SimpleIntervalTimer.ino

#define redP 2
#define greenP 0
#define blueP 1
#define toneP 3

void setup() {
  // put your setup code here, to run once:
  pinMode(redP, OUTPUT);
  pinMode(greenP, OUTPUT);
  pinMode(blueP, OUTPUT);
  digitalWrite(redP, LOW);
  digitalWrite(greenP, LOW);
  digitalWrite(blueP, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  shortTone(500);
  shortTone(1000);
  
  digitalWrite(blueP, HIGH);
  delay(1500000);
  digitalWrite(blueP, LOW);

  shortTone(1000);
  shortTone(500);
  
  digitalWrite(greenP, HIGH);
  delay(300000
  
  );
  digitalWrite(greenP, LOW);
  
}

void shortTone(int freq){
  tone(toneP, freq);
  delay(100);
  noTone(toneP);
  delay(100);
}