int pin=2;
int LEDR = 10; 
int LEDG=11;
int LEDB=12;

void setup() {
   pinMode(10, OUTPUT); 
   pinMode(11, OUTPUT); 
   pinMode(12, OUTPUT); 
     pinMode(2, INPUT); 
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(pin), blink,LOW);
   //interrupt at pin 2 blink ISR when pin to change to low
} 
void loop() { 
   digitalWrite(LEDR ,LOW); //pin 13 equal the state value
   digitalWrite(LEDG ,HIGH);
   delay(200);
   digitalWrite(LEDG ,LOW);
    delay(200);
   digitalWrite(LEDB ,HIGH);
    delay(200);
   digitalWrite(LEDB ,LOW);
   delay(200);
} 

void blink() { 
   digitalWrite(LEDR ,HIGH);
  

}