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Mechanics and Construction / Max Weight Classes
« Last post by jcsymmes on June 23, 2016, 08:20:32 AM »
Working on a quick protoype of  a design idea.

Looking for an existing  prefably cheep robotic wheeled platorom that can move ideally 30 pounds on a flat surface. I could work to lower the payload a bit but ideally not. Any ideas of what would work well.

Was thinking of hacking a Hoverboard, but wondering if that maybe to complex from what i have seen online. If there is any of its competitors out there that can be easily arduinoed that would be useful .
Mechanics and Construction / not able to make my robot turn at times
« Last post by riki on June 21, 2016, 02:08:57 PM »
I have made a basic robot using 4 dc motors and three way switches. It performed fully when i tested at home. But at the time of the robowar it jst refused to turn. From then onwards it turns only at rare occassions. I cant figure out the problem. Please help
Software / Microcontroller Help
« Last post by pina_coleata on June 21, 2016, 09:57:42 AM »
A team and I are creating a robot. The robot will have two wheels, and use differential drive. I am looking to program the micro-controller myself. I understand how to program, but I don't know what micro-controller to use. Should I use an Arduino, an AMD, or something entirely different? This robot will be RC controlled.

Thank you in advance,
Mechanics and Construction / Base for Robot Arm
« Last post by nickwalt on June 20, 2016, 12:10:07 PM »
I'm making a robot arm (my first one) and I'm trying to figure how to actuate the base. The arm will have a rotatable base with a 20cm tall tower on it, but I'm worried if I simply attach the servo to the tower then the moment from the outstretched arm will be too much stress on it. What's a good solution for this? Do I just have two discs touching each other so they hold the force and have the servo actuate the upper one? Or will that cause too much friction?

Any resources or help would be great!
Electronics / Re: DTMF 8870 Circuit Explanation
« Last post by Victor on June 15, 2016, 01:50:00 AM »
Hi,And thanks for posting back what worked, insanity schedule pdf it'll presumably facilitate others having similar problems.
Electronics / Motherboard and a high end gpu on robot
« Last post by munim on June 14, 2016, 11:25:33 PM »
Is there possible a way to get power from 12v batteries to power gpus like Nvidia Quadro or other high end gpus for image processing?
Misc / Re: Rokenbok Toys Come to Life with Arduino Programming
« Last post by Rokenbok Education on June 06, 2016, 02:41:53 PM »
Here's how to build and program the Beetle Bot, one of the many robots you can make with the new Rokenbok programmable robotics set:

Again, here's the link to the Kickstarter campaign:
Misc / Rokenbok Toys Come to Life with Arduino Programming
« Last post by Rokenbok Education on June 01, 2016, 03:51:43 PM »
Hi all,

I thought you'd dig the news that Rokenbok is jumping into robots.  Check out our Kickstarter here:

We launched yesterday and have already raised over $13,000.  The set comes with step-by-step instructions to build and program a beetle bot, a scorpion hunter and an auto-ferris wheel.  But with over 400 building components, including sensors, motor modules, hinges, wheels and gears - and a brand new Arduino-based smart block - imagination is the only limit to what you and your kids can build.

After building your Rokenbok robot, you plug the brand new ROKduino smart block into a computer and start coding.  With our easy-to-follow instructions and drag-and-drop programming, kids as young as eight years old can enjoy the satisfaction of bringing their robots to life.  After mastering the basics, itís a snap to step into full Arduino programming.  We will supply code blocks that can be downloaded from our site.  And of course, you are free to use code from anywhere in the Arduino community.

The microcontroller in the ROKduino smart block is an ATmega32U4, which is the same chip used in the Arduino Leonardo.  Everything included in the robotics set, including the ROKduino, can snap into every building component Rokenbok has ever produced.  Plus, we will be providing downloadable CAD files for 3D printers, so you will be able to create your own custom components.

The Rokenbok Programmable Robotics Set will retail for $300, but if you act now, you can get it for the early bird special of $199.

The robotic technology is advancing at a rapid pace. Though there is rapid adoption of robots in the industry, but on the consumer side we have still not seen any major product(other than quadcopters and iRobot ) which has penetrated the mass consumer market. I wonder if this is because of the fact that most robotic companies are trying to make robots and then come up with a problem which that robot can solve. Thus they are not solving any actual real world problem.

I have been studying about telepresence robots for a while and have even built an expressive telepresence robot(
).  I have started coming across people who are asking to rent telepresence robot or companies which are renting telepresence robot at events. Recently, through google ads I came across this service called Splinch ( ), which claims to deliver robots at any event in US. From the page it looks like they are still in a very early stage.

The advantages of such a service are very clear. Anyone who has money problems, cannot attend an event because he/she does not have time, people who have some kind of disability which restricts their mobility and hence make travel a pain, or someone who has everything - a paid trip, time but cannot attend some event because of visa issue will be benefited by such a service. From all the blogs and research papers I have read people find the experience of remote presence very helpful and immersive, as if they were actually present there. But at the same time, the telepresence robots available in the market are not advanced, and have connectivity issues, or need someone to take care of them in case of network discussion or when the robot falls or gets stuck somewhere.

What are your opinion on the rise of these telepresence robot rental service? Are we witnessing a use case from where robots can start becoming a part of our day to day  life? Will such a service really solve a real world problem? Or is this a area which like the currently available social robots is trying to come up with a problem which fits it's technological capabilities? And any other comment or opinion, that can increase understanding of this will be greatly appreciated.


Electronics / Building an RF Transmitter and Receiver
« Last post by stevesy on May 29, 2016, 10:50:57 AM »
Hi, I'm new to this forum.

I'm trying to build a RF Transmitter and Receiver circuit for an omni-wheeled bot that looks and moves like one
Using continuous rotational servos. 

I'm finding the RC theory a little difficult and am hoping you guys can help me to understand it better so I can get a schematic together.

I need the servos/omni-wheels to be able to go forwards, backwards and stop in the way that the joysticks and knobs on the commerical transmitters would allow for. I'm thinking a momentary on-off-on toggle switch would allow me to do this?
I know I can use pretty much any frequency for the TX RX module as I'll be operating the robot by myself away from other RCs, so interference won't be an issue.

Knowing all the components needed e.g. diodes, transistors, capacitors etc. and putting them all together into a circuit diagram I'm not so sure about.  Should I end up with something similar to this:

Grateful for any help you can give, thanks.
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