hey guys what's up its me pika cubed and welcome back to my video in this video I wanna teach you how to build a full adder and Lotus him so here's my lodge ascend window here you can see right there and I'm gonna title this file save as and I'll just call it la just put it in my desktop Lajja sim you I'll just call it matter so now we have our adder and it's the main circuit so as you can see I have got my address my full adder schematic here so the first thing we need to do is add some inputs so we've got a B and C which is the carry input so we'll add some pins from right here after the Select and text tool just right after those and we can see it's a pin and it is not an output so we'll just add that right here right here so a B and then carry in I'll move that right there so let me just label these a B and C there we go so a B and C now the next thing we need to do is you can see I believe that's an XOR gate yes XOR gate so we need an XOR gate right there and then it only needs two two inputs that'll work and then we need to connect B and a to it so I'll connect B and I'll connect a there we go now we have a and B connected to this XOR gate now I'll just trail across the top so we need another XOR gate here's here's one and we can connect it right about there and it only needs two as well so I can click on the number of inputs and connect this XOR gate to this XOR gate and then we can get an output pin put it right there and label that some and now we can't let's let's connect up our and gate right here so I'll grab an and gate put it right here and let's let's connect our a that looks like the a connects to the the top of the and gate and by the way only need to on this one as well so can act up the top of our and gate or the top of the top of the and gate to the a pin and then B connects to the bottom of the and gate like this and yeah that should work and then we can connect up C to our second XOR gate right there and now we need another and gate right here and a or gate let's grab the an gate and it looks like this and gate goes well we can put it right here because it connects to the carry we'll put it right next to this XOR gate it connects to the carry the carry input right here so I'll just bring that in and make sure this is on two as well looks like these are these are all on two so I think we can connect this one up to the output of the first XOR gate now we can connect up our or gate right here and wire it up and make oh yeah that'll work make sure it's a two as well and then we can connect it up to this and gate and now we can add a pin for our carry out so just label it carry out there we go it's kind of off the screen I can just zoom out a bit sure so we've got our carry n a and B sum and carry out so let's see if this works so if we grab our poker tool we can let's say add one looks like the Sun is one that's good add one plus one we get a carry-out that's exactly what we're looking for now if we add all of them yes we get a sum and a carry out that is exactly what the what the full adder should do so now in my next video I'll show you how to daisy chain these together and make a 8-bit adder stay tuned