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64 Incadescent Lamps — Parallax Forums

64 Incadescent Lamps

ArchiverArchiver Posts: 46,084
edited 2003-04-06 04:16 in General Discussion
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

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-04-04 21:09
    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!
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-04 21:59
    Some time ago I made a "Disco-Light" with 64 Bulbs 220V AC
    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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  • ArchiverArchiver Posts: 46,084
    edited 2003-04-05 03:01
    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"?

    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/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-05 03:04
    The Max7219 is a 8x8 seven segment multiplexer, which can easily be set to
    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
    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/
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-05 18:29
    Hi Baard:

    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
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-06 01:17
    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"?
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-06 04:16
    Thank you sir. Download it is.

    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/
    >
    >
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