How to Build a DIY Comet Crawler Robot

2025-09-10 | By Odd_Jayy (Jorvon Moss)

License: See Original Project 3D Printing Motors Servo

Here is the first version of the Comet Crawler project. Originally, I just wanted to test myself to see if I could make something crawl. The outcome was this simple assembly project. If you’d like to make your own, follow the steps and let us know how you took this project and made it your own. The original project idea was based on the Kame robot.

robot_1

Parts List:

I tried to keep this project relatively low-cost by keeping a low part count.

count_2

Programming:

This part is very important. Originally, this wouldn't work without a specific Arduino library, called Octosnake, which originated from the original Kame project. I had to edit it a bit, but this project will not work unless you have this in your Arduino Library. You can download this library and code for this project here:

Download Code

This code will first start off by making your robot stand up. It sets all the servos to 90° before it begins to walk.

Assembly.

I've added the step files for anyone who wants to edit anything, but the assembly process is pretty simple. I recommend printing the base first so that you can secure everything in place. You can find all the 3D model files here:

3D Model Files

assembly_3

Your circuit board should look more or less like this: the Feather boards stack upon each other, and this project uses all of these servo pins.

feather_4

Next, I recommend attaching the servos to the base. The servo horns should be facing outwards.

outwards_5

Next, I would recommend attaching the legs. The legs are pretty simple, and they use 3 mm screws or rods to fasten together. This part is particularly fun in my opinion because if everything is done correctly, your robot should stand up.

stand_6

attach_7

After that, you can easily attach the head, which you can do with some small screws. I left a lot of room in the head to stuff the batteries. The board and the servos have to be powered separately, so you're going to need two types of batteries. I also wired it with push buttons so I can turn the robot on and off.

wired_8