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

Halloween bot

This Halloween bot is a perfect companion for your halloween evening.  It senses a person or even a dog coming and turns around, asks them "Trick or Treat" but also offers a piece of candy for either of them.  It uses Ultrasound sensors to detect the object in front.  I also recorded my own voice and added them into the bot.




  1. bbratzel

    I wish the trick or treaters that came to my house brought ME candy. What a generous bot you built. I love its scary voice!

  2. simpson

    Your voice saying “please, take some candy” was so scary tha I suppose if sb came on Halloween to your house wolud be afraid of it 🙂 Did you use it on Halloween? I could be a surprise.

Leave a Reply