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Prodos - Bipedal Robot

by jdow, published

Prodos - Bipedal Robot by jdow Aug 6, 2011

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Description

Prodos is the second prototype robot from Project Biped (http://www.projectbiped.com) whose goal is to create an open source 3D printed dynamically balancing walking robot. Prodos was designed to demonstrate how to coordinate simple limb chain actuation using a microcontroller. It has 8 degrees of freedom (joints) and can perform a simple walking action. The servos used were selected for economy and aren't powerful enough to bear the robot's own weight, so Prodos must be externally supported while it is executing its walking action. See a video of Prodos in action at projectbiped.com/prototypes/prodos/walking-analysis

Prodos has the following features:
*Uses an Arduino Duemilanove microcontroller
*User interface via OLED display and 4 button panel
*8 degrees of freedom
*Detailed assembly instructions

Recent Comments

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It uses 7g servos. See the link for the parts manifest in the instructions for details. Be advised that the servos aren't strong enough to actuate the robot under normal conditions (you'll have to pick it up to see it move). If you want to make a robot that can walk search for FOBO or ROFI.

What size servos is this designed to use? "regular" size, or 9g? I know there are more, but those seem the most common. Though I'm not that familiar with the different types..

hobbyking.com has similarly spec'd 55g servos for ~$8

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allanonmage on Feb 11, 2013 said:

What size servos is this designed to use? "regular" size, or 9g? I know there are more, but those seem the most common. Though I'm not that familiar with the different types..

jdow on Feb 11, 2013 said:

It uses 7g servos. See the link for the parts manifest in the instructions for details. Be advised that the servos aren't strong enough to actuate the robot under normal conditions (you'll have to pick it up to see it move). If you want to make a robot that can walk search for FOBO or ROFI.

ace42588 on Oct 15, 2012 said:

hobbyking.com has similarly spec'd 55g servos for ~$8

bryanandaimee on Sep 6, 2011 said:

You might try springs as a way to unload the servos. I've had good success using tension springs to allow a 2 DOF quad to walk with weak servos.

jdow on Sep 8, 2011 said:

That sounds interesting. Are there any resources on using tension springs you'd recommend?

GeoDelGonzo on Aug 13, 2011 said:

I like that first picture, it looks like Prodos has arms and he's raising them for joy :P

jdow on Aug 13, 2011 said:

I call that the T-Rex step ;-)

Webca on Aug 8, 2011 said:

Very cool:)

jdow on Aug 9, 2011 said:

Thanks! I think your CUBE record for using the most plastic on a single project is safe ... at least for a few more prototypes ;-)

Anonymous on Aug 7, 2011 said:

Might want to look at the Lynxmotion Biped Scout: http://www.lynxmotion.com/c-67... I always their SES (Servo Erector Set) could be efficiently 3D printed instead of made from aluminum.

Would love to see it really walk with something like HSR-5590TGs.

jdow on Aug 9, 2011 said:

That's a cool robot ... and at under $200 it is a good value. Based on the close up pictures, it doesn't look like there is any positional feedback from the servos. A single one of these servos you mentioned (HSR-5590TGs) is almost more than the robot! Maybe too expensive for a hobby project? For the next prototype I've been looking at the T-Pro MG996R 55G

http://www.hobbypartz.com/serv...

which has some nice specs for a $12 servo. Do you have any suggestions for a good servo in the under $20 range?

booktinker on Aug 7, 2011 said:

This is very cool! Will its successor have jump jets and rocket launchers? ;)

jdow on Aug 9, 2011 said:

Maybe a few generations down the line ;-) I guess it could be combined with the quad-copter design I saw posted on Thingiverse to make it fly...

owais on Aug 7, 2011 said:

so how will you attach stronger motors?

jdow on Aug 7, 2011 said:

The next prototype will be a bit larger to accommodate beefier servos. I've been experimenting with 55g servos

http://www.hobbypartz.com/serv...

and been pretty happy with the results so far. I've also redesigned the joints to avoid having to use the radial ball bearings.

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