Color selector for Lego World 2016

All years, we use a color selector device (we call it the PUI, the Physical User Interface) as the starting point of our track. Over the past years, the PUI looked like this:

PUI 2012 - 2015

A short description of the color selectors of the past:

  • 2012: Just four simple buttons (the spring mechanism of the touch sensor pushed the button back to its released state)
  • 2013: More advanced buttons with motors that pushed the buttons back to its release state
  • 2014: Shooters to hit the desired color
  • 2015: A ticket reader to read your drawn card that started the train to collect the candy with ‘track and trace’ functionality

For Lego World 2016, we came up with the idea of a color selector that is based on the wheel of fortune. A fortune wheel is divided in segments by pins. You spin the wheel, the pointer that is mounted on a flexible device rubs against the pins to impart friction and slow the wheel down until it stops. The winning segment is indicated by the pointer. An example of a wheel of fortune:

Wheeloffortune

The Lego version looks like follows (picture made in LDD):

Sioux.NET on Track - Color Selector

I currently don’t have enough bricks to finish building the object, but the current state gives already a good view how it will look:

Color Selector for Lego World 2016, work in progress Color Selector for Lego World 2016, work in progress

And the video that belongs to this current state:


The lever mechanism is based on the “free wheel” mechanism of electricBricks (see an example here). Because the mechanism based on the turntable (50163) was not robust enough, I improved the mechanism as folllows:

Improved free wheel mechanism

The principle however remains the same: by pulling the lever, the red angle element grabs the tooth of the gear making the axle turn. The axle is connected to the wheel, making it spin. The other way around: when the axle turns, it doesn’t grab the angle element so you can return the lever to its original position without any problem. To improve the friction between the angle element and the gear, I use a v-belt:

Detail of swing mechanism

The missing pieces are now in back order, when I receive them and I finish building I will update this post.

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