Make a Digital Dice using Arduino

Instruction:

1. User press a input switch to start the dice.
2. The dice displays 1-6 randomly (for 100 milliseconds) through a 7-segment display.
3. If user press the input switch again it will stop at the current random
   number and display the number
4. When input switch is pushed once again it will repeat the process from step 1 to 3.

Design:

Code:

/*
Name: Digital Dice
*/
int pin_2 = 2;
int pin_3 = 3;
int pin_4 = 4;
int pin_5 = 5;
int pin_6 = 6;
int pin_7 = 7;
int pin_8 = 8;
int pin_9 = 9;
int buttonPin = 1;
int buttonState;
int val;
int randNumber;
int cnt = 0;

void displayOne() {
   digitalWrite(pin_2, LOW);
   digitalWrite(pin_3, HIGH);
   digitalWrite(pin_4, HIGH);
   digitalWrite(pin_5, LOW);
   digitalWrite(pin_6, LOW);
   digitalWrite(pin_7, LOW);
   digitalWrite(pin_8, LOW);
}

void displayTwo() {
   digitalWrite(pin_2, HIGH);
   digitalWrite(pin_3, HIGH);
   digitalWrite(pin_4, LOW);
   digitalWrite(pin_5, HIGH);
   digitalWrite(pin_6, HIGH);
   digitalWrite(pin_7, LOW);
   digitalWrite(pin_8, HIGH);
}

void displayThree() {
   digitalWrite(pin_2, HIGH);
   digitalWrite(pin_3, HIGH);
   digitalWrite(pin_4, HIGH);
   digitalWrite(pin_5, HIGH);
   digitalWrite(pin_6, LOW);
   digitalWrite(pin_7, LOW);
   digitalWrite(pin_8, HIGH);  
}

void displayFour() {
   digitalWrite(pin_2, LOW);
   digitalWrite(pin_3, HIGH);
   digitalWrite(pin_4, HIGH);
   digitalWrite(pin_5, LOW);
   digitalWrite(pin_6, LOW);
   digitalWrite(pin_7, HIGH);
   digitalWrite(pin_8, HIGH);
}

void displayFive() {
   digitalWrite(pin_2, HIGH);
   digitalWrite(pin_3, LOW);
   digitalWrite(pin_4, HIGH);
   digitalWrite(pin_5, HIGH);
   digitalWrite(pin_6, LOW);
   digitalWrite(pin_7, HIGH);
   digitalWrite(pin_8, HIGH);
}

void displaySix() {
   digitalWrite(pin_2, HIGH);
   digitalWrite(pin_3, LOW);
   digitalWrite(pin_4, HIGH);
   digitalWrite(pin_5, HIGH);
   digitalWrite(pin_6, HIGH);
   digitalWrite(pin_7, HIGH);
   digitalWrite(pin_8, HIGH);
}

void setup() {            
    pinMode(buttonPin, INPUT);   
    pinMode(pin_2, OUTPUT); 
    pinMode(pin_3, OUTPUT);
    pinMode(pin_4, OUTPUT);
    pinMode(pin_5, OUTPUT);
    pinMode(pin_6, OUTPUT);
    pinMode(pin_7, OUTPUT);
    pinMode(pin_8, OUTPUT);
    pinMode(pin_9, OUTPUT);
    digitalWrite(9, 0);  // start with the "dot" off
    Serial.begin(9600);
    randomSeed(analogRead(0));
}

void randomVisit() { 
    randNumber = random(1, 7);
    switch(randNumber) {
        case 1:
           displayOne();
           break; 
        case 2:
           displayTwo();
           break;
        case 3:
           displayThree();
           break; 
        case 4:
           displayFour();
           break;
        case 5:
           displayFive();
           break; 
        case 6:
           displaySix();
           break;      
    }
    delay(100);
}

void loop() {
    val = digitalRead(buttonPin);
    if(cnt % 2 == 1) {
        randomVisit(); 
    }
    if(val != buttonState) {
        if(val == HIGH) {
            cnt++;
            if(cnt % 2 == 1) {
                randomVisit(); 
            }
        } 
    }
    buttonState = val;
}