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Mechanics and Construction / Re: 3 wheel vs. 4 wheel, 2 motors vs. 3 motors,
« Last post by Schlayer on December 19, 2014, 06:48:24 AM »
Hi . I think this article will be useful for you  - .
Interestingly enough, the sumo robot I helped to build was for this same exact competition! Ours did considerably better than the one that article was written about (1st place at the PA state competition), but it does seem to provide some helpful tips on getting started with an RC sumobot and proves a very through overview of the hardware required sans micro controller to build a truly autonomous robot.
Misc / Re: Kurukshetra 2015
« Last post by jimujan on December 18, 2014, 06:55:28 AM »
That's sound interesting, I will register.
Mechanics and Construction / Re: 3 wheel vs. 4 wheel, 2 motors vs. 3 motors,
« Last post by jimujan on December 18, 2014, 06:53:14 AM »
Hi . I think this article will be useful for you  - .
Robot Videos / Re: Ball collector robot by 13 yr old boy
« Last post by jimujan on December 18, 2014, 06:51:00 AM »
I watched this vide , that's cool .
Electronics / Help with sensors for a Chess Board/Pieces
« Last post by paddymcd93 on December 18, 2014, 06:07:59 AM »
I am attempting to make a chess playing robot. This is my original idea but if it turns out to be too difficult I may instead change to checkers. My plan is to make a cartesian robot similar to a gantry crane with a grabber arm to move the pieces.

I am having difficulty in figuring out how to track the movement of each piece across the board. An idea I had was to have the robot move both player's pieces using a keyboard which I can input the co-ordinates. The pieces at the beginning of a chess game are always set up the same. So in the robot's code there are multiple arrays that store where the pieces start off and so will be able to track each piece.

But after thinking about this more I would prefer to have sensors in the board which will allow me to move my own piece and the robot to respond with its' move. Possibly put a magnet in the bottom of each piece and underneath each square have a magnetic reed switch hooked up the an Arduino.

Could anyone offer my any advice on how they would approach this problem?

PS I am quite inexperienced with robotics and programming so i'd appreciate if any responses were kept at simple as possible
Mechanics and Construction / Re: Need Help with a Rear Wheel Drive Car Style Robot
« Last post by Schlayer on December 17, 2014, 12:11:00 PM »
Thank you! This all seems quite helpful, especially the vibration dampening idea. I hadn't really considerred isolating the components to handle vibrations away from the main chassis, and that sounds promising. I will likely use Velcro for the battery which should cushion it considerably, and I got some two-sided foam tape that I can probably secure everything else in tandem with zip ties except the motor and servo.
The way I configured my steering mechanism is going to make waterproofing the servo difficult, but I might just wrap it in a balloon or other thin walled plastic layer. I know DC motors themselves are pretty electrically sound when wet, but if I find a way to manufacture a curved plastic shield I might look into that.

Now the rain protection issue (ingress protection):
The plastic enclosure on your receiver or even a piece of plexiglass over the electronics will offer some level of protection but if you truly want to operate in the rain i would go a step further. The integrity of any enclosure you build depends on your design and how well it is constructed (so its hard to give you an assessment on its effectiveness). Buying an enclosure might be a simpler option but be aware any modifications you make may impact the integrity of the enclosure. A little reading on Ingress Protection or NEMA ratings might give you some ideas on what level of protection is appropriate for your application.

