Instructables
Picture of FOBO bipedal walking robot
FOBO is the fourth prototype from Project Biped.  It is a 3D printed, self-contained, statically balanced, bipedal robot. It has 8 DOF (degrees of freedom) and can walk around its environment and avoid obstacles using an ultrasonic range sensor.  All of the designs, instructions, source code, and parts lists are provided for free.  FOBO was designed to be easily made by anyone with a low cost 3D printer and an interest in learning about robotics. 
 
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Step 1: Static walking

Picture of Static walking
FOBO walks statically meaning that at every frame of the animation it is balanced and won't fall over if it stops.  The walking cycle is 10 key frames with 10 frames interpolated in between each frame.
 

Step 2: Get the parts

Picture of Get the parts
FOBO uses an Arduino Uno microcontroller to actuate 8 servo motors.  It also has an ultrasonic range sensor so that it can walk around without bumping into things.  FOBO is powered by a rechargeable lithium ion battery that lasts for a couple of hours on a full charge.   All of the parts together cost about $200.  Here is the full list of the the parts along with links to the vendor, price, and quantity.  Note that none of the vendors listed are affiliated with Project Biped ... they are just where I bought my parts from.  If you find a part cheaper from another website let me know and I'll update the list.

Step 3: Print the robot parts

Picture of Print the robot parts
FOBO is made up of 17 3D printed plastic parts.  The full list of diagrams showing where each part goes can be found here and all 3D stl files for each part can be downloaded here.    I printed FOBO using an open source Makerbot Thing-O-Matic 3D printer.  All of the parts can be printed in about 18 hours (depending on your printer and settings) with about $10 worth of plastic (193 cc is about 1/5th of a standard spool of plastic).

Step 4: Set up the servos

Picture of Set up the servos
FOBO uses 8 servos to move around.  These need to be aligned before construction begins to make calibration easier.  You can access the presentation with animated instructions here (the image is a screen shot of the presentation). 
naorocks2 days ago
I hope I can build one
robobot31124 months ago

good but costly (i mean 300 usd)

rohals8 months ago

please suggest the proper program or proper arduino coding for servos bcoz i followed all steps u suggested but while compiling its showing error and code is not processing further so please suggest proper and right coding as soon as possible...

nice project. i like it dude
mithun tr1 year ago
I love this robot i am going to make it
richimf1 year ago
I love this tutorial, Wow :D
H3ll32 years ago
Amazing project, where can i find the pieces to make the head and the legs, do u use a 3d printer? :)
Awww, that's one cute little robot! :-)
chuckcrunch2 years ago
have you heard of
http://letsmakerobots.com/
jdowdall (author)  chuckcrunch2 years ago
Thanks for sharing the site. It looks like FOBO would fit in well ... I'll have to make a post there for sure!
Could this be made for those without a 3d printer?
jdowdall (author)  javajunkie19762 years ago
There are websites that will print 3d files for you. I checked out everyone I could find to see how much it would cost for people without a 3D printer to have the plastic parts for FOBO made. The results were ridiculously expensive. The cheapest site was Shapeways which cost around $360 with shipping. That is about a third of the cost of buying a new Thing-O-Matic 3D printer from Makerbot. My advice would be to buy a 3D printer and print the parts yourself rather than pay for someone else to make them. Once you have your own 3D printer it will take about 18 hours to print and consume around 1/5 of a spool of plastic (that's about $10 worth of plastic). If for some reason you don't want to get your own 3D printer I can make the Shapeways FOBO files public so that you can pay them to have it printed ( although it would pain me ;-).
profpat2 years ago
great project!
Oh wow, that's pretty amazing!
Mit1232 years ago
Love it, reminds me of the biped walkers in Star Wars ;-)
nnygamer Mit1232 years ago
ATST-- I thought the exact same thing. aka chicken walkers
I knew I wouldn't be the first person who had this as their first thought. Guess that galaxy isn't so far, far away!
XOIIO nnygamer2 years ago
It wouldn't be too hard to mod the case either, that would be epic XD
Mit123 XOIIO2 years ago
Now that really would be cool!!!
I know I'm such a geek :-/
Same
SCIENCEPAL2 years ago
Awesome project dude!!!!!!!!!!!!!!!
botguy242 years ago
Yet again wow! your bot looks so professional! It moves so smoothly too. must have been fun getting it to balance with that big box on top!
jdowdall (author)  botguy242 years ago
Thanks! There were lots of face plants while I was working out the walking cycle ... but that was half the fun. Future designs will have the batteries in the feet to help with the weight distribution.
wow It's cool.
axeman9112 years ago
Wow that is really cool!