Let's Make Robots!

Stomper - 3 servo hexapod

Navigates around using ultrasound

This is "Stomper", a 3-servo walking robot I built a few years ago from plans in Karl Williams "Insectronics" book. I've resurrected him from my robot junk pile to be my first robot posted here. He wanders about making noise until he runs out of battery power or we get tired of him stomping about frightening the cat or one of our dogs. He uses an SRF04 ultrasonic ranger to "map" the space in front of him and avoid obstacles.

Since several here are asking a bit more information.  Here's another go... :-) I've attached a few more photo's and a bit more description for those that who are interested in the mechanical details.


Top view

Stomper, top view

Bottom view

Stomper, bottom view


Here is a link to the "Insectronics" book on Amazon, you might be able to find a copy at your local booksellers as well. If you want to build one, be forewarned this isn't exactly a beginning project! You will need to make pc board if you follow the directions in the book. You will also need a Pic programmer to program the PICmicro 16F84A. I built my programmer from another book - the "el-cheapo programmer" from "Programming and Customizing PICmicrontrollers" by Myke Predko.

The software demonstrated in the YouTube video is straight out of the Insectronics book, this link: minimap.bas will show you the code I used. You could also use room-mapping.bas for nearly identical behavior - though a bit more open to some fun hacking!

If you are good with translating code, it should be easily adaptable to a BASIC Stamp or  PicAxe (that is so popular here). Since the pc board is very close to the same size as an Arduino I am tempted to convert to that (maybe I will sometime, hmmm).

Stomper is built of hobby aluminum I found at my local hardware store, as well as the little rubber bumpers I used for the feet. You will need some basic metalworking tools to build the body - a hacksaw, a drill, a tape-measure, and a screwdriver should do it. The book assembles him with small bolts, I used pop-rivets on the non-moving frame parts, bolts and lockwashers elsewhere. I also put a dab of superglue in the leg joints as the bolts loosened from walking.

In case anyone wants to know Stomper is about 21cm x 20cm, stands about 10cm tall (~ 8.5" x 8", 4" tall)

Have fun!



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Hi droidbuilder


I'm impressed, it looks great


maybe you can help with something

i have build a similar hexapod but it's not as nearly moving so fast

have you any explanation for it

i took out all pauses in teh program up to teh point that the servo's were working anymore as the were moving in one direction while the program already told them differently


is it a matter of faster servos'?




Very cool. I love how you found a way to use 3 servos to build a hexapod. Very inspiring. 

The world's best motto: When all else fails, use a bigger hammer.

I like this one! Like a kind of robotic spider!

i love this machanical concept, very simple and efficent

i will build one of those exapod 

a question: is not the sonar ranger too near to the floor? do it gave to you any false reading due to floor proximity?





When I saw this design, I wondered about it too. The centerline for the ranger is about 5.5cm from the floor. But the near proximity to the floor does not seem to be much of a problem in practice. Stomper reacts to objects within 1/2 meter. Much closer and he turns or backs away.
very professional looking! congrats!!
I like the way he moves  :)
my id is vsh_7@yahoo.com plz send to this
As he says he copied it from "Karl Williams "Insectronics" book" I would look there for plans and details on how to build and code.
hey iam harish from India. can u give me the ful matter about ur stomper

I like the way it walks. He really marches!

Well done!