, the ever starved reader ask, "Nuts and Volts is in a BooK?"
Where, what, and how many, since you say "first"?
Trying to save bucks. I like the book idea, but I always break the spines.
Works better if I can put reference material through my printer to 3-hole,
and stick it in a binder.
Mic
Original Message
From: Rodent <daweasel@s...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, April 05, 2003 7:17 PM
Subject: Re: [noparse][[/noparse]basicstamps] 64 Incadescent Lamps
> Nuts & Volts and Parallax teamed up to publish all the Stamp articles that
> have appeared in Nuts & Volts magazine. There are currently three volumes,
> which contains all the articles up to a few months ago. You can buy the
> books or download the articles for free from Parallax' web site.
>
>
Original Message
>
> Rodent wrote "I believe the limit on those is 5 x 7 though. There is a
Nuts
> &
> Volts article about this -- I believe its in the first book.
>
> To which I, the ever starved reader ask, "Nuts and Volts is in a BooK?"
> Where, what, and how many, since you say "first"?
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>