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 Bean Cutter

This is a semi-automatic bean cutter.  It uses a real knife and is semi-automatic to control speed and move beans as they get cut.  A tilt sensor is used which is connected to the motor and a knife is attached to the motor.  Very simple programming of tilt sensor is done.  A wheel is attached to the tilt sensor to tilt it backwards and forwards.


YouTube Video


  1. bbratzel

    What a clever use of the tilt sensor! I’d be a little worried about my fingers, though–that knife looks sharp!

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