/*
  LED Demo program to illustrate the use of use of switches as
  input devices to control the of/off state and sequence of LEDs.

  Pins 9, 10, 11, and 12 are used as button (switch) inputs.
  Pins 0 through 7 are output pins connected to LEDs as
  indicators.
  
  Please see Lab Work Sheet for Trainer Board set and wiring
  connections.
*/

// the number of the pushbutton pin 
const int buttonPin1 = 12;     
const int buttonPin2 = 11;     
const int buttonPin3 = 10;     
const int buttonPin4 = 9;       

// the number of the LED pin
const int ledPin0 =  0;
const int ledPin1 =  1;
const int ledPin2 =  2;
const int ledPin3 =  3;
const int ledPin4 =  4;
const int ledPin5 =  5;    
const int ledPin6 =  6;
const int ledPin7 =  7;

// variables will change:
// variable for reading the pushbutton status
int buttonState1 = 0;         
int buttonState2 = 0;
int buttonState3 = 0;
int buttonState4 = 0;

//delay between blinks
int time = 50;

void setup()
{
    // initialize the LED pin as an output:
    pinMode(ledPin0, OUTPUT);
    pinMode(ledPin1, OUTPUT);
    pinMode(ledPin2, OUTPUT);
    pinMode(ledPin3, OUTPUT);
    pinMode(ledPin4, OUTPUT);
    pinMode(ledPin5, OUTPUT);
    pinMode(ledPin6, OUTPUT);
    pinMode(ledPin7, OUTPUT);

    // initialize the pushbutton pin as an input:
    pinMode(buttonPin1, INPUT);
    pinMode(buttonPin2, INPUT);
    pinMode(buttonPin3, INPUT);
    pinMode(buttonPin4, INPUT);

}

void loop()
{
    // read the state of the pushbutton value:
    buttonState1 = digitalRead(buttonPin1);
    buttonState2 = digitalRead(buttonPin2);
    buttonState3 = digitalRead(buttonPin3);
    buttonState4 = digitalRead(buttonPin4);

    //change the delay according to button 3
    if (buttonState4 == HIGH) //read high
    {
        time =50; //speed up blink
    }
    else
    {
        time = 200; // slow down blink
    }

    //Create an illusion of flowing LEDs - flow led code 
    //turn off this led and turn on led, then it looks like the light is flowing 
    if(buttonState1 == HIGH)
    {
        digitalWrite(ledPin7, LOW);
        digitalWrite(ledPin0, HIGH);
        delay(time);
        digitalWrite(ledPin0, LOW);
        digitalWrite(ledPin1, HIGH);
        delay(time);
        digitalWrite(ledPin1, LOW);
        digitalWrite(ledPin2, HIGH);
        delay(time);
        digitalWrite(ledPin2, LOW);
        digitalWrite(ledPin3, HIGH);
        delay(time);
        digitalWrite(ledPin3, LOW);
        digitalWrite(ledPin4, HIGH);
        delay(time);
        digitalWrite(ledPin4, LOW);
        digitalWrite(ledPin5, HIGH);
        delay(time);
        digitalWrite(ledPin5, LOW);
        digitalWrite(ledPin6, HIGH);
        delay(time);
        digitalWrite(ledPin6, LOW);
        digitalWrite(ledPin7, HIGH);
        delay(time);

    }
    else
    {
        if (buttonState2 == HIGH) // if read switch 2 high
        {
            // all led blink
            digitalWrite(ledPin7, LOW);
            digitalWrite(ledPin6, LOW);
            digitalWrite(ledPin5, LOW);
            digitalWrite(ledPin4, LOW);
            digitalWrite(ledPin3, LOW);
            digitalWrite(ledPin2, LOW);
            digitalWrite(ledPin1, LOW);
            digitalWrite(ledPin0, LOW);
            delay(time);
            digitalWrite(ledPin7, HIGH);
            digitalWrite(ledPin6, HIGH);
            digitalWrite(ledPin5, HIGH);
            digitalWrite(ledPin4, HIGH);
            digitalWrite(ledPin3, HIGH);
            digitalWrite(ledPin2, HIGH);
            digitalWrite(ledPin1, HIGH);
            digitalWrite(ledPin0, HIGH);
            delay(time);

        }
        else// if read switch 2 low
        {
            if (buttonState3 == HIGH)// if read switch 3 high
            {
                //LED blink every other one
                digitalWrite(ledPin7, HIGH);
                digitalWrite(ledPin6, LOW);
                digitalWrite(ledPin5, HIGH);
                digitalWrite(ledPin4, LOW);
                digitalWrite(ledPin3, HIGH);
                digitalWrite(ledPin2, LOW);
                digitalWrite(ledPin1, HIGH);
                digitalWrite(ledPin0, LOW);
                delay(time);
                digitalWrite(ledPin7, LOW);
                digitalWrite(ledPin6, HIGH);
                digitalWrite(ledPin5, LOW);
                digitalWrite(ledPin4, HIGH);
                digitalWrite(ledPin3, LOW);
                digitalWrite(ledPin2, HIGH);
                digitalWrite(ledPin1, LOW);
                digitalWrite(ledPin0, HIGH);
                delay(time);

            }
            else// if read switch 3 low
            {
                // turn off all led 
                digitalWrite(ledPin7, LOW);
                digitalWrite(ledPin6, LOW);
                digitalWrite(ledPin5, LOW);
                digitalWrite(ledPin4, LOW);
                digitalWrite(ledPin3, LOW);
                digitalWrite(ledPin2, LOW);
                digitalWrite(ledPin1, LOW);
                digitalWrite(ledPin0, LOW);
            }

        }

    }

}