I am so proud of all of my students, especially when they tackle and conquer difficult projects, like one of my students did recently when she completed a prototype of her Mini Robotic Table.
… A Robotic Table?! Heck yes!! It is just as hilarious and awesome as you are imagining.
But like most projects, the build process was challenging and frustrating, but also delightful and oh-so-rewarding.
This young lady started this project at the age of 10 years old. Initially, she wanted to build a full-size table. After building a real table from scratch and adding wheels, together we discovered that adding remote control to this heavy object would be very challenging and expensive.
So, we revisited her concept and she decided to scale the table down to American Girl doll size. *swoon* SO CUTE.
For the next few months, my student took what she learned from building the large table, and created a miniature version that perfectly fits the height of her adorable American Girl dolls. She successfully built the table, added wheels, and build a remote control system to drive the table around.
I guided her throughout the process and assisted where necessary, but the concept and all of the build was done by her hands. Further proof that kids and young folks are capable of so much when we provide them with opportunities and just a lil’ bit of guidance. If you have children of your own, or if you are an educator, trust that they are so much more capable than we think! Challenge them, give them tools and supplies and let them freely create the things they want to — I promise, they will learn so much more than if we force them to learn the things, and in the ways, that we think we should, simply because “that is the way that we have learned.”
Remember Grace Hopper’s brilliant advice: The most dangerous phrase in the language is, “We’ve always done it this way.”
Create, build, and play an obstacle course for Brush Bots! This is an activity for all ages that teaches the basics of circuits and design thinking while encouraging and inspiring creativity, discovery, and collaboration. Most importantly, it’s super fun! (But seriously though, watch the video it’s adorbs and will make you smile)
This tutorial will show you how to build (and source parts for) a Brush Bot, how to design and build mini golf inspired obstacles, and how to use the design thinking process to create a Brush Bot that can accomplish each of the obstacles. Go forth and build your own Robot Mini Golf course!!
Conductive material (e.g. copper tape, wire, paperclips, aluminum foil, etc.)
2. Brush Bot Body & Feet
Since there are tons of ways to build the body, no list is absolute. Here are some suggestions (upcycling materials are highly encouraged & also cut down on cost!):
Toothpicks and/or wooden skewers
Cardboard, cardboard, and more cardboard!
And maybe throw in some electronics in there also (see Step 4) 🙂
What the heck are Brush Bots??
Brush Bots, or Bristle Bots, are the simplest possible form of a robot: a motor with a counterweight and a battery attached to simple body. The counterweight causes the motor to shake, which, in turn, causes the body to shake.
The name “Brush Bot” comes from
a common design that uses toothbrush bristles as the “feet”. The term has been adapted to refer to any simple robot based on the counterweight motor design. Another super fun variation are Art Bots, which use markers or other materials to draw while they wobble around!
There are tons of ways to build a Brush Bot. A couple of approaches are shown in the photos. What other ways can you invent to build a Brush Bot?
Building the Obstacles
My obstacles were inspired by mini golf and through my experience in teaching Brush Bots and seeing various approaches from students and educators. I wanted obstacles that would be fun, accessible, and interesting for kids and adults, so I came up with four obstacles of varying difficulty.
Obstacle 1: Enter the Arena
Starting from 1 – 2 feet away, the Brush Bot must enter the opening to an arena. This can be made by marking an arena with tape, or by building a simple fence from cardboard.
Obstacle 2: Spiral Maze
The spiral maze is a crowd favorite and is a great obstacle for younger kids to tackle. Build the spiral maze by scoring a long piece of cardboard (~ 4 feet), then gluing it in a spiral pattern on a 2′ x 2′ cardboard square.
I decorated mine to look like a galaxy by spray painting the outside gold and the inside black, then gluing glow-in-the-dark stars on the inside.
Obstacle 3: Ramp
Although easy to make, this obstacle has proved to be the most challenging. I recommend using a low incline (less than 15 degrees) and adding a rough surface (e.g. sandpaper) on top of the cardboard.
Build the ramp by cutting out two identical triangles and then adhering a cardboard square on top.
Recreate or modify this Robot Head or create your own whimsical obstacle!
Building the Brush Bot(s)!
1. Dismantle and gut an electric toothbrush! Your mission: find the motor.
For the Assure-brand “Soft Bristle Electric Toothbrushes” that you can get at the Dollar Store (just $1 woot woot!), twist off the bottom, pull out the battery holder, and pull out the motor. You may need to tap (or hit) the open toothbrush on the floor to get the motor out, or (gently) use pliers to pull it out.
2. Grab (or build!!) a battery box, and connect the positive side (red wire) to one of the motor leads*.
3. Connect the negative side of the battery box (black wire) to the other motor lead.
Orientation doesn’t matter — try switching them and see what happens!
4. Design and build a body for the lil ‘bot and give it a way to move. Iteration through different designs is recommended and encouraged!
Some common and easy ways to make the Brush Bot move are to use toothbrush bristles, toothpicks, or popsicle sticks to make legs/feet. Try different objects and object placements to see what happens.
*The motor leads are those gold tabs with holes by the white cap of the motor.
Conquering Obstacles W/ Design Thinking
Design Thinking is a problem-solving method. Traditionally, it’s applied for design of hardware and software products in various engineering disciplines, but this process can be applied to pretty much any aspect of life. The Design Thinking process comes in variety of flavors, here is a common breakdown:
1. Design: Who is your audience? What, or who, are you designing for? What are constraints for your product/project?
2. Ideate: How can you solve this problem? Come up with at least 3 – 5 different approaches — impossible solutions are totally acceptable in this phase.
3. Prototype: Choose one of your (possible) solutions and build it.
4. Test/Observe: Test your prototype and observe how it behaves. Does it solve your problem? If not, what’s wrong with it? If it does, can it be done in a simpler or easier way?
5. Adjust: Change your prototype based on your testing and observations.
Repeat steps 3 – 5 until you’ve arrived at a solution that solves your problem, satisfies your audience (or teacher), and meets any design constraints.
You can go through the design thinking process before, during, or after the workshop. One of the benefits of having obstacles to conquer is that it motivates students to naturally go through this process without having to sit and think about it.
Compete & Add Prizes
That’s it! You’re ready to tackle and challenge your students, friends, and/or family to a game of Robot Mini Golf!
A bonus feature would be to add prizes for anyone who successfully completes either one or all of the obstacles. My favorite method is to give out small prizes (e.g. stickers or buttons) to anyone who builds a Brush Bot that completes at least one of the obstacles, and a larger prize for anyone whose Brush Bot successfully completes all of the obstacles. This is a great way to adapt this into a workshop for folks of all ages — older kids and adults can try to conquer all of the obstacles while the younger kids still get to participate and have a blast! 😀
Please feel free to share your Robot Mini Golf stories in the comments! Would lovelovelove to hear anecdotes of how this activity went with students and/or to see photos of your unique Brush Bot(s) and obstacle course creations!