Sadly, Dr. E’s WeDo Challenges and Dr. E’s MINDSTORMS Challenges will no longer be posting new challenges. However, both websites will remain up so that you can continue to access the previous challenges and all of the wonderful submissions. Thank you to LEGO Education and to the Center for Engineering Education and Outreach at Tufts University for their years of support (and thank you to LEGO for their amazing robotics platforms). During the six years of WeDo challlenges and five years of MINDSTORMS challenges, we received almost 1000 submissions from around the world. The two websites had a total of 1266 registered users from 57 different countries. We were truly a global community! We have always been inspired and energized by the creativity and innovation shown by the Dr. E's Challenges community; while new challenges won't be posted moving forward, we hope that you continue doing awesome stuff in your homes, clubs, and classrooms and that you continue to share your projects with the world! Collaborating with all of you has been a joy and an inspiration. Thank you, The folks at Dr. E’s

Sharko’s cotton catapult

The Knights are at the castle door and they want to get in and take over.  But they need some help to get the door down.  Here comes their new invention, a Cotton Ball Launcher!!!... See how it can break down a whole Castle door!!!
Two motors and separate programming for each motor is used in this.  One to launch the cotton ball launcher and another to bring down the wall when the cotton ball hits it.  The launcher flings the cotton ball and comes back to original position and a knight's helper stands by to load it again.. 
YouTube Link
Note about voting:
Manu was voted the February fan favorite, so he is not eligible for this month's fan favorite voting. However, you can still leave comments for him. Also, check out the Fan Favorite Forum, where Manu answers questions from other WeDoers.


    • Manu

      The cotton ball doesn’t actually knock down the wall. I put a motor on the other side of the wall . A long brick connects the motor to the base. The wall is resting on the base. I timed the motor turning on such a way that when the cotton ball launches, the motor starts running which moves the long brick. The long brick moves the base which knocks down the wall. It looks like the cotton ball knocked down the wall. Thank you for commenting.

  1. pbdclass

    Great job Sharko. I cant believe it knocked down the wall. I can see you put a lot of work in to this. Keep it up

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