Sum of Products PCB

This project takes a simple four-bit adder and has it built upon a PCB.

Supplies required to construct the project (Can differ depending on given truth table):

• PCB (~$5.00)
• 2 LEDs ($1.99)
• 4 Switch Dip Switch ($0.95)
• 2 Or Gates ($1.16)
• 1 And Gate ($0.99)
• 1 Not Gate ($0.89)
• 2 330Ω Resistors ($0.99)
• 3 1000Ω Resistors ($0.99)
• Wires

To begin, you must first figure what logic gates you require by reverse engineering a truth table. You can create this truth table on your own by having 3 switches and randomly deciding the values of your first and second LEDs. Once you have created your equations, you can count up how many gates are required for your PCB, they may not be the same as the gates mentioned in the supplies section were required specifically for my truth table. Once you have figured out which gates are required and how to wire them together, you can move on to the next step.

Once you have successfully reverse engineered your truth table you can proceed to the creation of the PCB. We will be creating our PCB on EasyEDA. To start off you must make a sketch of your circuit. This can be done directly on EasyEDA. To create a sketch, all you must do is find all the components you require and wire them together in other to make the circuit you will be attaching to your PCB. After completing your sketch, make sure to check your nets, you can proceed to converting it into a PCB schematic. Here you will decide on the layout and design of your PCB. At this point you are free to create your own unique layout and designs. Once you have created a schematic you are happy with, you can go ahead to ordering your board.

Once your PCB has arrived, you can begin to solder your components onto the board. This is a rather simple process though it could take some adjusting at first. If it happens to be your first time soldering, there are many tutorials available online to teach you how to correctly solder your components. One of these videos will be linked below to assist you whilst creating this project.

Soldering Tutorial

If every step was completed properly, you should now have a functioning 4-bit adder mounted on a PCB.