SERVO MAGAZINE CNC for ROBOTEERS • SOUND for the ARDUINOBOT • VENUS FLY TRAP • SENSOR OLYMPICS March 2012 Full Page Full Page.Qxd 1/30/2012 4:10 PM Page 2
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03 4 $7.00 CANADA $5.50 71486 02422 $5.50US $7.00CAN 0 U.S. CoverNews_Layout 1 1/31/2012 5:53 PM Page 1 Vol. 10 No. 3 SERVO MAGAZINE CNC FOR ROBOTEERS • SOUND FOR THE ARDUINOBOT • VENUS FLY TRAP • SENSOR OLYMPICS March 2012 Full Page_Full Page.qxd 1/30/2012 4:10 PM Page 2 Remember the good old days when you were able to speak to a live person and ask them a question? You still can at Hitec, where we provide the best of both worlds: Old fashioned customer service with modern technology! Our legendary service department provides expert advice and quick, dedicated solutions to all your robitic inquiries. From recommending the perfect servo for your vehicle to providing instruction about our line of battery chargers, the dependable and caring Hitec sta is here for you. Hitec Customer Service Monday thru Friday 8:00am – 4:30pm Pacic Standard Time Expect More! Expect Hitec! TOC Mar12.qxd 1/30/2012 3:13 PM Page 4 03.2012 VOL. 10 NO. 3 PAGE 70 PAGE 10 Columns 08 Robytes by Jeff Eckert PAGE 76 Stimulating Robot Tidbits 10 GeerHead by David Geer Robotic Venus Flytrap Models Small Muscle Function; Catches Bugs 06 Mind/Iron PAGE 24 To Use As Fuel 20 Events 14 Ask Mr. Roboto Calendar by Dennis Clark 21 Showcase Your Problems Solved Here 22 New Products 70 Twin Tweaks 24 Bots in Brief by Bryce and Evan Woolley 67 SERVO The Sensor Olympics Webstore 76 Then and Now 81 Robo-Links by Tom Carroll Departments 81 Advertiser’s What Can Your Robot Do? Index SERVO Magazine (ISSN 1546-0592/CDN Pub Agree#40702530) is published monthly for $24.95 per year by T & L Publications,Inc., 430 Princeland Court, Corona, CA 92879. PERIODICALS POSTAGE PAID AT CORONA, CA AND AT ADDITIONAL ENTRY MAILING OFFICES. POSTMASTER: Send address changes to SERVO Magazine, P.O. Box 15277, North Hollywood, CA 91615 or Station A, P.O. Box 54,Windsor ON N9A 6J5; [email protected] 4 SERVO 03.2012 TOC Mar12.qxd 1/30/2012 3:14 PM Page 5 In This Issue ... 44 Sounding Off by Gordon McComb Learn how to give your Arduino bot completely electronic sound effects, music, and even voice. 54 Product Review My Time With the TurtleBot by Alan Federman 58 CNC From a Robot Builder’s Perspective PAGE 44 by Michael Simpson Once you discover Computer Numerical Control and its ability to accurately and consistently create parts for even your most complicated robot design, there will be no going back ... The Combat Zone... Features 30 BUILD REPORT: 38 PARTS IS PARTS: Shaka v.3 — Part 1: Making Wheels Round Design Goals and Methodology 39 The History of Robot Combat: 35 BUILD REPORT: Life After BattleBots Antweight — Motor City Massacre Events 36 BUILD REPORT: 41 Upcoming and Completed Nyx, Sportsman, and Dragon*Con Events 30 lb Bot — Part 1 SERVO 03.2012 5 Mind-Iron - Mar 12.qxd 1/30/2012 3:30 PM Page 6 FOR THE ROBOT Mind / Iron INNOVATOR ERVO Published Monthly By by Bryan Bergeron, Editor T & L Publications, Inc. 430 Princeland Ct., Corona, CA 92879-1300 (951) 371-8497 What’s The Point? However, avoiding platform FAX (951) 371-3052 development is probably shortsighted. Webstore Only 1-800-783-4624 I just purchased a pair of those There’s a lot to be learned from www.servomagazine.com R/C mini-helicopters for about $20 building your own robotics platform. Subscriptions each. Consider that even if I could Even if your creation is heavier, Toll Free 1-877-525-2539 design such a craft, the parts for a bulkier, more expensive, and less Outside US 1-818-487-4545 remote control, battery recharging maneuverable than what’s P.O. Box 15277, N. Hollywood, CA 91615 circuit, and radio receiver would cost commercially available, there is the PUBLISHER more than $20. The helicopter body, fringe benefit of learning how to Larry Lemieux servo motors, gyroscope, and gears engineer a platform on your own. [email protected] would probably cost another $200, That might translate to frequent ASSOCIATE PUBLISHER/ assuming I could find the parts and crashes, delays, and some degree of VP OF SALES/MARKETING the plans to build the helicopter. frustration. However, in the long term, Robin Lemieux [email protected] This reality is both cause for you’ll know not only how to flip a celebration and potential depression. power switch, but how to repair, EDITOR Bryan Bergeron On one hand, robotics has never been upgrade, and modify your creation. [email protected] as affordable for the roboticist. If I’m not suggesting you ignore all CONTRIBUTING EDITORS you’re looking for raw materials for of the great bargains out there. Jeff Eckert