const int trigPin = 12;
const int echoPin = 14;
const int buzzerPin = 15;
const int ledPin = 16; // LED in place of the vibration motor
void setup() {
Serial.begin(115200);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(buzzerPin, OUTPUT);
pinMode(ledPin, OUTPUT);
}
void loop() {
long distance = getDistance();
Serial.println("Distance: " + String(distance) + " cm");
if (distance < 50) {
Serial.println("Activating Buzzer and LED");
tone(buzzerPin, 2000, 1000); // Buzzer on
digitalWrite(ledPin, HIGH); // LED on
delay(1000);
noTone(buzzerPin); // Buzzer off
digitalWrite(ledPin, LOW); // LED off
}
delay(500);
}
long getDistance() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
return pulseIn(echoPin, HIGH) * 0.034 / 2;
}