Why use a Mega when the DUE is out now? The DUE has oodles of ram, as well as having a native CAN bus. It'd make an awesome ECM.

That sounds really cool. Post a link when you get that working!

A lot has changed in the year since this was first posted. Lately, I've been thinking about designing an "EFI Shield" for the Arduino DUE. The processor in the DUE is way more capable than any of the chips the MegaSquirt has used, and has native CANbus, so it'd make for an excellent base for a fuel injection controller. Not to mention the price.. $50 for a DUE, I think an EFI shield could be done for around $50-$75 (board plus BOM). Finally have a truely open source fuel injection controller. Way beyond my programming skills, but maybe if the hardware existed, others would join in on the project.
And yeah, not a piggyback, I'm talking stand alone engine management. Fuel, spark, boost, run the whole show..

Should sell them on Tindie, I bet they'd be popular. I love the ATTiny chips, so versatile, and CHEAP.

I saw a video on YouTube where it appears someone has this working on the Due. Has anyone tried it on the Teensy 3.0 yet? I'd imagine the Due and Teensy3 could decode an actual WAV file..

eried: That is an ENC28j60 chipset, not a Wiznet. It will gobble up the ram on an Uno like nobodies business, and the standard ethernet library doesn't support it AT ALL.
BTW: If you think the ethernet is expensive, look at the WiFi.. EeeGads.. I suppose if you HAVE to prototype a WiFi setup... Remember the Arduino is just an educational/prototyping platform. Prototyping is generally always more expensive than mass production, even if this is prototyping on a mass scale.

4-5v power source. I've been running one of them off a LiPo battery pack, the one on my tree uses an iPhone charger and a chopped up USB cable.. a 4 AA battery holder works well with NiMH batteries in it, too.

I'm selling them assembled, mostly due to the tiny SMD components. It's also a real pain to get the polarity correct on all the LED's.. I'd say I had a 30% success rate in the 10 boards I assembled. Luckily I have a hot air rework station, so flipping them around after getting them wrong isn't too big of a deal for me. I had the boards produced by iTead, they were pretty quick, and put up with me not having a clue how to make proper gerber files, as well as selecting the wrong size board.

This is one of my first PCB designs I've done. It uses an ATTiny45 to drive 20 individually adressable charlieplexed LED's. I made the PCB in the shape of a Christmas tree and it hangs on a Christmas tree as an ornament. A terribly GEEKY one.

I have more details on my website. Just thought I'd share with everyone here. I doubt I'd have been able to build this without the skills and knowledge that I've picked up because of Arduino.

If you do re-do it, should toss in the ethernet jack while you're in there. How different is the pinout between the 3X and the 3U?

Looks like a good opportunity for a third party vendor to create a board using the Due's chip, but wired up for the hardcore extreme user. Rather than cloning the Due, it'd be an innovative evolution.

Downloading it now. I'm trying out the Mac version. I'll give it a try for a few days and report back. Thanks for taking the time to do this.

Well if the improvements don't make it into the final 1.5, I'm sure those guys will apply them to 1.5 afterwards, like they did with 1.0.2..

Check out this improved 1.0.2 IDE: http://arduino.cc/forum/index.php/topic,118440.0/topicseen.html
You'd think they'd roll those improvements into the new 1.5 IDE, but I guess not. Can lead a horse to water, can't make him drink....

I'd try running the leads to the motor through a ferrite bead. Go through the bead, loop back around and go through again, then back to the motor (or power source, depending on the side of the bead). Those are supposed to help with interference issues.