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A friend of mine found Logisim the other day and pointed it out to me - it's fantastic! I really appreciate its stability and elegant simplicity.
I teach a Computer Organization class that covers the basics of Digital Logic with the caveat that students never get to physically wire up a circuit. When I saw Logisim I quickly rewrote one of my assignments to use it (http://www.egr.nau.edu/~ap27/cs200/proj5.html) and I feel like my students are going to get a much better experience out of this segment of the course than they would have otherwise.
A couple of random thoughts:
- It seems odd that 2-input gates aren't available. Not a big deal though.
- Some years ago I used "Dia" to draw resistors and voltage sources while teaching an electrical engineering course. The program left a bad taste in my mouth because it crashed frequently and it seemed overly hard to align things sometimes. Logisim does neither. A lobotomized code branch of Logisim that draws EE parts - never mind any simulation - would be pretty nifty IMO. Disclaimer: I haven't used Dia for years or investigated that scene recently.
Thanks for the great program and I'll definitely be recommending it to the people I know!
Thanks for the kind words. And I hope it works well in your course; the assignment writeup certainly looks nice.
Two-input gates are a perennial complaint. I imagine that you already figured this out, but I want to mention it because this comes as a shock to people accustomed to using breadboards: If you have a logic gate with multiple inputs, you can just leave some inputs unconnected, and Logisim will ignore those inputs.
You idea of having a library for non-working electrical symbols is an intriguing thought. Others have suggested adding such components, but I've always discarded it since the simulation is completely infeasible given Logisim's architecture; it didn't occur to me that the drawing ability alone has some value. (Incidentally, I think there is an open-source project called QUCS that works on simulating circuits.) I don't see that it would require a branch, though: Logisim currently has an ability to incorporate additional libraries written in Java. And if somebody develops a particularly solid library, I'm open to incorporating it into Logisim as a built-in library.
When making sub-circuits, it would be pretty useful if any LEDs or 7 segment displays that were used in the sub-circuit would appear as part of the component symbol.
Also, dual-color LEDs would be nice.
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