4-bit adder (wired circuit)

[Insectoid]

Well, I saw that someone put pictures of my adder on facebook, so I figured I'd share. It's a 4-bit full adder, with a decimal display. Rather useless, but quite fun to do. You set some switches to high or low to produce 2 binary numbers between 0 and 15 (inclusive), which are then sent to both the adder and displays, are added together using a half adder and 3 full adders. The sum is then output to the display (input and sum are also displayed in binary with LEDs). This took all of 3 classes to do, but it is the largest wiring project I've ever done, so I'm proud of it (I think it's still assembled somewhere...).


Anywho, pics!

The whole thing:


The wiring for the displays (2+4=6 ) (oh yeah, we didn't have enough chips to do 2-digit displays, so after 4+5=9, you have to read the sum in binary):


The wiring for the adders:


So, that was interesting. If you want to comment, go ahead. Dunno exactly what there is to comment about...

[Vertico]

I remember back in highschool we had to emulate a typical car intersection, light set. Advanced greens, walk lights etc.
Someone had their wiring looking like that and the teacher flipped out on him because he hated messy wiring.

Even when we only had to put some basic gates together we had to have the wiring flush, straight and color coded or you would fail without question.

[Insectoid]

Really? My teacher doesn't care. He never even mentioned color coding. That is extremely strict, though I can see why he did that. Not that it would matter to him, it's not him who has to figure out the bugs. As long as it works, you should get marks (rather difficult to screw it up and still get the right output (this is NOT my attitude toward programming, the difference being that we had several circuit diagrams (half adder, full adder, etc) to work with, and didn't really do much thinking, more like copying down the answers. The only real thinking I did was when arranging the inputs, which were just plugged in backwards so that they could be read in binary))

[delparnel]

Haha. I did one of these once. However, all of my wires were but perfectly to the exact lengths required.