Building a Shift Register with HD74LS02P NOR Gates, LEDs, Arduino UNO, and Breadboard

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#1 21662584 13 Jun 2012 10:04

Bob Duko Bob Duko

Anonymous

Post #1
21662584 13 Jun 2012 10:04

Hi -

I am trying to make a shift register using NOR Gates. I have been given multiple HD74LS02P Quad 2-Input Positive NOR Gates, LED lights, resistors, a breadboard and an Arduino UNO.

I have been trying to do this for a long time now, but I don't think I really understand how it works (the flip flop, shift register), and I'm kind of lost as to what to do to start.

Thanks,
Bob Duko
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#2 21662585 13 Jun 2012 11:08

Steve Lawson Steve Lawson

Anonymous

Post #2
21662585 13 Jun 2012 11:08

So....essentially, you're asking us to give you a course in digital logic? Did, whomever tossed these components at you, also include a book?
#3 21662586 14 Jun 2012 05:29

David Adams David Adams

Anonymous

Post #3
21662586 14 Jun 2012 05:29

START BY MAKING A FLIP FLOP. Sounds like a lab assignment to me. When I first studied electronics we had to make all our own digital circuits out of discrete components. Try making the flip flop out of transistors. Not old enough to have made them out of vacuum tubes.
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#4 21662587 14 Jun 2012 09:23

Steve Lawson Steve Lawson

Anonymous

Post #4
21662587 14 Jun 2012 09:23

There was a Nuts and Volts article, in the July 2009 issue, about a digital clock made exclusively from transistors (194 of them to be exact). Talk about discrete dedication!

It's now a kit: http://store.nutsvolts.com/product.php?productid=16865&cat=407&page=1

So, Bob, be grateful they didn't hand you Transistors
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#5 21662588 15 Jun 2012 02:20

Pieter Kruger Pieter Kruger

Anonymous

Post #5
21662588 15 Jun 2012 02:20

Good suggestion.

Would doing it in software on the Arduino board be considered cheating? :o)
#6 21662589 15 Jun 2012 02:25

Steve Lawson Steve Lawson

Anonymous

Post #6
21662589 15 Jun 2012 02:25

Absolutely!
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#7 21662590 15 Jun 2012 05:14

David Adams David Adams

Anonymous

Post #7
21662590 15 Jun 2012 05:14

You learn more doing it the hard way - you retain the knowledge. Unlike software, you tend to forget how you did it unless you heavily document your program. Besides breadboards make it much easier - unlike the days when you use to have to actually do wiring and soldering to make a prototype. Now it is just plug in and use jumper wires.
#8 21662591 15 Jun 2012 11:17

Steve Lawson Steve Lawson

Anonymous

Post #8
21662591 15 Jun 2012 11:17

Here's a Digital Circuits tutorial that looks pretty good;

http://www.asic-world.com/digital/tutorial.html

And this one, at least, shows how to use NOR gates to make a flip flop:

http://www.allaboutcircuits.com/vol_4/index.html

And if you get to that stage, I've yet to find anything that beats BatchPCB.com for one-off (or just small quantity) prototypes (for the hobbyist, because there is no guarantee of quick turn-around -- though, the service is so popular the turn around is currently excellent).

And DipTrace (diptrace.com) is _very_ "easy" PCB designing software (I mean, as easy as it gets, 'cuz designing a PCB is always going to be fairly complex). And there is a FREE full-featured (300 pin limit) version of DipTrace!

Eagle trace is also free, but it uses the old CAD/CAM paradigm, and unless you're used to that, there are at least two learning curves, the interface, and the technique.
#9 21662592 15 Jun 2012 12:55

Ben Ben

Anonymous

Post #9
21662592 15 Jun 2012 12:55

Actually there's even a free 500 pin non-profit license if you register on DipTrace's website.
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Topic summary

The discussion centers on building a shift register using HD74LS02P Quad 2-Input Positive NOR Gates, LEDs, resistors, a breadboard, and an Arduino UNO. The original poster seeks guidance on understanding and constructing flip flops and shift registers from discrete NOR gates. Responses emphasize starting with creating a flip flop circuit as a foundational step, highlighting the educational value of building digital logic circuits from discrete components rather than relying on software simulation. References to tutorials on digital circuits and NOR gate flip flop construction are provided, including links to ASIC World and All About Circuits. Additional advice includes using breadboards for easy prototyping and recommendations for PCB design software such as DipTrace (noting its free versions and licenses) and BatchPCB for small quantity prototype fabrication. The conversation also humorously contrasts discrete component construction with software implementation on Arduino, underscoring the deeper learning achieved through hardware assembly.
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Building a Shift Register with HD74LS02P NOR Gates, LEDs, Arduino UNO, and Breadboard

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