#define LED1 11
#define LED2  9

unsigned long ms_from_start =0;
unsigned long ms_previous_read_LED1  = 0;
unsigned long LED1_interval=1000;
unsigned long ms_previous_read_LED2  = 0;
unsigned long LED2_interval=250;

int LED1_state=0;
int LED2_state=0;


void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
  ms_from_start  = millis();

 if (ms_from_start-ms_previous_read_LED1> LED1_interval){
    ms_previous_read_LED1=ms_from_start;
    if (LED1_state==0) LED1_state=1;  else LED1_state=0;
    digitalWrite(LED1,LED1_state);
  }

  if (ms_from_start-ms_previous_read_LED2>  LED2_interval){
    ms_previous_read_LED2=ms_from_start;
    if (LED2_state==0)  LED2_state=1; else LED2_state=0;
    digitalWrite(LED2,LED2_state);
  }

}

/*
#define LED1 3
#define LED2 9
void setup() {
   pinMode(LED1,   OUTPUT);
   pinMode(LED2, OUTPUT);
}
void loop() {
  digitalWrite(LED1,   HIGH);
  digitalWrite(LED2, HIGH); 
  delay(100); 
  digitalWrite(LED2,   LOW);
  delay(100);
  digitalWrite(LED2, HIGH); 
  delay(100); 
  digitalWrite(LED2,   LOW);
  delay(100);
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);   
  delay(100); 
  digitalWrite(LED2, LOW);
  delay(100);
  digitalWrite(LED2,   HIGH); 
  delay(100); 
  digitalWrite(LED2, LOW);
  delay(100);
}
*/