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raspberrypiguy1
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Biped Robot anyone???

Sun Sep 23, 2012 5:27 pm

I was just wondering if anyone has made and programmed a Biped Robot with their Pi... It would be a cool project! If anyone has what kind of equipment did you use? A pre-assembled chassis? I was thinking of making one with this kit (http://www.ebay.co.uk/itm/Arduino-Biped ... 231a80716a) ... But of course with no electronics in it! I was just curious of any of your thoughts!!!

The Raspberry Pi Guy :D
Matt, The Raspberry Pi Guy YouTube channel, author of Learn Robotics with Raspberry Pi, available now: http://mybook.to/raspirobots, Computer Science & Electronics Undergraduate at The University of Edinburgh

Ravenous
Posts: 1956
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Location: UK

Re: Biped Robot anyone???

Mon Sep 24, 2012 8:20 am

How long will the servos last?

I suggest you have a good long look at the Trossen Robotics Forum - walkers section (and your wallet, and your diary) before you get into this kind of thing... time is money, and money doubly so.

Doing the inverse kinematics for controlling the leg positions would be cool, though...

pygmy_giant
Posts: 1562
Joined: Sun Mar 04, 2012 12:49 am

Re: Biped Robot anyone???

Mon Sep 24, 2012 10:18 am

There might be some applicable principles on the balancing robot thread. Crude shuffling forms of locomotion in a Robosapien sort of way might be most easily achieved. Tamyia do cheap animal 'robots' that walk on 4+ legs using 1 motor and linkages - a variation of that with more legs could also be easier to achieve. I expect a biped robot would be acheivable, but it would take some doing - and some time - and some cash - and a better man than me!
Ostendo ignarus addo scientia.

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raspberrypiguy1
Posts: 379
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Re: Biped Robot anyone???

Mon Sep 24, 2012 1:46 pm

Yeah, I don't want to spend that much!!!! That was just an example! You might of come across those 'Wowee' products like those Robosapiens you mentioned.... They might be easy to Piize... (That meaning to 'intergrate something with the Raspberry Pi) ;) ... Anyway, I can dream! :D

Thanks
The Raspberry Pi Guy
Matt, The Raspberry Pi Guy YouTube channel, author of Learn Robotics with Raspberry Pi, available now: http://mybook.to/raspirobots, Computer Science & Electronics Undergraduate at The University of Edinburgh

Ravenous
Posts: 1956
Joined: Fri Feb 24, 2012 1:01 pm
Location: UK

Re: Biped Robot anyone???

Mon Sep 24, 2012 2:00 pm

Trouble with these kits is that servos are pretty expensive - though when you think about it they ARE quite nice position-controlled motors, so I don't see a decent way to drop the price without buying your own low-ratio gearboxes, encoders and doing lots of microcontroller programing.

I just did a search and found one of those fairly expensive dinosaur ones, stripped down. Quite a lot of electronics in there! I have no idea what it's using for position encoders (if anything). All in fun:

http://www.ifixit.com/Teardown/Pleo-Teardown/597/1

I guess as a minimum two legs could be done with 4, 5 or 6 servos, maybe...

pygmy_giant
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Re: Biped Robot anyone???

Mon Sep 24, 2012 3:28 pm

cheapest servos I've found are about £3.50 on ebay...

servo control would need to be done via a second micro controller or expansion board... my balancing robot's micro controller board can handle 4 servos, but you would really need more as walking incorporates some side to side motion (hips) and ankles - unless you are oscar prestorius.
Ostendo ignarus addo scientia.

Ravenous
Posts: 1956
Joined: Fri Feb 24, 2012 1:01 pm
Location: UK

Re: Biped Robot anyone???

Mon Sep 24, 2012 3:57 pm

Yep but cheap servos will probably not be reliable enough for the wear and tear - I get the impression most servo bearings aren't designed to be used as load-carrying elements.

For fun: more novelty designs, here's an old page that's been up for years - silly looking toy robots but some quite fun mechanisms, especially Scarlet and Cat:

http://www.davidbuckley.net/RS/RogerStarnes/index.htm

Devantech do some expanders to drive lots of servos, again no idea if this stuff is any good:

http://www.robot-electronics.co.uk/acat ... llers.html

pygmy_giant
Posts: 1562
Joined: Sun Mar 04, 2012 12:49 am

Re: Biped Robot anyone???

Mon Sep 24, 2012 7:04 pm

Frea looks fun - and only 4 servos!

http://www.davidbuckley.net/DB/Frea/Fre ... /index.htm

I have no experience of servos but accept that you get what you pay for
Ostendo ignarus addo scientia.

pygmy_giant
Posts: 1562
Joined: Sun Mar 04, 2012 12:49 am

Re: Biped Robot anyone???

Thu Sep 27, 2012 12:44 am

This would be a good start: http://www.ebay.co.uk/itm/6DOF-Biped-Ro ... 46082b4904

controlling the movement in a meaningful way would be a challenge!
Ostendo ignarus addo scientia.

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