Showcase [Showcase] Some Compact Designs of Decimal Counters with 7-Segment Display

[putianyi888]

7-segment display is not a new technique, but new techniques have to be involved to create compact counters. In this thread, I limit wiring within torch part to 4 tiles wide to make the display compact. All counters include a reset button. Not sure if I should include more details, but here you go.

Spoiler: 20x9 made by myself

The display matrix is shown on top of the second image. There are nine 2-tile-wide outputs from the first row of logic gates. The colours above the left tile show the connection to the left 4 segments while the colours above the right tile show the connection to the right 3 segments.

Spoiler: 12x12 made by myself

Spoiler: 10x15 made by Shuang

The number order of the multiplexer is 349526071, and 8 is the default. Note that the two yellow segments have to cross on the way to the control circuit.

 

[SovereignVis]

Yes, this is very small and compact. But I prefer to have 0 as the default in my 7-segment display. XD

 

[putianyi888]

Yes, this is very small and compact. But I prefer to have 0 as the default in my 7-segment display. XD

The reset switches does reset them to zero. The second 12x12 one actually has to be redesigned if the default is not zero.

 

[SovereignVis]

The reset switches does reset them to zero. The second 12x12 one actually has to be redesigned if the default is not zero.

Then 8 is not really the default is it? XD

 

[putianyi888]

Then 8 is not really the default is it? XD

The "default" in the last design means that if none of the AND gates of the multiplexer is true, then the torches display 8.

 

[JCsm]

Great!

 

[JCsm]

a challenge: creating a 14-segment alphanumeric display with a compact wire design that sequentially changes the letters at the press of a button: A, B , C ...

 

[SovereignVis]

So you want something like this then? It's doable, but it will take some time to wire up all the wire combinations to the logic gates.

 

[JCsm]

So you want something like this then? It's doable, but it will take some time to wire up all the wire combinations to the logic gates.
View attachment 261371View attachment 261370

Yes. I wanted an alphabet-based counter. The display could be a little smaller, but that's okay.

 

[skyress3000]

Hi, could you explain a little the operating principles behind these? I just starting playing this game and I'm really interested by the logic system. My own first project was a 2 digit 7-segment display (without a counter, just 8 bits of switch input) but mine is a lot larger than these. My strategy was just to represent each segment as a sum-of-products of the input bits, is there a more efficient way to do this? Here are some images of my solution:

Spoiler: images

 

[Mr Giraffe]

I suggest you read this guide first, and get used to working with faulty logic lamps.

Then come back here, and for the 20x9 and 12x12 versions, you should be able to identify which parts are for state incrementing, which parts are for resetting, and which parts actually toggle the display. The 10x15 is just demonic witchcraft, so I'm going to ignore it.

For just a 7-segment display with no counter (but can be hooked up to one!), here is a smaller version using XOR gates.

Spoiler

However, I don't think you should brainstorm circuits with XOR gates in mind; you can do 99% of whatever you need with just faulty lamps and AND gates.