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TrevorBrummel
07-30-2009, 05:31 PM
I'm a total newbie when it comes to I/O boards and programming them. The only time I have programmed anything was when I messed around with my VEX micro-controller's programming. I want to know what a good I/O board to get would be. What I would like to be able to do is have a wi-fi connectible board with a high number of servo ports (18+) that I could program to take input from a computer interface over the wi-fi connection. I'm not real worried about cost, but weight and size are both considerations. If there isn't any one board that can do this, would someone be willing to show me a setup of multiple parts that would accomplish the same thing? ANY suggestions or pushes in the right direction would be appreciated.:D

lnxfergy
07-30-2009, 05:44 PM
Why wifi? Wifi is pretty heavywieght to send a few servo positions over.... I'd think something along the lines of SSC-32 + XBEE would be a route to investigate.

-Fergs

TrevorBrummel
07-30-2009, 05:46 PM
The option to add a camera. (Although, this may become moot because I think I'm going to buy Tyberius' camera and wi-fi encoder in the garage thread)

For now, just forget the wi-fi part, but I still want to use a computer as my interface.

darkback2
07-30-2009, 06:22 PM
Ok...I think your saying your interested in mech warfare.

Your looking for a way to teleoperate a robot, as in you are over here, and the robot is over there...and you can control it, with no wires between the two of you.

the xbee (http://www.trossenrobotics.com/p/Xbee-Communication-Starter-Kit.aspx) mentioned by Fergy is a wireless serial cable solution. So you send data out your computers serial port, it gets transmitted from one xbee to the other, and then to the servo controller, the ssc-32 (http://www.trossenrobotics.com/store/p/3191-SSC-32-Servo-Controller.aspx)

As for a camera, you can go with tybes option...There is also the trendnet wifi cameras...but they are not as good as what tybes is selling.

If your going to have a gun, then you need a battle switch. (http://www.trossenrobotics.com/store/p/5467-BattleSwitch-radio-controlled-10A-relay.aspx)

On second thought, maybe we should know a bit more about what it is you are trying to do...I think I'm sort of assuming...

Also...check out the tutorials.

http://forums.trossenrobotics.com/tutorials/how-to-diy-128/building-a-mech-using-dbs-bracket-system-3099/
http://forums.trossenrobotics.com/tutorials/build-articles-130/build-your-own-issydunnyet-3257/
http://forums.trossenrobotics.com/forumdisplay.php?f=121

Hope this helps. I look forward to seeing what you come up with.

DB

TrevorBrummel
07-30-2009, 06:58 PM
Thanks, and yes, I am going to try and compete in Mech-Warfare.;)

darkback2
07-30-2009, 07:18 PM
um...just something to be careful about...

Mech warfare and mech warrior are in no way related. We wouldn't want to cause trouble for the event organizers.

DB

TrevorBrummel
07-30-2009, 07:49 PM
Sorry, my bad. I did mean Mech-Warfare. I need to pay better attention to what I'm typing.:o

lnxfergy
07-30-2009, 11:58 PM
If you're starting from scratch (you currently own almost no servos), I'd step back a bit, and first decide which way to go with servos.

Choosing between traditional or serial servo, will quickly help pare down which options are relatively good ones for a controller.

-Fergs

nagmier
07-31-2009, 12:33 AM
Welcome Trevor! This is a great place! You should really take a look around the tutorial section here as well, lnxfergy there has a pretty good write on his winning mech "Issy" its no blueprint by any means but its def a good idea to get your head wrapped around what kind of work is going to be involved. Also there are several others that may be of interest.

Also take a look at threads from the 2009 games, I'll try to dig up the ones with competitor commentary there are some real gems in there for future competitors, things that could save hours of headaches later I would think

darkback2
07-31-2009, 09:41 AM
If you're starting from scratch (you currently own almost no servos), I'd step back a bit, and first decide which way to go with servos.

Choosing between traditional or serial servo, will quickly help pare down which options are relatively good ones for a controller.

-Fergs

Fergs makes a good point, as does nagmier, which is why I included a link to the issy tutorial in my post above.

Here it is again in case your interested.
(http://forums.trossenrobotics.com/tutorials/build-articles-130/build-your-own-issydunnyet-3257/)
Also, Someone posted a thread about different types of servos...here you go. (http://forums.trossenrobotics.com/showthread.php?t=3403&highlight=digital+servo)

DB

TrevorBrummel
07-31-2009, 12:15 PM
Thanks you guys. This has all been really helpful. I'm glad I didn't just go out and buy something, because I'd probably be sitting in front of a desk full of incompatible parts. I'll have to take another look at what I was thinking of doing. All of the resources you guys set me up with have really helped me understand what I'm getting into much better.

darkback2
07-31-2009, 02:31 PM
Thanks you guys. This has all been really helpful. I'm glad I didn't just go out and buy something, because I'd probably be sitting in front of a desk full of incompatible parts. I'll have to take another look at what I was thinking of doing. All of the resources you guys set me up with have really helped me understand what I'm getting into much better.

Hey,

I just gave you a +rep. Thank you for taking the time to read through the posts that have already been written on the various subjects. There is a lot of info out there, some of which is deeply hidden, and a lot of people, myself included, don't always remember to do that, and its nice when people do.

DB

lnxfergy
07-31-2009, 02:38 PM
I'm just gonna put a link in here for my tutorial on So You Want To Build A Robot (http://forums.trossenrobotics.com/tutorials/introduction-129/so-you-want-to-build-a-robot-3126/) ... which links to most of my other tutorials. Not sure of your experience level, but I think that might be a useful read, if not for you, for those who might stumble upon this later.

-Fergs

TrevorBrummel
07-31-2009, 06:35 PM
I read the whole discussion on servos but didn't get an answer to this: will Dynamixel servos work with the SSC-32?

nagmier
07-31-2009, 06:47 PM
No, The SSC-32 is a PWM servo controller ...

I also think that there are very few that would disagree that the ax-12s are some of the best price/torque your going to get


Edit: Fair Enough Tybs, Fergs I see where I had the misconception thanks for correcting me.

DresnerRobotics
07-31-2009, 08:53 PM
No Dynamixels can be controlled directly via RS-232. They are half duplex TTL (for the AX series) and full duplex RS-485 for the DX, RX, and EX series.

Hobby servos use PWM, an entirely different signal type.

lnxfergy
07-31-2009, 08:57 PM
No, The SSC-32 is a PWM servo controller the dynamixel servos are serial rs232 or 485 depending on teh servo model

I also think that there are very few that would disagree that the ax-12s are some of the best price/torque your going to get

The higher end dynamixels are in fact RS485.. but the AX-12s are NOT rs232. They are a half-duplex serial bus, that's not exactly RS-232 (an important point to consider when deciding on controllers).

-Fergs

TrevorBrummel
08-01-2009, 09:53 AM
@Tyberius
Just wondering, what are you running on Hagetaka v2 to control you Dynamixels?

@nagmier, Inxergy, Tyberius
Thanks for the info, I did a little reading up on control types and that info really helped.

+rep

DresnerRobotics
08-01-2009, 10:23 AM
I'm using a custom Gumstix based controller with a bluetooth link to a PS3 controller. Not something I would recommend to anyone without extensive embedded computer experience. The only reason I was able to implement it was due to a massive amount of help from Farrell Robotics, which already had a working control solution around that controller.

TrevorBrummel
08-01-2009, 10:35 AM
Ok, Thanks