Recent Posts

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21
Misc / Re: hobbyist for hire?
« Last post by mklrobo on February 25, 2015, 07:05:34 AM »
 :) Hello!
I agree with your assumption that you will need a lower torque servo.
At this point, you have a ballpark idea of what you want to do, just the
"tweeking out"  is needed. It seems that the critical part of the robot finger
is going to be the screen touch sense, in which you will probably want to
have two; one for the screen, and one for an overpush limit.
Keep me posted....  ;D ;D ;D
22
Misc / Re: hobbyist for hire?
« Last post by dmehling on February 24, 2015, 04:39:21 PM »
I just got to wondering if servos are the right type of actuators for this project.  I am concerned about the amount of torque they can generate and if they could potentially damage or scratch the surface of my Kindle touch-screen.  At the same time, a low torque actuator would probably require much less power, which would also be quite helpful.  However, I really have no idea what else I could use.  I just need a way to gently touch the screen.
23
Software / Re: Controlling robot using its graphical 3D model
« Last post by Embrio on February 24, 2015, 02:45:30 PM »
Not sure if you are still interested in this older topic, but I did this once a few years ago using Blender, which is an open source 3d modeling and animation tool.  Here's the simple arm I made: https://www.youtube.com/watch?v=zIgNB6w307I.  It was a while ago so i don't remember the specifics exactly, but I made a script (I think in Python) that ran in Blender which recorded the rotation positions of the animated model then sent those to another process that transformed those values to the range needed by the servos, then sent them via serial cable.  I don't know if I still have the code, but that was the gist of it, I don't think it was too difficult.  Good luck!
24
Mechanics and Construction / Re: Building an Electric Car - How to optimize?
« Last post by mklrobo on February 24, 2015, 11:31:15 AM »
 8) Cool! I am on your side!  8)
The motor, in this case, will be your advantage. Balancing the
batteries, as a load, could be used to your advantage. A
lighter 9 volt battery, or equivalent? Find the lightest material you can to make
your electric car, as that can be translated to pulling power.
For your gear ratio;
What is the projected wieght of the car?
What is the diameter of the wheels?

Keep me posted....   ;D ;D
25
Mechanics and Construction / Building an Electric Car - How to optimize?
« Last post by Schlayer on February 24, 2015, 09:26:27 AM »
I have a little project to do for a segment of a competition between high schools. For this event, we need to make an electric car using a specific motor and it may only be powered by 1 or 2 standard 9-volt batteries. The car is scored based on how quickly it can drag a sled (a cut open cardboard box) carrying various provided masses (up to a total of 5kg) a distance of 5 meters. The scoring uses the following equation:

distance * (masses + mass on sled) / travel time

Basically, I need a way to find out the optimal gear ratio to use with this motor : http://www.pitsco.com/Motor_385
Any help would be appreciated!
26
Robot Videos / Re: Snap together Smartphone controlled robots
« Last post by mklrobo on February 23, 2015, 06:12:38 PM »
 8) Cute and Cool!   8)
27
Robot Videos / Snap together Smartphone controlled robots
« Last post by GroBotz on February 23, 2015, 03:04:02 PM »
this is a video of GroBie, an app controlled car made from GroBotz modular robotics kits. 



We also have a KickStarter campaign going if anyone is interested.

https://www.kickstarter.com/projects/768976803/grobotz-snap-together-modular-robots-that-grow-wit
28
 :) Hello!
I saw your title, with no code, and so I was confused. I saw in your explanation that
you use visual programming enviroment, which is more intuitive. Good Job!
 ;D ;D ;D
29
Robot Videos / Autonomous obstacle avoiding car with no code! Using Arduino and Embrio
« Last post by Embrio on February 23, 2015, 09:39:39 AM »
Embrio is a new visual programming environment that I've been working on for some time, currently for use with the Arduino on Windows, but more platforms will be coming soon.  I put together an example project showing how to use it to program an autonomous wall avoiding robot, which I think is pretty cool and really shows off its strengths.  The 3 videos and more information can be found at http://embrio.io/projects/project.aspx?id=5
30
Software / Re: How to rotate a servo continously?
« Last post by Inigo Montoya on February 21, 2015, 10:43:59 PM »
Hello, nice to see someone run into the same problem I had, it means I can help.  My entry into the world of servos and micro controllers was similar.

Servos, straight from the store, work in roughly a 180 degree sweep, and the signal from the micro controller controls the POSITION.

Many servos can be modified for "continuous rotation" but there is a sacrifice.  Position becomes unknown, the signal instead controls SPEED and DIRECTION of rotation.  To have all of the above is a very expensive device.  The best way to see if your specific servo can be modified (this is usually permanent), you will have to consult Google.
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