Dangerous Prototypes

[align=center:]Dangerous Prototypes TTL Logic Contest
“Electronic “Kvetch-A-Sketch with 32-Page Flip Pad”
Submitted by Eastern Star Geek, Johnson City, Tennessee USA[/align:]

This project is an electronic interpretation of the famous Ohio Arts “Etch-A-Sketch” toy, with a twist.  Like the original, two rotary knobs are used to move a cursor horizontally and vertically, respectively, but unlike the original, a third knob selects one of 32 different sketch pages.  Simple flip-pad animations can therefore be created by twirling the page knob rapidly. 

The screen is built from four 8x8 dual-color LED matrix displays, for a total screen area of 16x16 pixels.  The artist has a palette of three colors from which to choose- Red, Green and Yellow. 

The three rotary knobs are quadrature encoders with a built-in pushbutton.

Several toggle switches and pushbuttons give the artist the ability to:
1.    Draw dots, either continuously, or one at a time, using the built-in pushbutton in the X knob.
2.    Erase dots, either continuously, or one at a time, using the built-in pushbutton in the Y knob.
3.    Choose the color of the dot(s) to be drawn or erased
4.    Choose between Edit and Playback modes (Cursor is turned off in Playback)
5.    Clear the current page
6.    Go to the “Home Page” using the built-in pushbutton in the Page knob.

This project is from an original idea by the author, and was designed and created from whole cloth especially for this contest.

For more information, visit my blog!
http://easternstargeek.blogspot.com (http://easternstargeek.blogspot.com)

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