#include <ESP32Servo.h>
#include <NewPing.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

#define TRIGGER_PIN  4
#define ECHO_PIN     2
#define MAX_DISTANCE 400
#define SERVO_PIN    12
#define BUZZER_PIN   33

Servo servo;
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
int distance = 0;
int pos=0;
char auth[] = "IwUsSPWag3d47s9K__zrqRJIiAJliGjp";

BlynkTimer timer;

void setup() {
  Serial.begin(9600);
  servo.attach(SERVO_PIN, 500, 2500); // Specify servo pin and pulse width range
  servo.setPeriodHertz(50); // Set the servo PWM frequency (optional)
  pinMode(BUZZER_PIN, OUTPUT);
  Blynk.begin(auth, "Wokwi-GUEST", "");
  timer.setInterval(1000L, checkDistance);
}

void loop() {
  Blynk.run();
  timer.run();
}

void checkDistance() {
  distance = sonar.ping_cm();
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  Blynk.virtualWrite(V1, distance); // Update the distance on Gauge widget

  if (distance < 50) {
    servo.write(90);
    digitalWrite(BUZZER_PIN, HIGH);
    delay(5000);
    servo.write(0);
    digitalWrite(BUZZER_PIN, LOW);
  }
}

BLYNK_WRITE(V0) {
  int servoPosition = param.asInt();
  servo.write(servoPosition);
}