I looked up some arduino enclosures and they are pretty cheap so I will probably get one of those.  As for the other parts, I doubt I will be able to find part-specific enclosures, so plexi will probably be fine. I couldn't find NEMA ratings on small electrical enclosures, it seems those mostly matter for industrial applications, but I have seen more general claims such as 'weatherproof' and 'waterproof' and the like on several models.
I bought some single pin breadboard jumpers for the testing phase when I finally buy the Arduino model I think will work best, but I bet I should solder connections that aren't directly to the arduino headers before I take it for a spin. I'll probably use heat shrink to insulate any soldered connections as another water precaution, and if I figure out a really rock-solid configuration for the arduino headers I might be able to seal off the slits the enclosure comes with on top using hot glue so it is totally watertight. I definitely wouldn't need to make any more cuts in the enclosure, so it shouldn't compromise anything except my ability to move around the jumpers.
Mechanics and Construction / [advertisement] NEW ServoCity Gearmotors with Encoders
« Last post by ServoCity on December 17, 2014, 09:58:21 AM »
We're excited to announce the release of our new Actobotics gearmotors with encoders. Offered in 11 different speeds ranging from 27 RPM to 2,727 RPM, you're sure to find the perfect motor for your next project! $49.99

These 3-12V Precision Planetary Gearmotors are equipped with dual ball bearings, full metal gears and 3 PPR Magnetic Encoder.

Compatible accessories include: Hub Sprockets, 4mm Clamping Hubs, 4mm Set Screw Hubs, Disk Wheels and 4mm Pinion Gears.
Misc / RoCKIn Camp 2015 - Call For Applications
« Last post by RoCKIn Robot Challenge on December 17, 2014, 08:25:57 AM »
Date: March 18-22, 2015
Location: Peccioli (Pisa), Italy,

RoCKIn is short for "Robot Competitions Kick Innovation in Cognitive Systems and Robotics" ( and it is an EU-funded Coordination Action aimed at the promotion of research and education through competitions.

The RoCKIn Camp 2015 aims at leveraging the preparation of teams to participate in the RoCKIn@Home and RoCKIn@Work challenges, the competition event that will be organized by RoCKIn in Lisbon 2015. RoCKIn@Home and RoCKIn@Work take inspiration from the corresponding RoboCup leagues, but they focus on benchmarking robotic systems and networked robots. Both challenges require basic navigation capabilities with no restrictions on the mobile platform, advance perception, manipulation and human-robot interaction. RoCKIn@Home focuses on tasks that service robots execute in a real home environment, while the tasks to be performed in RoCKIn@Work target an industrial automation scenario.

The RoCKIn Camp 2015 will take place from 18th to 22nd March in the ECHORD++ facility of Peccioli (Italy) and it is designed as a hands-on week long school, where teams improve the performance of their systems through working sessions in the RoCKIn competition tasks and functional benchmarks. At the Camp site, a realistic environment for both competitions will be provided by relying on the existing ECHORD++ testbeds and equipped with the RoCKIn groud truth system for logging data and create benchmarks. The activities planned correspond to the Tasks and Functional Benchmarks as defined in RoCKIn (

As outcomes of the field exercise, we plan to collect the best technical and scientific contributions achieved through the experimental evaluation performed at the Camp in the task and benchmarks into a Special Issue of a scientific Journal.
In addition to the teams selected after the RoCKIn 2014 competition event, the RoCKIn Camp 2015 is open to additional participation of European teams. We accept applications in two formats:
   Team applications (for teams with an already established record). Team applicants must bring their robot to be used in the practical activities.
   Individual applications by team members.

All successful applicants (individuals and team members) will be offered:
   Accommodation in shared rooms (including breakfast, 5 nights)
   Lunch (5 days) and social event
   Access to the testing facilities arranged for the RoCKIN@Home and RoCKIn@Work

Each selected team will be allowed up to four team members and will be awarded a travel support up to 1200 Euros.
Applications should be submitted via The applications should include a technical report including team description (including previous experience, role and competence of team members) and a detailed technical presentation of the proposed solution for the task or functional benchmark to be addressed during the camp.

Applications may address one or more tasks or functional benchmarks. The selection will be based on the team submission material and, in particular, on the quality and maturity of the technical solutions proposed for the RoCKIn task and functional benchmarks.

Important dates:
   Application deadline: January, 20th 2015
   Notification of acceptance: January, 31st 2015

For further questions contact Daniele Nardi: [email protected]
you want to search for "catalytic converters"
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