#define button 4
#define redLED 5
#define greenLED 6
#define blueLED 7
int state = 0;
int old = 0;
int buttonPoll = 0;

void setup() {
 pinMode(button,INPUT);
  //RGB LED set as output
   pinMode(redLED,OUTPUT);
    pinMode(greenLED,OUTPUT);
     pinMode(blueLED,OUTPUT);

      digitalWrite(redLED,LOW);
       digitalWrite(greenLED,LOW);
        digitalWrite(blueLED,LOW);
        }

        void loop() {
         buttonPoll = digitalRead(button);
          if(buttonPoll == 1) {
           delay(50);
            buttonPoll = digitalRead(button);
             if(buttonPoll == 0) {
              state = old + 1;
               }
                }
                 else {
                  delay(100);
                  }

                  switch (state) {
                   case 1: //Red color
                    digitalWrite(redLED,HIGH);
                     digitalWrite(greenLED,LOW);
                      digitalWrite(blueLED,LOW);
                       old = state;
                        break;
                         case 2: //Green color
                          digitalWrite(redLED,LOW);
                           digitalWrite(greenLED,HIGH);
                            digitalWrite(blueLED,LOW);
                             old = state;
                              break;
                               case 3: //Blue color
                                digitalWrite(redLED,LOW);
                                 digitalWrite(greenLED,LOW);
                                  digitalWrite(blueLED,HIGH);
                                   old = state; 
                                    break;
                                     case 4:
                                      digitalWrite(redLED,HIGH);
                                       digitalWrite(greenLED,LOW);
                                        digitalWrite(blueLED,HIGH);
                                         old = state; 
                                          break;
                                           case 5: 
                                            digitalWrite(redLED,HIGH);
                                             digitalWrite(greenLED,HIGH);
                                              digitalWrite(blueLED,LOW);
                                               old = state; 
                                                break;
                                                 case 6:
                                                  digitalWrite(redLED, LOW);
                                                   digitalWrite(greenLED, HIGH);
                                                    digitalWrite(blueLED, HIGH);
                                                    old = state;
                                                    break;
                                                     case 7:
                                                      digitalWrite(redLED, HIGH);
                                                       digitalWrite(greenLED, HIGH);
                                                        digitalWrite(blueLED, HIGH);
                                                        old = state;
                                                        break;
                                                         default:
                                                          digitalWrite(redLED,LOW);
                                                           digitalWrite(greenLED,LOW);
                                                            digitalWrite(blueLED,LOW);
                                                            old = 0;
                                                            break;
                                                           }
                                                            }