Archer, an IK controlled biped

:smiley: :smiley: :smiley: :smiley: :smiley: :wink:

A video!!! :open_mouth:

Ok, I’m ready… :open_mouth:

I got my Discount movie tickets!!!

http://www.horsham.org/images/departments/parks/movie-tickets.jpg

no pressure Kåre. :laughing:

This guy is a star :smiley:

Hold on, eat your popcorn before it get ©old… :laughing:

I’ve decided to call him Archer (written ARCher), simply because I’m using the ARC-32 board. I’m still in the building process, yesterday I made the battery holder and have started organizing the wires. I did also decide to go for reversed knee (simply turning the robot 180 deg), and the feet are replaced from ARF-01 to ARF-02.

I hope to post some pics soon, the video have to wait a little…

I’m glad to hear you are doing the reverse knee configuration. There have been so many failed attempts at doing this leg style by hobbiests due to many reasons. I know that it can be done, and I’d be willing to bet that you will make it look elegant. 8)

Hi,

I’m sorry for not posting anything interesting (pics or video) yet. I’m just so very busy at the moment with other stuff lately and we are soon starting our vacation (= very little robotic time).

But I’m very proud to say that I’ve got my Archer walking very good! :smiley: So far only sideways and forward/backward walking. The gait work very well, I even had it walking outdoor on different surfaces (terrace planks, outdoor stone tiles that are a little uneven). When Archer walks he actually lift his legs, without dragging them along the floor. I added a factor that compensate for the gear backlash (gear slop ?) when one leg is lifted so that the body still holds a level position. The leg-lift-height can be adjusted easily. I do hope to post a video soon. Most of the mechanical work is done, all the wires are tied up. He is powered by one small LiPo 2S 1700 mAh. I need to do some more mechanical stuff to make it look better though.

Btw, I’m soon starting to post information about my current robotic projects and info about all my projects in a personal blog. I’ll let you know when it’s ready.

No problem about not having the time to post images and videos. It’s not a race :slight_smile: you should take your time and enjoy the project and not be pressured to produce progress. I certainly enjoy your work and will take it at any pace you choose.

Backlash seems the right term for the “slop” you are talking about. My metal gear servos experience the same thing. This all sounds really exciting! Hope you have a great vacation!

Sounds like you are having some fun!

If we don’t hear anything, I hope you have a great vacation!

Kurt

Thanks Mike and Kurt!
I do hope to post something over this weekend since we are not leaving yet (bad weather…).

Hi,

Here is a little video of Archer just doing some simple walking. I’ve not implemented turning yet. This video is about a week old and I’ve done several improvements to both code and hardware. I’ll post more info later. :wink:

great work. the IK looks great. very impressed once again. thanks for sharing Kare.
looks great when it walks towards camera. :wink:

Great video!

I have a question? Is the internal COG shift occurring because of gravity or do you drive the carrier boards on the rails with a servo or other drive source?

Looking forward to see Archer turn on its own…

dj

Thanks for your comments!

Hi,

I’m using a servo for moving the ARC-32 board, Turnigy regulator, XBee module and the battery for shifting the COG internally. In addition the body also need to shift a little though. These pictures should give you an idea of how it works:

Great job !
I’m loving it :smiley:

Looks great!!!

You are doing a great job on this (as usual) :smiley:

Kurt (or in the video Kurth) :laughing:

Thanks guys!

:blush: Sorry about that typo… I’ve no idea where that extra “h” came from :unamused:

Whoa! Wow that’s awesome. Keep up the good work! 8)

OK, that’s a little freaky!

Alan KM6VV