Repeat the above step to make all connections as shown on the schematic from Boondog's web site. Also, you can use the Name tool to label resistor and capacitor values. Upon completion, your schematic should look like the one below.
Routing Your PCB Now that we have finished the schematic, we are ready to use the Board tool. From the schematic editor, click on the Board button in the top toolbar. Click Yes when prompted to create the board from the schematic. You should now see a window that shows the packages of all the parts from your schematic (with connections) and a large white rectangle (this is the outline of the PCB).
Before moving any parts onto the board, we must first set the grid size. This will ensure that all of our parts are placed on the grid when moved. A good rule of thumb is to locate the part with the smallest pitch (distance between pins) and set the grid size to half of that. For example, the part on our board with the smallest pitch is the microcontroller (pitch = 100 mil or 0.1"). Therefore, our grid size should be set to 50 mil. To do this, click on the grid button in the top left of the Board window. Modify the grid pop-up window to look like the one below. Now that the grid is properly set, use the Move tool to place the parts inside the white outline. Once you have your parts neatly organized and in a confined area, you want to also shrink the size of the board. This can be done again with the Move tool by left-clicking on the edges of the PCB outline. When finished with this step, the board should look like the one below.
One main advantage with any recently developed layout software is the autorouter function. This tool is used to automatically route all of the connections shown on your board. Before we start the autorouter, we must specify some design rules. Select Edit => Design Rules and then click on Sizes . Specifying the minimum width of each route will help increase the chances of a fully routed board when using the autorouter tool. This is especially important if you are working with surface mounted packages. This also is dependent on your PCB manufactures (e.g AP Circuits can only fabricate boards with a route width of 7 mil). For now, let's keep this at 10 mil and click OK . Now we are ready to use the
- Fall '14
- web site, Printed circuit board, EAGLE Layout Editor, boondog web site