At the MIX10 conference this past week, MAKE had a booth embedded inside the Coding4Fun exhibit. We showed off MAKE magazine, some of our Make: Books, and a few kits. Our Coding4Fun neighbors had a lot of great projects on display, including their Coding4Fun Cannon, which was a robotic t-shirt launching platform with two barrels. What's more, it was controlled by a Windows Phone 7 app, and they completed it in two weeks. Here's how Clint Rutkas of Coding4Fun described it:
Mid-February, we were asked to build a t-shirt shooting robot for the Mix conference on March 15th, 2010. This required us to pitch our vision and then research, build, test, and ship our project--all in about 3 weeks. After Scott Guthrie gave us approval based on our SketchFlow demo, we had to divide and conquer the application with only 2 weeks left to build the physical robot, the server software, and the phone software. And on top of all that, since we were consuming an unfinished product, everything had to have backup plans.
Here's a fun thing to do with an older robot that you aren't sure what to do with: turn it into a musical instrument! Using a motor to make music is nothing new, however this approach by LMR user RobotFreak is nice because you can try it without building any new hardware. This technique works because you can turn a motor on and off very quickly, causing it to act like a speaker.
We here at MAKE are thrilled to have teamed up with the fine folks at Jameco to bring you The Make: Robot Build. Over the next eight weeks, we'll be featuring a series of tutorials here on the site about the basics of robot building, from overall design considerations to mechanical construction, electronics, and programming. The information in these tutorials and the build contest are designed so that anyone can participate, even if you don't know anything about electronics or robots! On March 27, we'll officially launch The Make: Robot Build contest, and over the ensuing weeks, each week, we'll cover a different subsystem of robot construction (drive train, controllers, sensors, etc.) and help contestants in building these subsystems on their bot. Builders will post progress images to the MAKE Flickr pool and we have a topic set up in the MAKE Forums for discussing your project.
The Goal: Build a CoasterBot! The goal of this series and the contest is to teach you how to build a simple robot and for you to learn all of the various aspects of design and the mechanical and electronic systems used in robots. Contestants will build "CoasterBots," mini robot development platforms, made using CD/DVD media as the main body components ("coaster" being slang for a dead/damaged CD/DVD). Your goal is to create a CoasterBot that can navigate a space on its own, avoiding obstacles, and that is designed so that additional sensor systems (proximity, heat, light, sound, etc.) can be added "on top" of this obstacle-avoidance behavior. Contestants are free to use the CD/DVD media in any way they choose. Extra points will be given for creativity and innovation in the overall design.
We will have a two-week prep phase where we'll post overview articles here about basic robot design and construction and to allow time for readers to start planning out their design and to gather needed parts and supplies. Then, each week, we'll cover a different build phase, from design and chassis/drive train, to microcontrollers and sensors. The final two weeks will be devoted to finishing up the bots, fleshing out your documentation, and submitting your project(s). Please see the timeline and further details on The Make: Robot Build contest page. You can enter as many bots as you like, but you can only do a single entry for each one.
The Contest and Prizes
The contest will begin at 12:01am PDT on March 27, 2010 and will end at 11:59 p.m. PDT on May 7, 2010. Winners will be announced on May 14th, 2010.
Judging Criteria
The robots entered into the contest will be judged on the following criteria:
50% Overall Robot Design
20% Creative Use of Materials and Innovation of Design
20% Project Documentation
10% Degree of Improvement (from early phases of the competition)
The Prizes
The Grand Prize is $500 Cash (in the form of a pre-paid credit card) and a free ticket to Maker Faire Bay Area 2010. The $500 can be used towards travel to the Faire, as the winning robot will be featured at Maker Faire. The Grand Prize winner will also receive a Jameco jacket.
Second Prize is a Parallax Stingray Robot and a Jameco T-shirt.
Third Prize is a $100 Jameco gift certificate, along with a Jameco T-shirt.
Every contestant who finishes the robot build and documents his or her finished project will receive a Maker's Notebook from the Maker Shed.
The Robot Build Newsletter
We'll be mailing out a newsletter each week of the contest with the latest contest details, tutorials, images from contestants' designs, build tips, technical advice, and more. We'll also be sending out word of the final contest submission form through the newsletter, so if you want to be a contestant, you need to subscribe. All we need is your name and email address (which we'll keep confidential):
The Jameco Robot Build Kit Bundle
Jameco has put together a core parts bundle to make it easy to gather the necessary parts for the contest. It includes a Solarbotics Ardweeny Arduino microcontroller, a Solarbotics Breadboard Voltage Regulator, an L293D motor controller, two Hi-Tec HS-322HD servomotors, two Parallax BOE-BOT/Sumobot wheel/tire sets, two lever switches, a breadboard, battery holders, wire, hardware, all sorts of goodies for building your coasterbot. You do not have to buy this kit to participate, and it won't be counted in the judging, but we at MAKE and the folks at Jameco put it together to make getting started in this contest as easy as possible. You can purchase your Jameco bundle and other parts here.
