The Dodo

In fall of 2016, Kelly and Shaun embarked on one of their more ambitious projects – converting a broken down wheelchair into a fire-breathing, animatronic dodo bird. This page was set up to catalog our build.

Concept Sketches

Dodo Breathing Fire

The fire-breathing Dodo bird

 

Dodo Front and Chariot Front

Dodo Front and Chariot Front

 

The Dodo and Chariot

The Dodo and Chariot

 

 

Chariot Rear View

Chariot Rear View

 

Person riding Dodo without chariot

Person riding Dodo without chariot

We set started this project by rebuilding an old electric wheelchair we picked up on craigslist for $100. The batteries and control electronics were shot, and a few pieces were missing.

The Perimobil c300 needing some love

We started by stripping off the chair with its associated actuators and controllers.

Teardown in progress

The wheelchair controller was dead so we needed to figure out how to wire in our own. The photo below shows the c300 wheelchair motor controller wired into an Arduino for initial testing.

Motor Control Circuit Board

Perimobil c300 wheelchair motor controller

Once it looked like it was working on the bench we wired it onto the wheelchair.

Arduino powered wheelchair

This was a test if we could control the wheelchair motors with our own hardware

 

Motor tests with the Arduino left something to be desired, the PWM frequency out of the little guy was just not enough to drive the motor controller.

We replaced the Arduino with a more powerful microcontroller, and ARM32F0 which then allowed for smooth motion

Once we had the wheelchair platform responding to our commands we decided to try riding it around a bit!

 

Now that we were sure the wheelchair was working, it was time to break it down and build a model of it.

We completely disassembled the base, carefully measured each component to build a 3d model. This allows us to design large portions of the Dodo before we are at the shop throwing sparks.

Wheelchair CAD Model

 

The CAD model took us nearly a month of difficult work to complete. The benefit of creating this model is we can bring a complete set of spare parts in the event something breaks. We know every washer, every bolt, every spring, and every bearing on our little bird.

Wheelchair CAD model

 

Since the wheelchair was now in pieces we gave it a good cleaning and got it a new set of tires.

Cleaned up and reassembled

 

c300 wheelchair base after extensive cleaning

 

 

Dodo puppet design

Rough mock-up of the Dodo’s overall shape