Introduction to Eagle
I hope you all are good, in the previous series of tutorials I have discussed about the basics commands employed for developing the layout in the Allegro PCB Designer at the beginners’ level. From now on I will start another series of tutorials that will center on Eagle which is another popular PCB designing software.
Let us discuss the brief introduction of the PCB Designing.
Schematics in Eagle:
Before designing the PCB in the Eagle the schematics is drawn which defines which pin of one component is connected to another pin of another component. For designing the schematics of the circuit in the Eagle it is important that the schematics symbol of all the components employed in the circuit are present in the library of the Eagle. Once the schematic is drawn in then the board layout begins.
Footprint of the components in Eagle :
For designing the printed circuit board of the circuit an inevitable element is the footprint of the electronic components. Just as the schematic symbol is to be present in the library of the Eagle for drawing the schematics similarly the footprints of the electronic are also necessary to be present in the library of the Eagle for designing the PCB. The footprint of the electronic component is you can say a pad on which the components are mounted and thus soldered. The footprint of the through hole and surface mounted components are as shown in the following figure:
Placing the Components in Eagle Software:
Once you have drawn the schematics and make sure that the footprints of all the components employed in the schematics are present in the library of the Eagle then click on “Switch / Generate the Board” command. A window will pop up in which you will see the footprints of all the components randomly placed here and there and connections of the pins. Randomly placed footprints are as shown in the following figure:
Thus before doing anything the components are placed in an organized manner. The placement of electronic components on PCB is an important task usually the client suggests where a component is to be placed and sometimes the designer has to exploit his / her expertise to place the components on the board. The following figure shows the components properly placed on the PCB.
After placing the components properly the next step is to set the boundary of the board on which the circuit is to be laid. The board dimensions are given usually by the clients or the designer had to set the dimensions himself / herself by assessing the routing area and other constraints. The following figure shows the layout of the board.
The final and yet important step in the development of the PCB is routing. Routing is the process of connecting one pin of a component to another pin of another component with the help of the copper etches. There a lot of things that are to be kept in mind while routing on the board, for example care is to be taken so that two signal lines are not so closed so as to interfere each other, bent angle should be sent that the single should not get distorted, width of the copper etch should be properly selected for high power signals. But these considerations are employed at advance or intermediate level and will be discussed later. In this series I will stick to the basis of the Eagle software. The routing of the board is as shown in the following image:
eagle pcb design software tutorial:
Once the routing of the PCB is completed the Gerber files are generated and sent to the PCB fabrication house to develop the PCB on the FR4 fibre glass material.
That is all for now, I hope this tutorial would be helpful for you. In the next tutorial I will discuss basic commands of the Eagle used at the beginners’ level. Till then stay connected, keep reading and enjoy learning.
eagle pcb design software tutorial