Way back in July I thought I was almost done with the power monitoring box.

Well, it had some software issues and then got set aside for more urgent projects (like the makerbot – oh yeah!).

As a reminder, it’s built around an Arduino Duemilanove with an adafruit ethernet shield and an Xport module.

Tonight I wasn’t sleep-inclined, so I dragged it out and dug in. I ended up having to dig pretty deeply into the Xport configuration and learn more about how it works, which was a good thing in the long run.

The problem turned out to be an error in the Xport configuration that I had copied from an arduino example sketch. The owner of that example’s been notified, and my arduino code works, so it was a good evening of hacking.

The XPort module is a pretty powerful thing. Here are links to product information and the user manual (pdf)

The power monitor now PUTs a request to the web server as it should. There is still a bug on the server side, but it will wait until another day.

It’s been nagging at me that this got set aside, so now I feel better. I think I’ll go get some sleep.

It was a great day down at the space – including a visit from a bunch of people from Maker’s local 256. I’m sure we’ll find a lot to collaborate on.

I wanted to reciprocate and stop by their place on the way home, but evening arrived I realized that I’m being beaten by a cold of something, and headed home.

I’ve been painting and building the makerbot for a couple of weeks, and finally powered it up today. After fussing around with various versions of software for a while, I hit a mostly working combination, and printed this:

The Makerbot coin was the first object I printed

I’m having a few minor printing problems, but most of them can be tweaked out I think. The one that worries me is the periodic halting of the print for a second or so, which causes problems, and the occasional hard motion stop during printing – although the extruder keeps going.

But – not bad for the first few hours under power.

Makerbot batch 5 ships today, and mine should be in that batch! I already have several pounds of plastic waiting to be extruded. I’ll post build progress.

During a week of vacation, I made very good progress on the brother knitting machine file format.

The wiki page has links.

I’ve also started a python class to interface with these files. That class is read only at this point, but I am also playing with an application to program custom patterns, and that will require adding writing capabilities. Links to that software are also on the above page.

I am posting these now because I am coming up on a period of a few weeks when I may not be able to make much progress on this, and I wanted to go ahead and get it out there.

Enjoy!

While we were at NYC Resistor last month, Susan and I spotted a knitting machine. It turned out to be Bre’s Brother Electroknit model KH-930E. We ended up making a deal and shipped it home. Sadly, both ends of the machine took some shipping damage, but it’s still functional.

I’ve been hacking and reverse-engineering a bit since then, and I’ve written a python program which emulates the optional external floppy disk drive for the knitting machine. With access to saved files, I’ve begun cracking apart the file format used by the machine, and extending the information other people had already gathered.

I’m keeping the wiki updated here.

I will release the emulator program very soon. I’ve put in some new functionality and haven’t had a chance to test it with the knitting machine yet. As soon as that’s done, I’ll post it.

UPDATE:

The external floppy emulator is available, link is on the wiki page referenced above.

I’ve been working on an arduino power monitor for the Flying Monkey arts collective. I wrote about it originally
over here on my personal blog.

Arduino Power Monitor

It’s complete, and I think it’s functional. In order to do the final checkout, I have to put it on a wired net, as all that’s available here (at antitronics) at the moment is wireless.

I ended up finding arduino code that Maurice Ribble had written that was almost exactly what I needed, which made it very easy.

Provided that it works, the only remaining thing to be done before putting it into service is to check it against some sort of calibrated standard, or at least to use an accurate AC current meter to compare the output of the current probes with the A/D values that the arduino reads. It should be OK as the analog front end came out of another current monitoring project, but I need to check it.