Introduction: Soft Robot Out of Hot Glue Sticks
Here is an inspiration for you on how to make a soft robot in less than an hour!
Okay, it is not exactly soft you will argue, but it has some soft parts - the glue sticks! Not only they are soft, but they have a very important feature - they form the body of the robot and they act as springs. It is important to realise that their springy quality is used to drive the robot forward.
The robot is able to move because its tail has very little friction with the ground when moves in one direction and very high friction on the opposite direction. The tail is simply pulled forwards by the two ropes. Then they release, the springy quality of the glue sticks pushes the front forwards while the tail is stuck to the ground.
Check the video and you will see what I mean.
Step 1: Stuff You Need
The list is very simple:
- Some thin nylon rope
- Hot glue and sticks
- Servo
- Arduino (Uno or Mini or any other microcontroller that can drive a servo)
- Battery
Step 2: Hardware Assembly and Software
Connect your servo to the microcontroller and power supply. I used two servos to give me more power on the ropes, but it is up to you and the actual servos you find. Then program the microcontroller to swing the servo backwards and forwards. Check the code attached.
Finally, put your robot together! Stick the servo in a box and feed the rope through it. Stick a glue stick to the box and bend it. Tie the end of the rope to the free stick end and that is it! Use my diagram as a reference, but feel free to experiment on your own. There are infinite number of solutions. Share them in your comments below.
The boxes that house the microcontroller, battery and the servo are 3D printed - not the cheapest way but it looks neat!
Step 3: Testing on Different Sirfaces
It is able to crawl over artificial grass, smooth plastic and rough terrain. I had to add spikes to the tail to make the friction greater on the grass terrain.
Step 4: Race!
It isn't rocket science, but it is cool!
Thanks for checking! Please vote for my instructable in the contests if you've found it inspirational!
Share your thoughts, comments and designs!

Runner Up in the
Hot Glue Challenge

Participated in the
3D Printing Contest

Participated in the
Move It
17 Comments
5 years ago
Hi there, great!!
I want to make one but what did you use for the 'soft spine'?
7 years ago on Introduction
' 3 ' er mer gerd so cool!
Reply 7 years ago on Introduction
Thanks!
7 years ago on Introduction
hang on I forgot what I was gonna say and that's SUPER COOL! I'm big in robots ;3
7 years ago on Introduction
um I like it...
7 years ago on Introduction
its like a cool bionic caterpillar, can you make it turn somehow?
Reply 7 years ago on Introduction
It must be possible by adding two extra servos. I imagine it like they will be changing the friction with the surface and make the robot steer.
7 years ago on Introduction
That's so cool.
7 years ago on Introduction
fun idea!
7 years ago on Introduction
This is awesome! Are you going to upload it to the soft robots competition?
Reply 7 years ago on Introduction
Thanks Sebastian! Which competition are you talking about?
Reply 7 years ago on Introduction
http://softroboticstoolkit.com/design-competition
7 years ago on Introduction
Incredibly awesome but surprisingly simple. Looks like a nudibranch.
Reply 7 years ago on Introduction
Thanks Slime! I did not even know what a nudibranch is but now I do ... haha it actually looks like one for real I think because of the orange spikes it has!
7 years ago
this is cool, love it
7 years ago on Introduction
Superb.
7 years ago on Introduction
This is so bisare and completely amazing! I can't keep from watching that video.