Jenn Eckert your project, it’s simple enough to buy Instead, leverage what you can get Tom Carroll David Geer a fully functional device and strip it for your hands on by performing non- Dennis Clark R. Steven Rainwater parts. Stripping one of those destructive teardowns. Working Kevin Berry Gordon McComb Alan Federman Michael Simpson helicopters yielded dozens of small incrementally, disassemble and then Thomas Kenney Mike Jeffries parts that I couldn’t have located — reassemble the device. For example, if Morgan Berry Bryce Woolley much less made on my own. (Perhaps you have one of those mini- Evan Woolley I could have made a few of the parts helicopters, start with the rear rotor. CIRCULATION DIRECTOR if I had one of those 3D printers.) How is it wired? How large and how Tracy Kerley On the other hand, what’s the powerful is the motor? Are the blades [email protected] point of scuttling a perfectly good R/C fitted directly on the motor or through MARKETING COORDINATOR craft? After all, why not just use the gears? WEBSTORE craft as a platform and try to attach a Next, examine the power supply. Brian Kirkpatrick [email protected] micro-camera? That’s a reasonable Use your DMM and a power resistor approach, and one that would allow to determine the voltage and milli- WEB CONTENT Michael Kaudze you to focus on, say image amp-hour rating of the Lithium [email protected] recognition, as opposed to getting a battery. How is the voltage regulated ADMINISTRATIVE ASSISTANT micro-camera up in the air. during flight? Is there anything Debbie Stauffacher onboard to protect the battery against overcharging? What can you learn PRODUCTION/GRAPHICS Shannon Christensen from the charging station? What safety circuitry or physical barriers are Copyright 2012 by T & L Publications, Inc. in place to prevent overcharging or All Rights Reserved reversing the polarity of the charge? Dear SERVO: All advertising is subject to publisher’s approval. In short, what are the takeaway We are not responsible for mistakes, misprints, I'm writing to you because I lessons that you can apply to your or typographical errors. SERVO Magazine assumes wasn't the only author of the own designs? no responsibility for the availability or condition of Pathfinder Rover article that was in Everyone loves a bargain. There is advertised items or for the honesty of the advertiser. The publisher makes no claims for the the February ’12 issue. It was also no rule that says you can’t enjoy a legality of any item advertised in SERVO.This is the written by my project colleague Rosia few toys while you’re experimenting sole responsibility of the advertiser.Advertisers and Nicolae and by our teacher (project with robotics. If you want to get a their agencies agree to indemnify and protect the advisor) Molder Cristian. Rosia and I real feel for what it takes to create a publisher from any and all claims, action, or expense arising from advertising placed in SERVO. Please are students at the Military Technical robot however, you have to take out send all editorial correspondence, UPS, overnight Academy from Bucharest, Romania. your tools, bag of parts, schematics, mail, and artwork to: 430 Princeland Court, Thank you! and get to work. After all, robotics is Corona, CA 92879. Chifor Bogdan about the journey. SV Printed in the USA on SFI & FSC stock. 6 SERVO 03.2012 Full Page_Full Page.qxd 1/2/2012 5:47 PM Page 07 Robytes - Mar 12.qxd 1/30/2012 8:08 AM Page 8 Robytes Discuss this article in the SERVO Magazine forums by Jeff and Jenn Eckert at http://forum.servomagazine.com. Botprints in the Sand You probably have never seen bipedal robots strolling down Waikiki Beach or hiking across the Sahara desert, and for good reason. Humans can trudge through sand pretty well, even after a few piña coladas, but bots aren't good at walking on a medium that shifts, slips, and allows them to sink in. Apparently, doing so tends to discombobulate their balance systems when data from the accelerometers indicate an unsteadiness in the feet. Until recently, most studies of robotic gaits have assumed stiff ground underneath, so there has been no basis for designing droids that can walk over mutable surfaces. However, at last year's International Conference on Flow Dynamics held in Sendai, Japan, researchers from Tohoku University's (www.tohoku.ac.jp) Test setup showing slippage and sinkage Graduate School of Engineering presented a paper providing an analysis of when a robot walks on sand. "slip-sinkage characteristics of sand as a fundamental research for realization of biped walking of a humanoid robot on sand." The next phase will be to come up with control software to deal with different types of sand or loose soil.