const int REDpin = 3;
const int GREENpin = 4;
const unsigned long REDonDuration = 1000;    // OFF time for RED led
const unsigned long REDoffDuration = 250;    // ON time for RED led
bool REDState =HIGH;              // initial state of RED led
const unsigned long GREENonDuration = 325;    // OFF time for RED led
const unsigned long GREENoffDuration = 950;    // ON time for RED led
bool GREENState =HIGH;              // initial state of RED led

unsigned long REDpm=0;            //  RED led previous millis

void setup() {
  pinMode(REDpin,OUTPUT);         // define REDpin as output
  digitalWrite(REDpin,REDState);  // set initial RED state
  pinMode(GREENpin,OUTPUT);         // define REDpin as output
  digitalWrite(GREENpin,GREENState);  // set initial RED state
}

void loop() {

 if( REDState == HIGH)
 {
    if( (millis()- REDpm) >= REDonDuration)
    {   
      REDState = LOW;              // change the state of RED led
      REDpm=millis();             // remember current RED millis() time
    }
 }
 else
 {   
    if( (millis()- REDpm) >= REDoffDuration){     
     REDState =HIGH;              // change the state of RED led
      REDpm=millis();             // remember current RED millis() time

    }
 }

 digitalWrite(REDpin,REDState);   // command RED led
 digitalWrite(GREENpin,GREENState);   // command RED led

}