Heat-seeking Firebot Drowns Out The Flames

November 10, 2012 by Mike Szczys 10 Comments

This robot can find and extinguish fires automatically. It is the culmination of an Embedded Design class project from last school year. [Dan] and his classmates developed a turret that holds both a spray nozzle and heat sensor which would be a fantastic building block for a real-life tower defense game.

The jewel of the sensor array is a TPA81 thermopile array. Note the use of the term ‘array’ in the name. This is more like eight temperature sensors aligned with each other. By monitoring them all, the direction from which the most heat is coming can be determined. Once it’s zeroed in on the fire getting water to the right place can be a difficult task. That’s where the other sensors come into play. An accelerometer allows the bot to determine the angle of the spray nozzle (a weed sprayer was used in this case). An ultrasonic range finder and few algorithms let the Arduino which drives it all make sure that the arc of the water lands on the hot spot. This is all shown quite clearly in the clip below the jump.

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A Collection Of Hands To Inspire Your Halloween Animatronics

October 29, 2012 by Mike Szczys 3 Comments

Jump scares are a lot of fun, but if you want to hold the attention of all those trick-or-treaters we’d suggest a creepy prop. One of the best choices in that category is a ghoulishly lifelike hand. You can draw some inspiration from this roundup of robot hands which Adafruit put together.

We’ve chosen four examples for the image above but there are more to be had than just these. In the upper left there is a laser-cut acrylic hand that actually features some force sensitive resistors on the fingertips to help implement some haptic feedback. This project was inspired by the hand seen in the lower right which uses flex sensors on a glove to control the bot’s movement. If you’re looking for something more realistic the 3D printed parts on the lower left are the best bet. But if you’re looking to put something together by Halloween night the offering in the upper right is the way to go. It’s hacked together using cardboard templates to cut out plastic parts and using polymorph to form joints and brackets.

DARPA Funded Robot Ninja Warrior?

October 26, 2012 by Mike Szczys 23 Comments

Fans of the game show Ninja Warrior will immediately recognize the similarity of this test apparatus as the Spider Climb. Of course that’s not a human contestant, but a humanoid robot developed by Boston Dynamics. And it’s not actually clinging to the vertical walls as its only support. There are two narrow ledges to either side on which its feet gain purchase. Nonetheless this is some impressive work to keep itself upright and avoid slipping. Check out the video after the break to see how it does.

The sheer volume of amazing robot tech that this company spits out is remarkable. Just last month we saw the robotic cheetah which can run at almost 30 mph. We don’t expect to see either in the wild anytime soon, but especially this humanoid. you’ll notice the red rings positioned around the apparatus. We believe these are high-speed cameras set up to give the robot positional feedback and we’d wager it can’t perform without them. But that’s merely conjecture so judge for yourself.

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Battling Most Useless Machine Gets An Expressive Upgrade

October 22, 2012 by Mike Szczys 21 Comments

We suppose the only thing more useless than a most useless machine is giving it an emoticon face. But that’s exactly what has happened with this project. But you’ll want to seen the whole thing, as the presentation involves much more than an angry box that can shut itself off.

This is the second iteration of the angry box. As we saw about 18 months ago, it will eventually get fed up with you turning the switch on and freak out by driving itself all over the desk. This version starts off with a rather pleasant face drawn on the red LED matrix which takes up the front side of the enclosure. It will nonchalantly flip the switch to the off position after first being activated. But if you insist on turning it back on things get angry rather quickly. This is shown in the video after the break. But if you can get past the horrible machine translation there are some build details to be had in this post.

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Robot Performing A Tightrope Act

October 19, 2012 by Mike Szczys 21 Comments

This robot is able walk the tightrope (translated). Well, it’s more of a shuffle than a walk, but still a lot better than we could do.

In the video after the break you can see the bot starting on the platform to the right. As it steps out onto the wire (which rides in a groove on the bottom of its foot) the robot spreads its arms to help maintain balance. When the other foot leaves the platform that is the last stride we will see until it reaches the other side. The rest of the act consists of sliding the feet a little bit at a time until it gets all the way across.

[Dr. Guero] has been working on at least one other balancer as well. Also embedded after the break is a robot riding a bicycle. It actually puts a foot down when stopped, and gives a stuttering push-off to get going again. This guy would be right at home riding past you in the hallways of the Death Star.

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Tank Tread Robot Build Aims For A Smooth Ride

October 17, 2012 by Mike Szczys 23 Comments

There’s all kinds of interesting things going into this tank robot build, but that beautiful suspension system immediately caught our eye. It helps to protect the body of the robot from being shaken apart when traveling over rough surfaces. Make sure to check out the four parts of the build log which are found on the left sidebar at the post linked above.

This a Master’s thesis project and has been built from common parts. The motors for the treads are pulled from a pair of cordless drills, with some capacitors added to help combat the draw when they start up. The treads themselves are each made from a pair of bicycle chains connected with numerous PVC pipe segments. The curved section of each PVC piece goes toward the chain, leaving the edges toward the ground for great traction. The tree wheels which support the middle of the tread each have a hinge and spring to absorb the shock of running full speed into concrete sidewalk corners like we see in the video after the break.

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Controlling A Robot With Your Mind

October 15, 2012 by Brian Benchoff 16 Comments

For [Ern]’s MEng group project, his group had to develop a robotics platform capable of achieving some end goal. Because innovation is a large part of the grade, [Ern] convinced his team members to work with a brain controlled interface and build a mind controlled robotics platform.

For wont of having an easy build, [Ern] and his team chose a Lynxmotion Tri-Track robot capable of moving around the classroom while receiving commands from a computer. The mind-control portion of the build comes from a NeuroSky MindWave Mobile, a cheap and fairly open EEG system that reads alpha, beta, and delta waves generated by a user’s brain and sends that data over to a computer for processing.

After a bit of testing that included an Arduino to move the robot forward if the MindWave’s ‘attention’ value was over 60%, [Ern] and his team looked for a way to implement multi-directional control.

In order to get the robot moving left, right, and backwards in addition to moving forwards, the team looked at the included ‘blink detection’ abilities of the MindWave to cycle through a few commands. This technique turned out to be far too sensitive – the blink detection of the MindWave is simply too good. To get around that problem, the team used the signal strength of the received EEG signals. The theory being when a user blinks their eyes, the EEG contacts will move slightly, degrading the signal received by the hardware.

The team finally got a reasonable mind-controlled robot up and working, as demonstrated in the video after the break. Check out how each blink allows [Ern] and his colleagues to cycle through driving modes. Pretty neat for controlling something with your mind.

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