LED Binary Calculator

[imdamasta11]

dude you should do a tutorial

[batteryhead15]

@imdamasta11 I have one and it's on instructables. I will add a link in the description bar.

[twoofakindmagic]

hey, this is very impresive. I have a couple of questions. Did you write the entire schematics first for the 8 bit adder? if so, where are all of the gates/transistors? I'm trying to make a calculator for myself, but I would like to make mine subtract but I'm having some trouble. Subtraction isn't commutative, so the order matters. However, logic gates don't care about about the order, so I'm not really sure how to approach this. Any ideas?

[batteryhead15]

@twoofakindmagic I didn't use any logic gates, because the gadget will be huge and complex to use.

I just used one micro controller to take care of all the logic, thats why you don't see any logic chips.

[twoofakindmagic]

@batteryhead15 Awww thats not much fun but ok, thnx

[o0joshua]

@twoofakindmagic for substraction with gates you could do your truth table for a 3 bit substracter with Difference and Borrow as the results... The function is D=x'y'z+x'yz'+xy'z'+xyz B=x'y+x'z+yz with xyz as the bits in that order

[Moratorium]

Where's the power source?

[batteryhead15]

@Moratorium 9V battery

[Moratorium]

@batteryhead15 WHERE?

[batteryhead15]

@Moratorium I had a 9V battery in my multimeter and i just ran wires from it.

hh kind of silly to be honest

[Moratorium]

@batteryhead15 I am asking because I can't see any wires from the board.

[batteryhead15]

@Moratorium look at the right bottom of the board and you will see 2 wires black and red

[Blacklemon67]

Hells yeah :D that's awesome