Picture This

Table of Contents

1. Overview
2. Instructions
3. UserStories
4. Specifications
5. Diagrams

Overview

Description

A net 64x64 RGB LED matrix is mounted on the wall at roughly child-height (TBD). LEDs can be lit or dimmed using a cursor controlled by a joystick. The cursor can cycle between three sizes depending on user preference. Eight different colors can be chosen for each led (including off). A user can turn off all LEDs on the board using a single button.

Instructions

1. Use the joystick to move the pen.
2. Set the color with one of the 8 available color buttons.
3. Change the pen size with the pen button.
4. Clear the screen with the reset button.
5. Start or stop drawing with the draw button
   • If the cursor is dim and blinking, drawing is off
   • If the cursor is bright and solid, drawing is on

UserStories

Required User Stories

Designer can select one or more LEDs using the joystick

• Reason: The joystick allows the designer to create designs. If they couldn't use the joystick to select an LED, they would have no way of interacting with the display.

Designer can set the size of the cursor using a button

• Reason: Given the number of LEDs on the display, it might be tedious to light one LED at a time. Allowing the designer to select more than one LED simultaneously fosters a positive experience.

Designer can select/change LED color (including off)

• Reason: This is a multi-color display. Designers will want to use more than one color or turn off an LED depending on the desired design

Designer can see which LED is selected

• Reason: The designer needs to know which LED they are currently drawing on or setting the color for

Designed can erase the entire display at once

• Reason: Turning off each LED individually is tedious. An instant clean start is desirable in some scenarios

Optional User Stories

Designer can play a game on the matrix

• Reason: This accepts a wider audience- instead of pure design, the display becomes interactive.

Specifications

Inputs

Physical joystick input [x1]

• Used to control LED cursor
• 4 GPIO pins
• 1 power pin

Color Buttons [x8]

• Used to set the color of the LEDs under the cursor
• White, Red, Green, Blue, Yellow, Orange, Purple, Clear

Reset button [x1]

• Sets all LEDs on the display to clear (off)

Cursor size button [x1]

• Cycles between 3 available cursor sizes

Draw button [x1]

• Toggles drawing on or off

Outputs

64x64 LED Matrix

• Individual LEDs able to light up, multiple at a time
• Each LED can have one of 8 colors (including off)

Collection of blinking LEDs to show cursor

• The designer will use the cursor to set LEDs on the matrix

Constraints

• Designer should not have access to internal wiring

  • This could damage the module and/or harm the designer

• Designer should not have direct access to the LED matrix

  • This could damage the matrix and/or harm the designer

• All parts of module should be durable and resistant to tampering and/or misuse

Diagrams

Block Diagram