LOGIC.LY – HALF ADDER CIRCUIT

In this task, you will create the Half Adder circuits. It is a simple circuit that adds up two bits together.

Go to the free online demo for Logic.ly to create the following circuit.

a) Complete the binary additions below. Note that your answers should have two digits in them.

0 + 0 = ___ ___

0 + 1 = ___ ___

1 + 0 = ___ ___

1 + 1 = ___ ___

b) We will refer to the inputs as A and B. Since the answers need two digits, there are two outputs. The left digit will be Q and the right digit will be R.

So, when A is 0 and B is 1, then Q is 0 and R is 1.

Create two truth tables; one for A, B and Q and another for A, B and R.

c) Consider the truth table for A, B and Q. What common gate is that?

d) Consider the truth table for A, B and R. What common gate is that?

e) Create the half adder circuit that adds two bits (A and B) together. It should look similar to the image below.

f) Test your circuit to make sure it works. Refer to the above additions to see if you have a match.

To Submit

A screen capture of your half adder circuit. Name your file halfadder.png.