Eagle is an electronics layout and design software that is very comprehensive as well as free (with minor restrictions). It is produced by CadSoft and is available for download at www.cadsoft.de . Just look for the freeware download version on the site for the latest release.
The only limitations to the freeware version are the board size, the number of signal layers, and the number of schematic sheets. The maximum board size in the freeware version is 100mm X 80mm, or about 4” X 3.2”. The freeware version only allows the creation of two signal layers, the top and the bottom and it can create only one schematic sheet per project. For most projects, those restrictions are well within the requirements of the inventor. Also, before you can use the software to produce a product for sale, you must purchase the license for the lite version. The cost is minimal at $49. If you require additional signal layers, board size, or schematic sheets, the software has two upgrade versions available for $199 and $399. You can check their site for the features offered with each upgraded version.
Choose your correct language and operating system for the software download. My language is English and I am using Windows XP TM . The download I chose was labeled eagle-win-eng-4.15.exe. The file name will change as new revisions are released, but you get the idea.
When it is installed, launch Eagle and a registration screen will appear. Unless you have purchased a license, click the 'Run as Freeware' button.
Figure 14.1
The next screen that appears will be the main control panel. Start by clicking File, New, then Project.
Figure 14.2
A new subdirectory named New_Project_1 will be created and highlighted. You can rename the project to whatever you wish. I will name mine Atmegaproject1. When you have decided on a name or are satisfied with the default name, right click on the project, go to 'New' and click on 'Schematic.'
Figure 14.3
