Untitled

int redLED = D5;
int yellowLED = D6;
int greenLED = D7;
int speaker = D8;

void setup() {
  // put your setup code here, to run once:
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(speaker, OUTPUT);
}

void loop() {
  // Red light for 30 seconds
  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, LOW);
  noTone(speaker); // turn off the speaker
  delay(30000); // 30 seconds
  
  // Yellow light for 5 seconds
  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, LOW);
  noTone(speaker); // turn off the speaker
  delay(5000); // 5 seconds
  
  // Green light for 30 seconds
  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, HIGH);
  tone(speaker, 1000); // play a sound on the speaker
  delay(30000); // 30 seconds
}