Enchanted Witches Hat

Description

When my daughter was a witch for Halloween, she wanted her costume to stand out a little from the other witches out there. To do this, we added a little magic to her costume by attaching Adafruit Sewable NeoPixels to her cloak for lighting effects and added a little animation to her hat using a cheap Towerpro SG90 servo. Between the two enhancements, it was the hat that received the most amount of comments, so I wanted to share it as a quick and easy enhancement to your childs Halloween costume.

Build Instructions

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1

Extend the servo horn

In order to get the amount of throw needed to wiggle the hat, I needed to extend the length of the servo horn. I did this by quickly molding some thermal-morph plastic to the horn. You'll see that as the very roughly formed red extension attached to the horn in the pictures below.
2

Create the servo harness

To attach the servo to the hat, I cut a small strip of plastic canvas, which is available at any craft store.

Then I cut a rectangular hole for the servo and held it in place with a little hot glue.

Finally, on each end of the plastic canvas, I attached a strip of self-adhesive Velcro. The other half of the Velcro was attached inside the hat. (pictured below)
3

Attach the servo harness to the hat

I attached the servo harness by turning the hat inside-out and adhering the self-adhesive Velcro strips about 2/3rds the way up the hat. Then I attach the horn of the servo to the hat using a safety pin.