#define red 6
#define green 5
#define blue 3
#define button 2

int mode=0;

void setup() {

pinMode(button, INPUT_PULLUP);
pinMode(blue, OUTPUT);
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);

}

void loop() {

if (digitalRead(button)==LOW) {
  mode=mode+1;
  delay(200);
}

if (mode==0) {
  analogWrite(red, 0);
  analogWrite(green, 0);
  analogWrite(blue, 0);
}

if (mode==1) {
  analogWrite(red, 255);
  analogWrite(green, 0);
  analogWrite(blue, 0);
}

if (mode==2) {
  analogWrite(red, 0);
  analogWrite(green, 255);
  analogWrite(blue, 0);
}

if (mode==3) {
  analogWrite(red, 0);
  analogWrite(green, 0);
  analogWrite(blue, 255);
}

if (mode==4) {
  analogWrite(red, 255);
  analogWrite(green, 255);
  analogWrite(blue, 0);
}

if (mode==5) {
  analogWrite(red, 255);
  analogWrite(green, 0);
  analogWrite(blue, 255);
}

if (mode==6) {
  analogWrite(red, 0);
  analogWrite(green, 255);
  analogWrite(blue, 255);
}

if (mode==7) {
  analogWrite(red, 255);
  analogWrite(green, 255);
  analogWrite(blue, 255);
}

if (mode==8) {
  mode=0;
}

}