Desktop Sized Tamagotchi Is Even Harder To Ignore

April 13, 2014 by 5 Comments

desktop tamagotchi

[Vadim] was feeling a bit bored at work one day and dreamed up this rather odd project. He had a spare LED matrix handy, and thought, “I should build a giant Tamagotchi…” and so he did.

In case you’re not aware, Tamagotchi’s were digital pets introduced in the late 90’s. You had to feed them, play with them and even train them — attempting to teach the responsibility of having a real pet. It was a bit of a fad, and to be honest, they were really quite annoying — but that didn’t stop [Vadim] wanting to make his own!

He’s using an ATmega328P with the Arduino boot loader at the heart of this project. The LED matrix is made of a group of four 8×8 LED modules with four shift registers (74HC595) and two Darlington transistor arrays to take the current — This is because the 256 LEDs need to be multiplexed down to 32 IO’s (16 rows + 16 columns).

Once the hardware was all done, he started coding — he’s actually coded the entire game from scratch, and while it’s not that complex it’s still an impressive amount of effort that went into this desktop sized Tamagotchi!

To see it in action, stick around after the break.

Continue reading “Desktop Sized Tamagotchi Is Even Harder To Ignore” →

Printing In Three Dimensions, For Real This Time

April 13, 2014 by 37 Comments

topo

3D printers don’t continuously print in three dimensions – they print one layer, then another, then another. This is true for every single 3D printing technology, but now Topolabs has a very interesting technique that changes that. They’re printing in three dimensions by moving in the Z axis while also printing in the X and Y axes.

The basic idea behind Topolabs’ software is to print a support block, then print an object right on top of the support. The support block can be curved and convex, and the finished product follows the contours of the solid support block. Unlike ‘printing with supports’, the printer extrudes along the X, Y, and Z axes, which should make the finished product much, much stronger.

There are a few drawbacks to the technique – a release agent must be applied to the top of the support block. In the video below, Topolabs is using Kapton, but hair spray or glue sticks will also work. There’s also a limit to how steep an incline a printer can print, determined by the size of the extruder nozzle. Lastly, this technique would be much better suited for a delta-style bot, but the team is getting very good results with a normal Cartesian bot.

You can see a few videos of the Topolabs printing technique below.

Continue reading “Printing In Three Dimensions, For Real This Time” →

The Ultimate Workstation That Folds Up

April 13, 2014 by 19 Comments

ultimate maker station

Looking for an easy way to keep on making stuff even though you’re living in a tiny dorm room? [Matt Silver] was tired of not having a dedicated work-space, so he spent some serious time designing this modular, re-configurable and collapsible portable workstation ready for almost anything.

He started out by sketching ideas, playing around with 3D models in SketchUp, and eventually building a few prototypes using trial and error — and what he’s come up with is pretty darn impressive. It folds down to just under a foot by three feet squared and has casters to roll it around. Once unfolded, you stabilize it by placing your chair on one of the walls that folds down, and the desk itself is also re-configurable for different work surfaces. He’s included a power bar, an LED work-light, and it even has storage racks for tools on the side.

It’s a very thorough Instructable, and definitely worth a look through — especially to see how it magically unfolds! And if you’re wondering about how much it would cost to build, you’re probably looking at around $200 depending on what you already have on hand. What we really like is how it’s almost entirely made out of a single 4’x8′ panel of plywood — it’s like this guy works for IKEA or something!

Sewing Conductive Thread In Parallel Lines

April 12, 2014 by 5 Comments

[Cynthia] has shared a great video of  machine sewing parallel lines of conductive thread onto ribbon using a cording foot which usually comes standard with most machines. This technique could be particularly useful when using addressable LEDs like a NeoPixel to get the ground, data, and positive lined up fairly accurately. Sewing the conductive thread onto ribbon also makes it a hell of a lot easier to attach to many garments or textiles,  and also makes it easier to replace or reuse.

The method is pretty easy, essentially using the grooves in the cording foot to guide the conductive treads and ensuring even spacing. Two of the lines are sewn down approximately 3 mm apart using a zigzag stitch. The third line is sewn separately making sure the stitching doesn’t break the first two lines. In the video, a striped ribbon is used which has slight troughs that additionally helps the threads stay in place and the sewer to stay on target.

