The Thurber Feeder 5000 Helps to Slow Fido Down

Does your dog eat too fast? [Thurber] does, and he even chokes occasionally while snarfing down the kibble — naturally this worried his owners, so [Jason] stepped up to the challenge to slow him down. Introducing the Thurber Feeder 5000.

[Jason] is a seasoned maker, and has built a few CNC machines in his day — he’s even automated an Etch a Sketch with stepper motors. Making the Thurber Feeder 5000 was a piece of cake. He designed the entire thing in 3D CAD and then used his home-made CNC machine to cut out all the parts, 3D printing a few of the more complex mounting brackets.

It’s a fairly simple device consisting of a food hopper (seal-able to keep Thurber away), a stepper motor and an auger bit borrowed from a chocolate fondue fountain. The stepper goes through a 6:1 belt pulley ratio which gives it a whopping 200 oz-in of torque to push those kibbles and bits through the feeding pipe. The speed is adjustable by programming the Parallax Propeller, so once they found an acceptable eating speed [Jason] set it as default. A single button turns it on, and while the machine is running it lights up — turning off when little [Thurber] is done.

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Hackaday Links: July 20, 2014


Etch-a-Sketch spray-painted silver with electronics bolted onto the side? Sign us up! This art installation adds one thing that we don’t often see in these types of hacks, eerie audio.

If you’re still mining bitcoin you need to do it faster than anyone else… that’s pretty much how the whole thing works. [Lewin] has been using the Antminer USB ASIC and toyed around with overclocking to 2.2 GH/s (gighashes per second) but to make sure his hardware holds up to the overwork he hacked his own water cooling system for the dongle.

Smart phones are the best bang for your buck on portability and power. Better yet you can get slightly broken ones for a song. If you manage to find an Android device with a broken touch screen but functioning LCD try this trick to add a mouse to it. There must be another life for this in a future hack!

We have a love-hate relationship with this particular crowd-funding campaign. First this hate: It’s basically a 100% clip-art video presentation with an $800,000 ask. Yeah… good luck buddy. On the other hand, this is the type of stuff we actually want to see as crowd funding. The idea is to use modern materials and techniques to build [Nikola Tesla’s] Wardenclyffe Tower, which was designed and built to research wireless energy (both as a means of communication and actual energy transfer). It was never fully functional and ended up being demolished. Wouldn’t it be great if teams of highly skilled and motivated people took grand ideas like this, crossing every theoretical “t” and dotting every theoretical “i”, and then proposed a crowd funding campaign to build a test platform? Oh wait, that sounds very much like a government research grant. Anywhoo… check out the Global Energy Transmission’s campaign.

Isoscel-Ease Drawing Robot is Mesmerizing

Isoscel Ease Drawing Robot

Drawing is difficult for a lot of people… So, why not build a robot to do it for you? [Darcy] had an idea for a rather unique drawing robot — he calls it the Isoscel-Ease.

Instead of using a boring XY gantry, a deltabot, or using a scissor linkage (actually that one is pretty cool!), [Darcy] decided to try harnessing of the power of triangle geometry! As you can probably guess, the linkage forms an isosceles triangle, hence the name. A pair of stepper motors increases and decreases the odd side of the triangle, allowing for a full range of continuous inky movement (there’s no pen actuator) over the page.

It’s a very cool little drawing robot, and it was completely designed in SketchUp — He has lots of photos of the build process and example drawings on his site — But don’t forget to stick around after the break to see a video of it in action!

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Laser Cutter Becomes An Etch A Sketch


The mirror in a laser cutter moves along an X Y axis. An Etch A Sketch moves its stylus along an X Y axis. Honestly, this laser cutter with Etch A Sketch controls is so obvious, we’re shocked we haven’t seen it before.

The Etch A Sketch interface is extremely simple – just two rotary encoders attached to laser cut knobs set inside a small, laser cut frame. The lines from the encoders are connected to an Arduino Pro Mini that interfaces with the controller unit on the laser cutter, moving the steppers and turning on the laser only when the head is moving. There’s an additional safety that only turns on the laser when the lid is closed and the water pump is running.

The circuit is extremely simple, and with just a few connections, it’s possible to retrofit the Etch A Sketch controller to the laser cutter in just a few minutes.  Just the thing for a weekend hackerspace project.


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Tiny OLED o-scope fits on a breadboard

With a surplus of 3D printers at this year’s Maker Faire, it’s really surprising to see the most talked about tool among the makers is a simple oscilloscope.

[Gabriel Anzziani]’s Xprotolab is an extremely small oscilloscope, function generator, logic analyzer, and general 128×64 OLED display is the perfect addition to your next prototyping project. With its breadboard friendly format and USB output, it will dutifully serve as a 200kbps oscilloscope, 8 channel logic analyzer, or as seen in the video above, the perfect interface for a Wii Nunchuck or just a simple digital Etch-a-sketch.

In the video above the fold [Gabriel] shows off the functions of his tiny, if somewhat limited, OLED oscilloscope.

Your mug on an Etch a Sketch — automatically

[Jim’s] pretty serious about his Etch a Sketch. He’s gone to the trouble of building a rig that will automatically render a photograph as Etch a Sketch art. Do you recognize the US political figure being plotted in this image? He actually cracks these open and removes all of the internals to preserve the artwork when the reassembled body is ready to be hung on a wall. But we like it for the hacker-friendly interface techniques he used.

He moves the knobs using a pair of stepper motors. They attach thanks to a pair of 3D printed gears he modeled which go over the stock knobs and secure with four set screws. He says he can be up and printing in five minutes using these along with the MDF jig that holds the body and the motors.

He converts photos to 1-bit images, then runs them through ImageMagick to convert them into a text file. A Python script parses that text, sending appropriate commands to an Arduino which drives the motors. The image is drawn much like a scanning CRT monitor. The stylus tracks one horizontal line at a time, drawing a squiggle if the pixel should be black, or skipping it if it should be white.

We wish there was a video of the printing process. Since we didn’t find one, there’s a bonus project unrelated to this one after the break. It’s an Etch a Sketch clock.

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