#define LED1  3
#define LED2  2

#define LED_OFF 0
#define LED_ON  1

int state_led1 = LED_OFF;
long int counter1 = 0;
int state_led2 = LED_OFF;
long counter2 = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  switch(state_led1)
  {
    case LED_OFF: if(counter1++ == 500000)
                  {
                    digitalWrite(LED1, HIGH);
                    counter1 = 0;
                    state_led1 = LED_ON;
                  }
                  break;

    case LED_ON:  if(counter1++ == 500000)
                  {
                    digitalWrite(LED1, LOW);
                    counter1 = 0;
                    state_led1 = LED_OFF;
                  }
                  break;
  }

  switch(state_led2)
  {
    case LED_OFF: if(counter2++ == 100000)
                  {
                    digitalWrite(LED2, HIGH);
                    counter2 = 0;
                    state_led2 = LED_ON;
                  }
                  break;

    case LED_ON:  if(counter2++ == 100000)
                  {
                    digitalWrite(LED2, LOW);
                    counter2 = 0;
                    state_led2 = LED_OFF;
                  }
                  break;
  }
}