Summary

Arduino powered Etch A Sketch with joystick controller and SD card storage. Arduino source included in EtchArtDuino.zip file.

Instructions

Sorry not a lot of build details here. I just built as I went with parts I had on hand in order to play with the steppers. It's one of my first OpenSCAD and Arduino projects so the code is, what it is. Don't judge it too harshly.

The menu system is pretty basic but it allows you to create and save a new drawing and redraw or delete an existing drawing.

Joystick Menu usage:  Up/Down         Moves cursor  Left            Back/Cancel  Right or Press  Select

Joystick Drawing usage is as you would expect:up, down, left, right. Press the joystick to end the drawing. It will ask if you are done, select yes to save and exit the drawing or select no to continue drawing.

Since the Etch ArtDuino has no way of knowing where the drawing stylus is at the beginning of a drawing, the display will ask you to choose a starting position (upper left or right, lower left or right, or the center) and then ask you to move the stylus there then press the joystick. It will save the starting position as the first byte of the file so it can prompt you to move the stylus to the correct position when redrawing the file.

Drawings are stored on a SD card using the Arduino SD library. You can cheat and create the files on a computer. The files must have an ".eas" extension and be in the root directory.

The file format is:  1st byte is binary and contains the suggested starting position       1: Upper Left      2: Upper Right      3: Lower Left      4: Lower Right      5: Center  The rest of the file is a string of single character   drawing commands      u: move up      d: move down      l: move left      r: move right  An example of a tiny 3x3 box would be:  (binary value of 1,2,3,4 or 5)rrrdddllluuu

Arduino Mini Pro Pin Wiring chart:

VCC +5V Supply  GND Ground  D2  Horiz/Left Stepper IN1  X-axis  D3  Horiz/Left Stepper IN2  D4  Horiz/Left Stepper IN3  D5  Horiz/Left Stepper IN4  D6  Vert/Right Stepper IN1 Y-axis  D7  Vert/Right Stepper IN2  D8  Vert/Right Stepper IN3  D9  Vert/Right Stepper IN4  D10 SPI SS SD Card  D11 SPI MOSI SD Card  D12 SPI MISO SD Card  D13 SPI SCK SD Card  A0  Joystick VX  A1  Joystick VY  A2  Joystick Button  A4  I2C SDA     OLED  A5  I2C SCL     OLED

Parts List:

1 ea    3D Printed EtchArtDuino.stl  1 ea    3D Printed gears.stl  1 ea    3D Printed joystick.stl  1 ea     Pocket Etch A Sketch  2 ea     28BYJ-48 5V DC 4-Phase 5-Wire + ULN2003 Driver           Board (ebay/amazon)  1 ea    Catalex microsd card adapter (ebay/electrodragon/amazon)  1 ea    Parallax.com Circuit Overlay Board (Part #32999)      1 ea    Arduino Pro Mini 328 - 5V/16MHz (sparkfun)  1 ea    0.96" I2C 128X64 OLED (ebay/electrodragon/amazon)  1 ea    PS2 Joystick Module marked "Keyes_SJoys" (ebay/electrodragon/amazon)  Miscellaneous 2mm screws and nuts.  Miscellaneous header wires.  5v Power supply and mating connector.

Additional SCAD Sources (included):

Parkinbot's Excellent Gear Library http://www.thingiverse.com/thing:636119

Additional Arduino Libraries:

SSD1306Ascii https://github.com/greiman/SSD1306Ascii
Bounce2 https://github.com/thomasfredericks/Bounce2