//Car Park with Buzzer
#define TRIG 3
#define ECHO 2
#define R 9
#define G 10
#define B 11
#define BUZZER 8
long dur;
int dist;

void setup() {
  Serial.begin(115200);
  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);
  pinMode(R, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(BUZZER, OUTPUT);
}

void loop() {
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);

  dur = pulseIn(ECHO, HIGH);
  dist = dur * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.println(dist);

  if (dist <= 100) {
    setColor(0, 255, 255); // Cyan
    digitalWrite(BUZZER, HIGH); // Continuous beep
  } else if (dist > 100 && dist <= 200) {
    setColor(255, 255, 0); // Yellow
    digitalWrite(BUZZER, HIGH); // Intermittent beep
    delay(100);
    digitalWrite(BUZZER, LOW);
    delay(100);
  } else {
    setColor(255, 0, 255); // Magenta
    digitalWrite(BUZZER, LOW); // No beep
  }
  delay(1000);
}

void setColor(int rVal, int gVal, int bVal) {
  analogWrite(R, rVal);
  analogWrite(G, gVal);
  analogWrite(B, bVal);
}