Reference: https://www.instructables.com/id/Arduino-Led-Dice...

I have added two more LEDs.

The Instructables will show you how to create a special digital dice that can roll out numbers one to nine by using Arduino. It is a simple project, and it is suitable for beginners and those who want to start with Arduino.

Step 1: Things You Need

Parts:

Arduino 9x LEDs of any kind

A 10k Resistor

9x 220 or 330 Resistor

A little Push Button

Breadboard

Some wires for the breadboard

Tools:

The Arduino programmer

Usb Cable A-B

Step 2: Place the LED on the Breadboard

Place LEDs in shape of 3x3 square. It is really difficult to find the right configuration without superimpose the LEDs. However, there is a facilitate picture that shows where should you place the short leg of LEDs(cathodes) and where should you place the long leg(anode). I group them into six groups. First group is upper left one and lower right one. Second group is middle right one and middle left one. Third group is upper right one and lower left one. Fourth group is the middle one. Fifth group is upper middle one. And the last group is lower middle one.