Tag Archives: Cookie Bot

Maker Faire Recap

Maker Faire was amazing and exhausting at the same time. We worked at our booth in the Expo Hall the whole day, and ended up handing out more than 3,000 business cards for the D.Bug Model Kits!! Lots of people loved the D.Bugs and some even wanted to buy the apron (if you are one of them, contact us!). Here are some pictures from both days.

6:30 AM arrival on the first day. Got a great parking spot, woohoo!


Here’s our booth before the crowd arrived in the morning.

Sean and Melisa pose with the robot masks!

We demonstrated how the Cookie Bot works.


MF2      MF3

Photo Bot was also a big hit! “4…3…2…1…Excellent!”


We even received Maker Faire Editor’s Choice award!


Stayed tuned for a post on the most amusing Photo Bot pictures.




Mounting stepper motors

Cookie Bot is about half way complete. Mounting the stepper motors was non-trivial. The motors are temporarily mounted into the chassis. We didn’t know stepper motors could get hot enough to melt Legos! Heat sinks had to be added as a precautionary measure.

Cookie Bot

We built a box around the main drive motor that may be insanely over engineered…



We weren’t satisfied with the DC motors – there’s too much gear chatter, not enough torque, and no precision control. So, we upgraded to stepper motors. We built the stepper driver circuit with a current feedback loop, but the H-bridges were overheating. We finally decided to go with an off the shelf solution and bought some stepper driver boards. We will need to make a new prototype to fit the stepper motors on the chassis.

Cookie Bot Proto 1

We have completed several stages of the Cookie Bot Proto 1. In the first iteration, Corinna built a car to ride along a pair of rails built by Melisa. Donald built a mini car to ride across a the car on a middle rail. The second iteration revised Corinna’s car. Gears and actuators were added to the car, and the mini car was built into the prototype. Sophie and Corinna worked on adding a differential gear system to drive the car. This requires the right and left sides of the car to be symmetric.