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What kind of engineering works need one company that develop very accuracy arm robots except develop engineer in mechanics or develop engineer in control and what these engineers do in these job?
What are the knowledge, experiences, requirement that are desirable to have for purchasing engineering in a company that develop very accuracy arm robots?
Mechanics and Construction / Re: Modifying servos
« Last post by DiegoChavez on November 23, 2014, 10:10:48 AM »
It wasn't hard, just try fail repeat. If you seriously got stuck in something Google it. You can also read some books of the internet on how to learn the program that you want to learn. And yes a raspberry pie is a good option, I haven't had the time (or money) to get my hands on one but I have seen some pretty sick things that people do with it. I would recomend to see YouTube how-to videos, and go to www.instructables.com and search for projects.
Software / Re: 50 dollar robot code building error
« Last post by Gertlex on November 23, 2014, 09:22:32 AM »
I'm not sure what's up with that (though it doesn't seem that that issue would arise due to using a different version of AVR Studio).

Just in case it might help others, what version of Windows are you running? And what Atmega chip are you using for your $50 robot?

There are some google results for you error. Is it possibly you have AtmelStudio set up to compile for the wrong chip?

Finally, I would suggest trying AVR Studio 4 if the above doesn't work, as that is known to work best in the past; You might avoid some future issues, but again, unlikely to be the issue here.
Electronics / Re: 50 dollar robot question
« Last post by Zevoo on November 23, 2014, 09:07:02 AM »
the micrcontroller was not pressed to the socket enough so it didnt connect to some of the pins...  I was scared that I'd wreck the microcontroller if I pressed it too hard.

Okay I shall try it.
Electronics / Re: 50 dollar robot question
« Last post by jkerns on November 23, 2014, 07:09:53 AM »
1) What did you do to get it working? What you learned could help someone else with the same problem.

2) It appears that there have been some updates http://www.nongnu.org/avr-libc/user-manual/group__avr__interrupts.html

try ADC_vect  in place of SIG_ADC
Misc / Re: What is the best system to work with Axon
« Last post by Gertlex on November 23, 2014, 02:01:22 AM »
In general Windows 7 is a good bet. But if you run into trouble, PM Webbot on these forums. He's very good at replying and helping.

I've found windows 7 64-bit and webbot studio to work well. However have not been able to workaround compile errors with webbot studio and windows 8.

I've had this issue too, on two or three 64bit systems.

I've managed to work around the issues on Win 8 (And Win 10 preview, just today), and am going to message Webbot about this in the next few days. Quick answer is the following steps:

0) If webbotlibstudio is giving you errors during setup when it's building the files, just keep closing the errors, there's going to be one for each processor....

1a)  In the WebbotLibStudio install directory, there is its own copy of WinAVR-20100110. It has a subfolder utils/bin, which contains a few versions of the msys-1.0.dll file. Rename the one with that name to e.g. msys-1.0.dll.orig, and then rename msys-1.0.dll.64 to msys-1.0.dll. This file that you want has a Date Modified of 5/18/2007.

1b) (only if you installed WinAVR separately from WebbotlibStudio) In the install directory for WinAVR-20100110, again in utils/bin, you want the msys-1.0.dll that has the 2007 timestamp. This probably doesn't exist, so rename the existing one, and copy the one with the 2007 timestamp from WebbotLibStudio's copy of WinAVR to this location as well. (Also, WinAVR-20100110/bin needs to be in your PATH variable, but I'm assuming that was taken care of already...)

2) Since webbotlibstudio presumably failed to build the avr libraries (aka step 0 above), we can build them ourselves. If you navigate to C:\*WebbotInstallFolder*\WebbotLib\AVR8 in command prompt (where the last part of *WebbotInstallFolder* is probably WebbotStudio-1-03b), and then run `make clean` and then `make all`, you will repeat what failed in step 0.

Note: Step 1b needs to be done if you ever build AVR code outside of webbotlib studio.  On Windows 8, step 1a allowed step 2 to work.  On my Windows 10 setup, I had to do 1b to get step 2 to work. This is probably because I have the PATH variable set differently on the two computers; I haven't had a chance to double check that this is indeed the case, though.
Software / Re: Super fast obstacle maze solving. How?
« Last post by bdeuell on November 23, 2014, 12:26:23 AM »
question double posted (http://www.societyofrobots.com/robotforum/index.php?topic=17921.0)

my reply copied below:

     googled "Min7 micromouse"

     see the creators site

Misc / Re: Super fast obstacle maze solving. How?
« Last post by bdeuell on November 23, 2014, 12:22:41 AM »
Mechanics and Construction / Re: how to make tiny pistons move
« Last post by bdeuell on November 23, 2014, 12:04:41 AM »
method 1

 - I calculated 30.8 psi for a cylinder that can produce 6N from a 6mm piston, air pressure = cylinder force / piston area
 - not sure how you calculated the 300 newton solenoid for the diaphragm as i couldn't find the cylinder stroke requirements or diaphragm/bellow area
 - a 4mm tube seems very big for a 6mm bore cylinder, but it would not affect your pressure/force calculations significantly, it will mainly affect speed.
 - i think the biggest negative of this method is that over time air will leak out of the system and the stroke of your cylinder may decay.

method 2

 - same pressure calculation as method 1, 30.8 psi
 - this would be my recommended method to implement a air cylinder actuator
 - to decrease the reservoir requirements you may be able to use a pump to constantly recharge the reservoir pressure
 - i would try and find off the shelf products but not sure exactly what is yout there for low cost (or what other size/weight restrictions you may have)
 - there are lots of solenoid valves available for industrial automation

Method 3

 - this is probably the simplest system design but the solenoid actuators may or may not be possible/practical
 - all the points made by SeekingVision are valid in solenoid design
 - to assess whether a solenoid will be possible in your space requirements you can look at the specs of commercial solutions and see what the force for a given size is
 - you could also use a magnetic core to increase the force

Mechanics and Construction / Re: Linear Actuator with feedback
« Last post by SeekingVision on November 22, 2014, 09:49:32 AM »
Sorry for my undetailed reply but ill probably be better off drawing the circuit I'm talking about. I did a quick web search and found nothing immediately so I guess what I'm referring to isn't regularly done. I'll post a picture soon.
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