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PiProjector

An Architect's / Engineer's / Mathematician's / Scientist's favorite tool for cutting pies.

This project projects a laser that shows the user where to cut on a pie / cake at exact fractions. No more arguing about who's cut is bigger!

I already own a Logitech C920 webcam and had some money to spend from Christmas. I ultimately decided that getting a projector would be a fun purchase. For this project, the projector should not be too expensive, yet still be able to project at demands. The projector chosen has a native resolution of 720p and supports USB power and HDMI input, making it extremely portable.

Tools like this currently exist in the app store. However, these tools simply project a transparent image on top of a phone's camera output, meaning that the user would have to cut their pie / cake looking through the phone. This project uses lasers, which aided with a stand, can freely cut their dessert with both hands (and lasers are much cooler).

Current Equipment:

Features:

  • [CURRENT PROGRESS] Automatic Camera / Projection Calibration
    • Takes multiple images, uses image subtraction, and template matching to solve for center, skewness, and area of projection.
  • [CURRENT PROGRESS] Projection / Camera CAD mount
  • [PLANNED] Optical Flow tracking of pie
  • [PLANNED] Circle fraction projections
    • [FUTURE] Multiple fraction support
  • [PLANNED] Magnification Lens for Projector for close-up projection

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Thing that divides pies

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