#define BLYNK_TEMPLATE_ID "TMPL63dRKf-UV"
#define BLYNK_TEMPLATE_NAME "Pet Feeder"
#define BLYNK_AUTH_TOKEN "P1baa8WyM-De5hoJH0bC9prd6HXHIct9"

// Include the Blynk ESP32 library
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <ESP32Servo.h>

Servo s;
int degree = 0;

// Blynk authorization token
char auth[] = BLYNK_AUTH_TOKEN;

// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Create a Blynk timer object
BlynkTimer timer;

// Ultrasonic sensor pins
#define trig 4
#define echo 2

long duration;
int distance;

WidgetLED led1(V3);

// Function to get sonar data
void sonardata() {
  digitalWrite(trig, LOW);   // Makes trigPin low
  delayMicroseconds(2);      // 2 microsecond delay

  digitalWrite(trig, HIGH);  // trigPin high
  delayMicroseconds(10);     // trigPin high for 10 microseconds
  digitalWrite(trig, LOW);   // trigPin low

  duration = pulseIn(echo, HIGH);   // Read echo pin, time in microseconds
  distance = duration * 0.034 / 2;  // Calculating actual/real distance

  Serial.print("Distance = ");      // Output distance on Arduino serial monitor
  Serial.println(distance);

  if (distance == 50) {
    Serial.println("Distance is 50 cm, turning LED on.");
    led1.on(); // Turn on the LED
  } else {
    led1.off(); // Turn off the LED if distance is not 50 cm
  }

  Blynk.virtualWrite(V3, distance);
}

// This function will be called every time a widget in the Blynk app writes to Virtual Pin 0
BLYNK_WRITE(V0) {
  int buttonState = param.asInt(); // Get the state of the button from the Blynk app
  if (buttonState == 1) {
    s.write(90); // Rotate the servo to 90 degrees
  } else {
    s.write(0); // Rotate the servo back to 0 degrees
  }
}

void setup() {
  // Begin serial communication at a baud rate of 115200
  Serial.begin(115200);
  Serial.println("Connecting to Blynk...");

  // Set up pin modes for the ultrasonic sensor
  pinMode(trig, OUTPUT);  // Sets the trigPin as an Output
  pinMode(echo, INPUT);   // Sets the echoPin as an Input

  // Initialize Blynk
  Blynk.begin(auth, ssid, pass);
  
  // Attach the servo to pin 21
  s.attach(21);

  // Set timer to call sonardata function every second
  timer.setInterval(1000L, sonardata);
}

void loop() {
  Blynk.run(); // Run Blynk
  timer.run(); // Run the timer
}