Category Archives: DIY

Breaking In to your Own Devices

I gave an informal talk for the IEEE student branch about breaking in to your own devices this evening. I did the low-postable-content notes with live examples and links thing, but at least one person wanted to watch the video links, so here are the notes. There is something delightful about giving talks that require legal disclaimers. I don’t think there is anything in here that will get me in trouble…

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RFID Exploration

I recently picked up a USB RFID reader/writer pod to play with, partly to learn enough to be dangerous about the tech, and partly hoping to tamper with the RFIDs in the current university ID cards. I’m pretty sure I failed on the latter point, but am succeeding at the former in the process.

RFIDKit

Notes from the first round of fiddling with it follow.

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New Chorder

I’ve been playing with chorded input devices for years, and got the itch again recently.

CNChorder
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3D Printing KC Talk

I gave a quick primer on 3D printing as a Keeping Current (CS departmental) seminar yesterday.

It’s not a great standalone deck but posted (in reduced quality, gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=/path/to/output.pdf /path/to/input.pdf is good magic).

It seemed to be well-received, printed objects were played with, thoughtful questions were asked, I think this is the first time I’ve given a 3D printing primer to a wider group and not been asked the “guns” question.

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Lab Fridge Repair: Thinking with 3D Printing

I’m posting this because it’s such a nice example for the standard “What are 3D printers really good for?” question.

When I got to the lab today, I was told the can chute in our mini-fridge was broken. Inspection showed that too many of the little plastic inserts/bushings that retain the bars were missing and/or broken. This is a years-old cheap GE minifridge, so it isn’t even worth looking for OEM replacements.

Now we get to the “Thinking with 3D printing” part: I plucked one of the remaining ones, went over it with some calipers, transferred the measurements into OpenSCAD, and printed one off to test fit. The ID was a little tight, so I adjusted the model, printed 6 more, and fixed the problem.

In case the model is useful for anyone else: OpenSCAD and STL.

Important Details:

  • This took like an hour from start to finish, and wasn’t the only thing I was doing at the time. The printing itself was around 1 minute per insert.
  • The new inserts are better than the originals. Not quite as pretty in some ways (though they are blue and glow-in-the-dark, because that’s our current junk filament), but the fit is considerably better.
  • That “iterate” step in the middle, where you just try it and adjust if needed is among the most beautiful things about 3D printers.
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T510 Touchpad Resurfacing

TPReplaced

I found a forum.thinkpads thread while looking into another touchpad issue recently, and learned two important facts:

  1. The bumpy touchpad texture I never loved that had worn off my T510 is just a sticker.
  2. Those stickers are replaceable.

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Singer no.42 Swingarm Repair

I’ve posted before on the slow restoration of my old 201-2 and its cabinet, last time I noted that my cabinet’s swing-arm wouldn’t auto-deploy, which prompted some discussions with other folks about the mechanism. One of those other pieces of input was someone kind enough to tip me off in the comments of my last note about this that there were a couple sets on ebay, which I looked at for details, then ended up buying one of for $22 shipped. I really only needed the lower pin and spring, but the spares are nice. This is what the seller pictured, and the light and camera are better than mine, so I’ll just use their picture, because it was well packed and exactly as described:

SingerSwingarm

I now have mine working and have detail photos and measurements from the process that should make it easier for others to figure these things out. It’s actually a really simple mechanism, the following two pictures are pretty much all you need to know about how it goes together and works.
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Inspiron 11-3000 Hinge Screw Defect

Inspiron113000Hinge

The Inspiron 11-3000 I’ve been carrying around developed a rattle the other day, and today I decided to open it up.
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New Data Integrity Tools

I’ve recently added a couple tools to my standard set, and have at least a 4x improvement in the safety of my data by doing so.

The process was complicated a bit because I’ve become very sensitive about only depending on FOSS tools (ex:As much as I like SublimeText2, I stopped using it because it once demanded to be updated before it would run.), but frankly I think that constraint produced better results than I would have reached without it. Because it was something of a hunt, I’d like to recommend the particular tools I settled on, in particular are KeepassX, Attic, and Seafile, described individually below.
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Quick Laptop Sleeve

HalfIn
I noticed I was scuffing up the not-my-laptop that I’ve been carrying, so I did a little “30 minute” sewing project (that actually took over an hour because I’m apparently retarded) after I burnt out on other things for the evening.

The intention is a little sleeve that will be snug enough to retain the laptop, and let me slide it between [note]books, etc. in a bag. That means a little long, with thick hems on the open end for retention, and no flaps, fasteners, or protrusions to hang up on other things in the bag.
Basically, I measured the wrapped length and width of the machine (to accommodate for thickness), cut a piece of fabric I had around to the full wrapped long dimension (+1.75″ for hems and clearance) and half the wrapped short dimension (+1″ for seams), hemmed the short ends, folded it in half, ran a seam down the sides, half-assed wrapped the first 2″ of each side seam, and called it adequate.


Upside:

  • I can still sew well enough to go from conception to part on something trivial almost instantly.
  • My neglected sewing gear is still in working order.
  • My vintage sewing machine got her recommended periodic exercise and lube.
  • The finished product is functional and looks fine.

Downside:

  • I initally cut the circumference of the machine … in both directions. 1.9 sleeves worth of fabric!
  • One day, I will sit down in front of a sewing machine and thread it the right direction the first time. That day was not today. Bobbin thread/direction? -Easy. Complicated path through the tension and take-up? -Easy. Passing the right way through the needle? -Derp. I’ll claim it’s the Singer vs. White thing if challenged.
  • I had to look it up and still managed to use the adjustable hemmer wrong in two different ways, one hem failed to fell, the other is not really straight.
  • I added allowance for generous 1/2″ seams intending to cut after … then sewed 1/4s and had to redo the side seams to make it snug enough.

Using my venerable old machine always makes me feel like it and 3 generations of my family are judging me when I do something inept or half-assed on it, which probably makes my projects better.

I think I’m satisfied. I’d like it to be just a hair snugger, but the fit is pretty good and snugger would have run the risk of finishing then not being able to get the machine in. I think I want to make some kind of companion pouch for the power brick, but I’m not sure how, an attached pocket would ruin the slip-between-things-in-my-bag functionality.

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