[Cynthia] of Cynthia Designs Studio has been experimenting with embedding electronics in textiles and has quite a few great videos that you can check out on the Cynthia Designs Studio YouTube channel.

We have seen a machine embroidered LED matrix and a hand sewn LED quilt here on Hackaday, but those who have tried know that conductive thread can be very tricky to work with and keep conductivity.  Do you have any tips or tricks for hand or machine sewing conductive thread? If so, please share in the comments below.

Continue reading “Sewing Conductive Thread In Parallel Lines” →

Turn Your Drill Press Into A Bobbin/Spindle Sander

April 12, 2014 by 18 Comments

drill press ander

Drill presses are a staple tool of the typical garage — they aren’t too expensive and are indispensably useful — but have you ever thought of turning it into a spindle sander?

You can buy drum sander kits fairly cheap, but the problem is they’re really difficult to use and really messy too — you’ll have sawdust everywhere in no time. What [Carl’s] done here is created a wood box for his drill press with different size holes for each drum sander bit. By attaching a vacuum cleaner to the box, you can clean up your mess while you’re still doing the work.

Just a note — drill presses aren’t designed to take radial loads like a mill is. If you’re planning on doing some really heavy sanding, adding a bolt through the entire drum sander bit and then coupling it with a fixed bearing inside of your box might be a good idea.

It’s a pretty simple hack, but could save you an additional power tool, and space on your work bench! Have a drill but no drill press? No problem.

 

A Virtual Cane For The Visually Impaired

April 12, 2014 by 31 Comments

[Roman] has created an electronic cane for the visually impaired. Blind and visually impaired people have used canes and walking sticks for centuries. However, it wasn’t until the 1920’s and 1930’s that the white cane came to be synonymous with the blind. [Roman] is attempting to improve on the white cane design by bringing modern electronics to the table. With a mixture of hardware and clever software running on an Android smartphone, [Roman] has created a device that could help a blind person navigate.

The white cane has been replaced with a virtual cane, consisting of a 3D printed black cylinder. The cane is controlled by an ATmega328 running the Arduino bootloader and [Roman’s] code. Peeking out from the end of the handle is a Maxbotix ultrasonic distance sensor. Distance information is reported to the user via a piezo buzzer and a vibration motor. An induction coil allows for charging without fumbling for tiny connectors. A Bluetooth module connects the virtual cane to the other half of the system, an Android phone.

[Roman’s] Android app runs solely on voice prompts and speech syntheses. Navigation commands such as “Take me to <address>” use the phone’s GPS and Google Maps API to retrieve route information. [Roman’s] app then speaks the directions for the user to follow. Help can be summoned by simply stating “Send <contact name> my current location.” In the event that the user drops their virtual cane, “Find my device” will send a Bluetooth command to the cane. Once the command is received, the cane will reveal its position by beeping and vibrating.

We’ve said it before, and we’ll say it again. Using technology to help disabled people is one of the best hacks we can think of. Hackaday alum [Caleb Kraft] has been doing just that with his work at The Controller Project. [Roman] is still actively improving his cane. He’s already won a gold medal at the Niagara Regional Science and Engineering Fair. He’s entered his project in several more science events, including the Canada Wide Science Fair and the Google Science Fair. Good luck [Roman]!

OLED display, blue LED and Smartcard

Developed On Hackaday: The Top PCB Dilemna

April 12, 2014 by 15 Comments

The Hackaday community offline password keeper is slowly coming together. A few days ago we received the top PCB for Olivier’s design (shown above). If you look at the picture below, you may see the problem we discovered when opening our package: the soldermask was the wrong color! Given the board is meant to be placed behind a tinted acrylic panel, this was quite a problem…

After using some spray paint, we managed to get to the point shown in the bottom left of the picture. The next task was to find the best way to illuminate the input interface with reverse mount LEDs. Using a CNC mill we machined openings (top right PCB) but also removed some epoxy on both PCB’s sides, thinking it would provide a better light diffusion. We then wrote part of the Mooltipass PWM code and took these pictures:

Continue reading “Developed On Hackaday: The Top PCB Dilemna” →