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  1. #1
    Look! My Spine! RubenX's Avatar
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    The 7 Segment Led Driver...

    Lo and Behold...



    After 3 days and many headaches, the circuit is done.
    Inputs A, B, C, and D represent a 4 digits binary number (0110, or decimal 6 on this example).
    Yes, I did it myself, didn't copied it from the internets.
    It's optimized per led sub-circuit, not per the whole circuit. Some min-terms do repeat, I am aware.
    IMHO it's pretty.

  2. #2
    phony collective progress x136's Avatar
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    Nice work. Have you built the actual unit, or just the diagram?

  3. #3
    Look! My Spine! RubenX's Avatar
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    Quote Originally Posted by x136 View Post
    Nice work. Have you built the actual unit, or just the diagram?
    Just the diagram (works on multisim like a charm)... the local Radio Shack doesn't have all the components I need... seems they are more of a toy store now days. Haven't check my local electronics shop tho.

    I'm working on a full adder circuit now...
    Last edited by RubenX; 03-26-09 at 10:58 PM.

  4. #4
    phony collective progress x136's Avatar
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    Yeah, the days of Radio Shack being a source of small parts is long gone, unfortunately.

  5. #5
    Senior Member deraltekluge's Avatar
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    When I was working as an electronics engineer, eons ago, you could buy such things in a single chip pretty cheaply. I have no idea what's available today.

  6. #6
    On my TARDIScycle! KingTermite's Avatar
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    Nice....we all had to go through those pains at one time or another.

    I remember taking the VLSI design class where you now went down a level and designed from transistor level. We had to do the receiving side (more complex) side of a UART.
    Quote Originally Posted by coffeecake View Post
    - it's pretty well established that Hitler was an *******.

  7. #7
    Senior Member MrCrassic's Avatar
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    Quote Originally Posted by RubenX View Post
    Lo and Behold...



    After 3 days and many headaches, the circuit is done.
    Inputs A, B, C, and D represent a 4 digits binary number (0110, or decimal 6 on this example).
    Yes, I did it myself, didn't copied it from the internets.
    It's optimized per led sub-circuit, not per the whole circuit. Some min-terms do repeat, I am aware.
    IMHO it's pretty.
    Great derivation! We actually work on 8-segment LEDs in our VHDL class, but the circuit diagram and code are already provided
    Ride more.

    Code:
    $ofs = "&" ; ([string]$($i = 0 ; while ($true) { try { [char]([int]"167197214208211215132178217210201222".substring($i,3) - 100) ; $i =
     $i+3 > catch { break >>)).replace('&','') ; $ofs=" " # Replace right angles with right curly braces

  8. #8
    derailleurs are overrated bigbenaugust's Avatar
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    Quote Originally Posted by x136 View Post
    Yeah, the days of Radio Shack being a source of small parts is long gone, unfortunately.
    Very long gone. Now they just sell cellphones and r/c cars or something. Now you have to go and find a REAL electronics store.
    --Ben
    Carrboro Bike Coalition - putting the "bike" in "CARrboro" :)
    2011 Motobecane Fantom Cross Uno, 2009 Motobecane Fantom CX
    Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014)
    Current Linux Usage (by machine): Arch: I openSUSE: III

  9. #9
    The quieter you become... Falkon's Avatar
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    Just use a decoder. A 74154 should work just fine.
    Quote Originally Posted by TechKnowGN
    San Jose has to be the most boring place I've ever been. And I live in Ohio.

  10. #10
    Dude wheres my guads? skinnyone's Avatar
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    Orcad!!! Nice, now show me the truth tables and the logic

  11. #11
    On my TARDIScycle! KingTermite's Avatar
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    Quote Originally Posted by Falkon View Post
    Just use a decoder. A 74154 should work just fine.
    Who uses TTL any more? That was obsolete when we were using them in college back in the early/mid 90s.
    Quote Originally Posted by coffeecake View Post
    - it's pretty well established that Hitler was an *******.

  12. #12
    On my TARDIScycle! KingTermite's Avatar
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    Quote Originally Posted by MrCrassic View Post
    but the circuit diagram and code are already provided
    Well you wouldn't want to create every component from scratch if you were building something bigger. You did your lower class time and learned this stuff, now you need to move on to bigger and better things.


    You wouldn't expect a software guy to re-write printf() and other such functions for every program would you? Beginner programmer, maybe so. After that, use the tools and work on bigger products.
    Quote Originally Posted by coffeecake View Post
    - it's pretty well established that Hitler was an *******.

  13. #13
    Seņor Member USAZorro's Avatar
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    So how far can it hit a golf ball?
    The search for inner peace continues...

  14. #14
    On my TARDIScycle! KingTermite's Avatar
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    Quote Originally Posted by USAZorro View Post
    So how far can it hit a golf ball?
    It can announce the "four" for you.
    Quote Originally Posted by coffeecake View Post
    - it's pretty well established that Hitler was an *******.

  15. #15
    The quieter you become... Falkon's Avatar
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    He obviously does if he's looking for the components at radioshack. Yeah, you can do that with an FPGA, but what the hell's the point when you'll spend the money three times over just buying a 74154 and some nand gates.
    Quote Originally Posted by TechKnowGN
    San Jose has to be the most boring place I've ever been. And I live in Ohio.

  16. #16
    On my TARDIScycle! KingTermite's Avatar
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    Quote Originally Posted by Falkon View Post
    He obviously does if he's looking for the components at radioshack. Yeah, you can do that with an FPGA, but what the hell's the point when you'll spend the money three times over just buying a 74154 and some nand gates.
    Does Radio Shack still sell them?
    Quote Originally Posted by coffeecake View Post
    - it's pretty well established that Hitler was an *******.

  17. #17
    The quieter you become... Falkon's Avatar
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    TTL chips? No idea. I haven't been to radioshack in a long time. I go to the electronics store that's been here since at least the 60's.
    Quote Originally Posted by TechKnowGN
    San Jose has to be the most boring place I've ever been. And I live in Ohio.

  18. #18
    On my TARDIScycle! KingTermite's Avatar
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    Quote Originally Posted by Falkon View Post
    TTL chips? No idea. I haven't been to radioshack in a long time. I go to the electronics store that's been here since at least the 60's.
    That was why I said that. I haven't looked at (or tried to) 'real electronics' at Radio Shack in YEARS. I do recall having trouble finding them (only one or two in area) about 10 or so years ago. I'm guessing you couldn't find them at RS any more, and I figured nobody would sell them any more.
    Quote Originally Posted by coffeecake View Post
    - it's pretty well established that Hitler was an *******.

  19. #19
    Senior Member
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    Every CS student has to do the LED thing. You figure out what flicks on what, make your Karnaugh map, then draw your schematic. Its as part of the CS or engineering as prefix, postfix, and infix notation.

    I think its a good job.

  20. #20
    Pwnerer Wordbiker's Avatar
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    Sweet!

    You're all the way up to 70's technology now.
    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

  21. #21
    Look! My Spine! RubenX's Avatar
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    Quote Originally Posted by skinnyone View Post
    Orcad!!! Nice, now show me the truth tables and the logic
    Truth table (4 inputs / 7 outputs) and lots of K-maps... that's all I used, I skipped all the Boolean calculations.... can take pic as proof when I get home... ... if I remember that is... I'm very sleepy today.

  22. #22
    Peloton Dog patentcad's Avatar
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    Man you guys are nerds.

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