unsigned long myTime;
unsigned long myTime2;

void setup() {

Serial.begin(9600);
Serial.println("BEGIN");
Serial.println();

}

void loop() {


if (millis() > myTime) {
  Serial.println("xxx");
  myTime = millis() + 2000;
}


if (millis() - myTime2 > 3000) {
  Serial.println("yyy");
  myTime2 = millis();
}


}