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41
Electronics / Re: 2 -12V DC motors vs 1-24V DC motor
« Last post by bdeuell on December 09, 2014, 06:19:39 AM »
Can you explain what you are trying to achieve and how you plan to use two motors in place of one?

Generally speaking you can achieve a higher power density with higher voltage motors. This is usually a very good thing in robotics.
42
Electronics / 2 -12V DC motors vs 1-24V DC motor
« Last post by Ninjasquee on December 08, 2014, 09:54:46 PM »
I am building a robot, and I was wondering if there would be an advantage to using two 12V DC motors vs one 24V DC motors, assuming that I can achieve the same rated torque output in both setups. Is there an advantage(or disadvantage) to having a lower voltage system?
43
Electronics / Re: Starter Kit
« Last post by bdeuell on December 08, 2014, 05:48:07 PM »
BenBilly - the link you found is to a version which includes an Arduino controller the link Schlayer provided is to a basic stamp version. Here is a comparison of th various Boe-Bot versions http://www.parallax.com/sites/default/files/downloads/Parallax-Small-Robot-Comparison-Chart-v1.1.pdf. Also note that Parallax is the company that produces this robot.

Please note - I don't have anything against the other robot kits out there and am sure many of them are great, but I don't have experience with them.
44
Software / ATMega RAM management
« Last post by mstacho on December 08, 2014, 03:50:25 PM »
Hi all,

this is a weird question, so please read the asterisk* at the end of the post before telling me it's not necessary to do this way :-)

If I write code like this (in Arduino, to make life easy):

int x = analogRead(A0);

then a new variable, x, is created.  x is of type int, and stores whatever value is read by the ADC on channel 0 somewhere in RAM.  My question is: what is it that allocates that memory?  I know that you can directly access and modify RAM just by using pointers, but what is the mechanism on the chip that does it?

I ask because I want to write my own little OS, and I feel like it will be fun to make my own memory manager so that people can script on it (like MATLAB, I want people to write their own little programs in a small environment, then have it run by allocating memory and following a program counter etc).  I know that this is painful, but I just want to know how these things are done, not to necessarily make a practical OS.  Any thoughts?

*Yes, I know, there is rarely a practical reason to do this.  I am more interested in writing this MMU because I want to see how hard it is and what things I need to consider, not because I think I can do better than the chip does it.
45
Electronics / Re: Starter Kit
« Last post by BenBilly on December 08, 2014, 01:57:18 PM »
Ok so I have been looking into this boe-bot system and found this http://www.parallax.com/product/32335 would you say its the same as the kit you linked above, if not what is it lacking over the one above?

Thanks,

Ben
46
Misc / HGR Industrial Surplus - Used Industrial Robots/Parts
« Last post by PTD on December 08, 2014, 10:59:39 AM »
We currently have in stock 72 robotic items, from full industrial robots to parts, controllers, etc. that members of the forum may find useful.  You may follow this link for additional information: http://bit.ly/1vwtJwv
47
Electronics / very accuracy motors
« Last post by Ana_Dig on December 08, 2014, 08:03:44 AM »
I am searching in google after professors websites or articles \ papers or video lectures in very accuracy motors (1 nano meter), that use the principals of piezoelectric and ceramic motor movement, that can move in linear and rotate movement and they are rapid, and very small, if you know about good websites in this area so I will glad to know about that
48
Electronics / Re: Starter Kit
« Last post by bdeuell on December 07, 2014, 11:22:33 PM »
I can personally recommend the Boe-bot. Depending on your programming and electrical experience the you may be able to breeze right through the tutorials but for a beginner they are a great guide and teach a lot of the basics. This is how i got started in robotics!

If you have some experience it is still a great little platform and is easy to add sensors or other mechanical bits, with an onboard breadboard and slotted aluminum chassis. I recently revived my (10 year old) boe-bot outfitting it with a new arduino. I had the little robot following my foot or wandering the apartment in no time. At one point I was working on turning the boe-bot into a vacuum, never completed the project but did get a good part of the mechanics and some of the electronics built.

Also note, the robot is available in several versions including arduino or basic stamp controller.

49
Electronics / Re: Starter Kit
« Last post by Schlayer on December 07, 2014, 09:32:51 PM »
So does this kit have the ability to have more sensors added at a later date?:

http://www.radioshack.com/make-it-robotics-starter-kit/2770168.html?utm_source=GooglePLA&utm_medium=pla&utm_term=2770168&cid=iP:PLA:RSO:Google#.VILigzGsVWh&tab=tab3


Yes. Since it runs off an Arduino Uno, and Arduino shields or sensors Adafruit (maker of the Arduino) sells that are compatible with the Uno should be compatible with this bot. :)


I have been also looking at this bot which is more about programming because its already built is there another kit like this but cheaper?


A quick google search led me to the Boe-Bot kit <http://www.amazon.com/Parallax-28832-Programmable-Boe-Bot-Robot-Kit/dp/B0007ZQ2CS/ref=sr_1_1?ie=UTF8&qid=1418009338&sr=8-1&keywords=boe-bot+robot+kit#customerReviews> Which seems like it would suit your needs.
"The Boe-Bot robot takes about 1-2 hours to put together, though each project in the Robotics text provides a unique new experience of wiring and source code tuning. No programming or electronics experience is needed!
Completing the entire set of projects takes 50 hours and is suitable for anybody over 12 years of age."

Best of luck!

50
Software / Re: MD25 Motor Driver encoder read problem
« Last post by Webbot on December 06, 2014, 08:16:32 AM »
Both those algorithms look ok and are effectively doing the same thing. The first one shifts they byte to the right place before adding to the result. The second adds each byte into the result and repeatedly shifts the result - ie the first byte will get shifted 3 times and 3 x 8 = 24.

You dont say what libraries you are using eg WebbotLib, WebbotLibStudio, Arduino, Atmel AVR Studio 6, WinAVR. or something else.
The reason for asking is that you may actually be building up the 'long' ok - but falling down in the way that you are trying to print it as a number over the USB port. So would be interesting to know how you are doing that.
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