Logisim is an educational tool for designing and simulating digital logic circuits. It has been originally created by Dr. Carl Burch and actively developed until 2011. After this date the author focused on other projects, and recently the development has been officially stopped (see his message here).

In the meantime, people from a group of swiss institutes (Haute École Spécialisée Bernoise, Haute École du paysage, d'ingénierie et d'architecture de Genève, and Haute École d'Ingénierie et de Gestion du Canton de Vaud) started developing a version of Logisim that fitted their courses, integrating several tools -- for instance a chronogram, the possibility to test the schematics directly on an electronic board, TCL/TK consoles, ...

The project is currently maintained by the REDS Institute, which is part of the Haute École d'Ingénierie et de Gestion du Canton de Vaud, Yverdon-les-Bains, Switzerland.

We have decided to release this new Logisim version under the name logisim-evolution, to highlight the large number of changes that occurred in these years, and we actively seek the contribution of the community.

• chronogram -- to see the evolution of signals in your circuit
• electronic board integration -- schematics can now be simulated on real hardware!
• board editor -- to add new electronic boards
• VHDL component -- a new component type whose behavior is specified in VHDL
• TCL/TK console -- interfaces between the circuit and the user
• DIP switches
• RGB LEDs
• large number of bug-fixes
• GUI improvements
• automatic updates
• code refactoring
• ...

You can find an already compiled stable version of the code here. To execute it, click on the downloaded file or type in a console

java -jar logisim-evolution.jar

You can also compile it by yourself by cloning the repository on your local machine. Once this is done, enter the directory and execute

ant run

This also creates locally a .jar file, that you can distribute and use on other machines.

Here you can find a tutorial (French only for the moment!) that explains some basic usage of Logisim. The electronic card referenced in the tutorial is a small card we use in our laboratories -- you won't be able to buy it in a store -- but the descriptions should be good enough to be used for another generic board.

Another good reference is this book, where basic electronics is explained with the help of Logisim.

To import directly logisim-evolution in Eclipse, you can use Eclipse's import wizard:

Import -> git project -> [put the connection details] -> New project -> Java project from Ant

You will, however, encounter a problem when you will try to execute the code. In particular, an exception ExceptionInInitializerError will be thrown. To solve this, execute the eclipse_fix.sh script in the program's directory, or go in the bin/ subdirectory and create links to the following directories available in the program's directory

• boards_model
• javax
• libs
• resources
• doc

We cannot assure retro-compatibility of logisim-evolution with files created with the original Logisim. We have incorporated a parser that alters the name of the components to satisfy VHDL requirements for variable names, but components evolved in shape since then (think, for instance, to RAM and counters). You might need to rework a bit your circuits when opening them with logisim-evolution -- but the changes will be stored in the new format, therefore you have to do your work only once.

Logisim-evolution is a continuously-growing software, and we have several ideas we would like to implement. In particular, we would like to have

• unit tests for the code
• extensive documentation
• test circuits
• ... If you are willing to contribute with any of these, please feel free to contact us!

Unfortunately, we do not have enough resources to provide direct support for logisim-evolution. We will, however, try to deal with the raised issues in a best-effort way.

If you find a bug or have an idea for an interesting feature, please do not hesitate to open a ticket!

The code is licensed under the GNU GENERAL PUBLIC LICENSE, version 3.

The following institutions/people actively contributed to Logisim-evolution:

• Carl Burch - Hendrix College - USA
• Haute École Spécialisée Bernoise - Switzerland
• Haute École du paysage, d'ingénierie et d'architecture de Genève - Switzerland
• Haute École d'Ingénierie et de Gestion du Canton de Vaud - Switzerland
• Theldo Cruz Franqueira - Pontifícia Universidade Católica de Minas Gerais - Brasil

If you feel that your name should be in this list, please feel free to send us a mail!

• Logisim by Joseph Lawrance et al. (link) - they have started from Burch's original code and integrated it in several open-source development frameworks, cleaning up the code. We have taken a few code cleanups and the redo functionality from their code.
• logisim-iitd (link) - IIT Delhi version of Logisim, it integrates the Floating-Point Components within the Arithmetic Unit.
• Logisim for the CS3410 course, Cornell's University (link) - they have a very interesting test vector feature, that has only recently integrated in logisim-evolution.