BTW: In the Jameco parts bundle above, the "Ardweeny kit" is the Solarbotics Ardweeny Arduino, the world's smallest Arduino microcontroller, and the Solarbotics Breadboard Voltage Regulator is also included in the kit (parts no. 2115750 on that list).
Check out the Make: Robot Build contest page for more info, the build timeline, and full contest rules. Matt Mets and I will be heading up the project/contest. We think this is going to be a whole lot of fun and we hope you'll join in!
Have you ever wondered what exactly is involved in building a working, radio-controlled R2-D2 robot replica? This vid documents the two-year process of Victor Franco, of Southern California, and his friends building an R2, mainly from scratch-built parts of varying materials, including wood, styrene, resin, and aluminum. He also used some parts provided by members of the R2 Builders Club. Nice work! [Thanks to Chris James and Michelle Iva Cook Hlubinka!]
Guilherme Martins wanted a simple Arduino-compatible board that he could use as a robotics platform, so he designed one. Called the Motoruino, he took a standard Arduino board and added an H-Bridge chip so that it can control two motors directly. Of course, you could certainly get the same functionality using an add-on board such as the MotorShield (or even by making your own on a breadboard). If you know you are going to be making a robot, though, I can certainly see that having everything together on a single piece would help make your project smaller and more reliable.
He is working on some final tweaks, and plans to release the project under the Creative Commons license. Cool stuff! [via Lets Make Robots]
Liam built this impressive robot, then used it to demonstrate the difference between proportional and PID control. The robot is designed to stay a certain distance from an object, and uses two Sharp IR distance sensors to track it's position. The system looks like it is working great, however he is noticing some variability in the output of the distance sensors he is using- anyone have any ideas?
This is the GBOT with a PID controller using the ZX-40A microcontroller from http://www.zbasic.net. ZX-40A is based on the ATMEGA644 AVR chip. Inputs include 2 IR range sensors (GP2D12). Outputs include 2 PWM signals to the Pololu motor driver (VNH2SP30).
The GBOT maintains a setpoint distance of 10-inches from a target and maintains that distance, no matter what. The control system was originally coded with P-control only and resulted in excessive overshoot and oscillations. So then I added PID control. See video to observe P-control vs. PID control.
Had trouble with IR sensor noise. Issue mitigated with hardware and software. Hardware... added low ESR 1,000uF capacitors on VIN and VOUT of the LM2940T voltage regulator. Software includes an 8th order butterworth filter to clean IR sensor position and velocity. I did have issues with a fire, probably caused by a short or the motor driver. Not sure yet. Since isolating the regulator with the filters and after adding a large heatsink to the voltage regulator, no more fires. See picture below of "incident".
Anyone have experience or information on GP2D12 IR sensor distance variability? I have the noise reduced to 0.025" amplitude. Can this be reduced further? Thanks.
Odex 1, from Odetics, Inc. ; is a six-legged walking robot that weighed only 300 pounds. Its onboard computer could be operated remotely and the robot moved under its own power. It is capable of reconfiguring its shape to be tall and slender or short and squat, and able to walk in either configuration or anywhere between the two. Each leg is able to lift 400 lbs, the "legs" are versatile enough to be used as manipulators as well. Odex is capable of lifting over 2,100 lbs vertically, or carrying over 900 lbs. at normal walking speed. To display Odex 1 agility, engineers commanded the robot to walk to a truck, get on the truck, and then get off and actually move the truck.
Neil Fraser's Lava Lamp Centrifuge is 10' across, weighs 50 pounds, and spins at 42 rpm generating 3 Gs. It uses a Nexus One's accelerometer to measure g-force. Excellent!
Will lava lamps work in a high-gravity environment such as Jupiter? This topic spawned considerable lunch-time discussion and no clear consensus emerged. Most people initially assumed that the wax would sink to the bottom and wouldn't cycle, but as the physics was examined in greater depth this assumption became difficult to defend.
To find out how lava lamps behave in super-terrestrial gravity, I built a large centrifuge in my living room. This was intended to be a fun activity for a long weekend in January. However the project's size and power requirements were well outside my previous experience. Thus it was a rich learning experience as I encountered one metal-shredding and wire-melting failure after another. In the end, perseverance paid off and I obtained the answer to the original question.
The goal of this series and the contest is to teach you how to build a simple robot and for you to learn all of the various aspects of design and the mechanical and electronic systems used in robots. Contestants will build "CoasterBots," mini robot development platforms, made using CD/DVD media as the main body components ("coaster" being slang for a dead/damaged CD/DVD). Your goal is to create a CoasterBot that can navigate a space on its own, avoiding obstacles, and that is designed so that additional sensor systems (proximity, heat, light, sound, etc.) can be added "on top" of this obstacle-avoidance behavior. Contestants are free to use the CD/DVD media in any way they choose. Extra points will be given for creativity and innovation in the overall design.
