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View Full Version : [Question(s)] where should i start????



elios
09-27-2008, 03:10 AM
i visited 4mem8 today after his robot was in the newspaper, and i have really got hooked into robotics. I am a member of www.brightsparks.org.nz and i can get a 10% discount of lynxmotion products from sedonia.co.nz. I have already sent off some enquiries for prices of mechanical bits and pieces.

I really want to build something with reverse actuated legs for the mech wars, or something similar over here in NZ.

Where about should i start?

I already do PICAXE programming and i know bit when it comes to circuitry.

Thanks.

darkback2
09-27-2008, 01:08 PM
There are a lot of ways you can go, and it really depends on what you want to do. I would suggest hanging out at 4mem8's place for a while, playing with his bots, and deciding on a direction to start with. Rolling robots are easier to work with in the sense that you don't have to worry about balance and stuff...

It really all depends on where you already are. I would suggest a BOE bot or lego NXT kit for anyone who is just starting out, but thats just me.

DB

DresnerRobotics
09-27-2008, 02:14 PM
Welcome! If you're looking for a Lynxmotion based biped, the scout is a solid choice. I would however recommend going with 5990TGs, and 12 of those will set you back a decent amount, so it really depends on your budget. The plus side would be that you and 4mem8 could work together on getting it to walk.

Programming is the hard part in robotics in my opinion, so if you have a background with PICAxes you're getting a decent head start.

4mem8
09-27-2008, 02:43 PM
Hey thanks guys, I know elios will appreciate your feedback, I did mention NXT for mobile base type robots, but I think elios is taken by the mech war scenario, But as you say Tyberius, Those 5990TG's servos cost a bunch and maybe out of reach at this stage. I guess that the next one down is the HS 645's. Oh that reminds me Elios, Welcome to this site, you will enjoy yourself here.

elios
09-27-2008, 05:15 PM
Thanks 4mem8. I was just thinking about the costing problem... i decided that i would bookmark the manual for building the scout, and when i had the money i would by the parts i need, etc. so one week i might get some feet and the chassis, the next i might get some servos. Just building it up from there.

Otherwise would it be possible to make my own brackets out of aluminium?

4mem8
09-27-2008, 06:42 PM
You could, but these brackets are usually T6 grade and you have to be very careful that you do not fracture the bend, Plain alloy will flex under the stress and is not really suitable. good idea getting parts when you can.

elios
09-27-2008, 07:33 PM
yup, talking about getting parts when i can, i think i have just ordered myself a scout biped chassis from lynxmotion for about 26$$$ NZD including shipping!

4mem8
09-27-2008, 07:44 PM
Cool, That's a good start.

elios
09-27-2008, 07:50 PM
yep, so which were the digital servos that you recommened? 400 lb torque?

these ones?

http://www.sedonia.co.nz/s5475hb.htm

4mem8
09-27-2008, 09:58 PM
yep, so which were the digital servos that you recommened? 400 lb torque?

these ones?

http://www.sedonia.co.nz/s5475hb.htm

Not 400lb!! 440oz @7.2v [email protected] 6v HSR5990TGs Hitec.

Cheaper ones but quite good. Analogue

http://www.trossenrobotics.com/store/p/3292-Hitec-HS-645-MG-high-performance-hobby-servo.aspx (http://www.trossenrobotics.com/store/p/3292-Hitec-HS-645-MG-high-performance-hobby-servo.aspx)

Mid range digital.

http://www.trossenrobotics.com/store/p/3295-Hitec-HS-5645-MG-digital-hobby-servo.aspx (http://www.trossenrobotics.com/store/p/3295-Hitec-HS-5645-MG-digital-hobby-servo.aspx)

Digital more expensive. Recommened.

http://www.trossenrobotics.com/Hitec-Servo-HSR-5990TG.aspx

Robot base plates for the 5990

http://www.trossenrobotics.com/store/p/5557-HSR-5990TG-Case-Set.aspx


Hope this helps you out elios.

elios
09-27-2008, 10:09 PM
thanks 4mem8, so with the legs is it possible to use the cheaper analogue "high-torque" or will they be to weak?? or should i use the mid range digital ones, as the recommended one are quite expensive?

DresnerRobotics
09-27-2008, 10:25 PM
5645MGs are absolute minimum with a scout, and you would really have to keep payload weight in mind and to a minimum.

elios
09-27-2008, 10:49 PM
okay, thanks tyberius.

elios
09-27-2008, 10:54 PM
what is the program editor that you use? is it the SSC-32 sequencer from lynxmotion?

DresnerRobotics
09-27-2008, 11:10 PM
Yup, that's the one. Believe you can export the sequences you make into a 'Basic Atom' compatible code too.

elios
09-27-2008, 11:49 PM
okay, start from the beginning please... to program the chipset in the robot you use this SSC-32? this also controls everything from servos to rangefinders and even webcam set ups?

4mem8
09-27-2008, 11:57 PM
You use the SCC32 sequencer program to set the end points of the servos and to run sequences, this can be exported to a basic stamp or Atom pro say on a BotBoard2 or Board of education [Parallax] web cam you will probably have to download roborealm for the vision system. I still have to do this myself yet when I get J5 and ED209 going, But this is as I understand it. Any sensors will have to be programed in as separate code to the basic stamp or Atom pro.

elios
09-28-2008, 12:07 AM
okay, thanks.

I can always cross that bridge when i come to it.

darkback2
09-28-2008, 03:21 AM
Not to be a jerk or anything, but how much of a beginner are you? You may be biting off a lot more than you can chew right off the bat. I suppose nothing sucks worse than getting in way over your head with a robot and not being able to get where you want.

DB

darkback2
09-28-2008, 03:36 AM
Ok...so here is the deal. your going to need a complete scout chassis...260 NZD, and 12 servos at $75 NZD a piece = $900 NZD Add to that batteries at $50 NZD a piece and a controller another $58 for the SSC-32. Thats well over a grand not including shipping for a beginning robot? that is going to be really freaking hard to get running. That isn't including guns, a camera a controller, or any sort of wireless system you may want to add.

My advice is to walk before you run. Its going to be boring as hell sitting around waiting for parts...unless your into that sort of thing. Personally if you are dead set on competing in Mech Wars, consider putting that project off until you have a better understanding of robotics in general, or get a robotics kit that is meant for beginners. consider a bioloid kit which in the least has pose and capture programming which will make what your considering a lot more doable, and cost a lot less.

In anycase, thats my two cents.

DB

4mem8
09-28-2008, 07:59 AM
Good sound advice darkback2, Definitely not a cheap exercise, and a Bioloid kit may be the better choice.

Alex
09-28-2008, 03:44 PM
I'm with DB on this one. You want to be careful to not bite off more than you can chew. I'm not trying to discourage you, but robotics is some complicated stuff.

All too often I've seen people start off with a complicated robot like a humanoid, only to see several weeks later they're selling it on eBay cause they gave up, realizing they just got in way over their head.

The Lynx products are great, but I wouldn't say they're geared towards beginners. I'd suggest checking out a Bioloid kit. What's great about Bioloid is the same as with Lynx; They're modular and you can keep adding to them as you learn more about it. But with the Bioloid, it's much easier to figure everything out.

elios
09-28-2008, 04:18 PM
Thanks for all your concern. i have always wanted a project where i can plod along at my own pace with it. with my experience, i have written a few computer programs in basic, and i have done a year and i half of programming PICAXE ICs.