Creating A Voice Controlled Robotic Arm

October 19, 2011 by Mike Nathan 11 Comments

robotic_arm_voice_control

[Arthur] was laid up with a wrist injury, so he decided it would be a great time to hang out around the house and tinker with electronics, since most outdoor activities were out of the question. He picked up a robotic arm kit and assembled it to test out some code written for it that he found online. Since typing commands into a terminal was awfully cumbersome considering his injury, he figured he might as well construct a voice control system for the arm.

He documents his work in a three part series, covering the process from concept to completion. The first part centers around the creation of the vocabulary and grammar for the voice recognition system, along with the how the grammar model was trained using voice samples.

The second and third portions of his tutorial deal with the software’s decoding of his commands and the Python scripts used to translate those commands into something the robotic arm can process.

[Arthur’s] voice control system works pretty well as you can see in the video below, though he already has a wish list full of improvements he hopes to make in the near future.

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Years Of Robotic Projects – Dumped For Your Enjoyment

October 18, 2011 by Mike Szczys 7 Comments

Meet tippy, just one of the multitude of robotic projects [Oneironaut] has taken on over the years. He ‘dug deep’ and put together a huge data dump of pictures and descriptions of his old robotic projects, then posted them for your enjoyment. When he wrote in to Hackaday on Monday he mentioned 33 pages of them, but he must be adding material as he finds it because we see 52 pages.

These aren’t micro-robots either. These are I’m going to chase you down because I’m your worst nightmare robots. They use heavy welded-iron frames, lead-acid batteries, and gear-motor driven locomotion. Some of his project names include The Tank, The Sentinel, and The Megatron. Bookmark the link you see above, because you’re going to want to spend some time sifting through the candy-shop of projects which seem to be too plentiful to be the hobby of just one man. Although we shouldn’t be surprised, just look at the multitude of spy-gadgets he’s come up with lately like the GPS tracker and the long-range laser night vision.

A CD Changer Made Of Wood

October 18, 2011 by Jeremy Cook 15 Comments

Although this is by no means a new hack – it was made circe 2002 – this wooden CD changer is an interesting piece of machinery. The whole thing is a simple pick-and-place device. The gripper is brilliant in it’s simplicity, using only a rubber band, wood, and a solenoid. It grips the CD by the middle hole, picks it up, and the assembly then travels to the CD tray or the stack. Everything works with DC motors and string, and several micro-switches make sure everything is picked up and dropped in the correct position.

Although we may think this is a pretty cool device, [Matthias] is quite humble about his machine’s abilities. In his estimation, although one could probably duplicate 12 CDs with relative ease, if you really wanted to duplicate a large number, it’d be best to buy one. Maybe he works in manufacturing.

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Small Tabletop Telepresence Robot

October 16, 2011 by Mike Nathan 12 Comments

iphone_tabletop_telepresence

When [Peter] saw the Sparkfun Magician robot chassis in a recent new product post, he knew instantly that he had to have one for a telepresence project that had been kicking around in his head for a while.

Onto the robot chassis, he added an Arduino to provide the brains of the bot, an Adafruit motor shield for controlling the wheels, and a Pololu Wixel for wireless communications. An iPhone is mounted on the top of the robot, which communicates with his laptop using Apple’s Facetime app. The robot is controlled from his laptop as well using the Wixel, which enables him to direct the Magician chassis as if it was attached via USB.

While he thinks the robot is pretty neat and that it works well, [Peter] already has improvements in mind. The robot chassis is a bit weak on anything but smooth surfaces, so a new set of motors and wheels are likely the first changes he’ll make. He wants to add a servo-based aiming mechanism for the phone’s camera, as well as some sensors to prevent the bot from taking a nosedive off his table.

iPhone aside, this is probably one of the cheaper mobile telepresence setups we’ve seen, so we can’t wait to hear how the improvements work out, and how much they add to the robot’s cost.

Genetic Testing With Lego

October 11, 2011 by Brian Benchoff 7 Comments

From the dark recesses of the Internet circa 2009 comes the BioBrick-A-Bot, a liquid handling system for molecular biologists.

The 2009 iGEM competition was a student competition to build devices for synthetic biology. The BioBrick-A-Bot’s goal is to build a simple, low-cost liquid handling system that sucks liquids out of petri dishes and into vials.

Like most lab equipment, the commercial version of this tech is insanely expensive – about 10 grand for a commercial liquid handling robot. The BioBrick-A-Bot is made nearly entirely out of LEGO parts, so the cost of the entire system was brought down to about $700.

There are two main parts to the BioBrick-A-Bot. The Alpha module holds four pipette on a delta platform We’ve seen this type of robot built out of LEGO before, but moving liquids is new territory. The Phi module contains all the mechanics to suck microliters of liquid into a pipette and spit them out into vials.

The BioBrick-A-Bot didn’t win the 2009 iGEM competition (that honor was taken by students from ~~Heidelberg~~ Cambridge), but we’d take a LEGO robot any day of the week. Check out the demo after the break.

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Student Built Robot Chassis Has Something You Can Learn From

October 5, 2011 by Mike Szczys 27 Comments

This is a four-wheeled robot chassis built by high school students over the summer. They were participating in workshops put on by xbot robotics in Seattle, Washington. The goal is to get them participating in events like FIRST Robotics and LEGO league, and eventually into science related careers.

At first glance we thought: oh, that’s a nice chassis build… on to the next tip. But then the difference in front and rear wheel types caught our eye. The problem with four-wheeled designs is that you need differential steering to overcome the skidding issue when turning. This usually means two independently powered rear wheels and one unpowered front wheel that can swivel. One way to overcome this is to use three omniwheels, each with their own motor. And more recently we have seen four-wheelers that use mechanum wheels to get around the issue… but that takes four motors.

The design seen above uses just two motors, each with a chain to drive both wheels on one side. The rear wheels have rubber grippers which give them great traction. The front wheels are omni-wheels which allow them to move side to side easily during turns while aiding in forward progress when not turning. This gives the robot enough grip to push object around, like you can see in the video after the break.

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Robotic Arm Follows The Movements Of Your Own Limbs

October 2, 2011 by Mike Szczys 3 Comments

[Alejandro] and his friends recently finished a first prototype of scratch-built robotic arm. They’ve got some nice electronics bench equipment for use with a project like this, but for the actual fabrication work it’s off to the kitchen.

As you can see in the video after the break, they’re using PVC as the stock material in this build. Flat sheets are produced by slitting a PVC pipe down the middle, warming it in oven until soft, then compressing it between two floor tiles with a big jug of water used as a weight for the makeshift press. Mounting holes for the servo motors that make up the joints are drilled with a hand drill, and the assembly was affixed to an old CD as a base.

Once assembled they wired it to the control circuitry and build a set of sensors that you wear on your arm. Now your elbow, wrist, and pointer finger are in control of the servos. A demonstration of this functionality starts around two minutes into the video.

We’ve seen other examples of robot arms built without the use of machine tools. This arm made out of ShapeLock plastic is one of the most interesting examples.

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