#include <ThingSpeak.h>
#include <WiFi.h>  // Use WiFi library for ESP32

//----------- Enter your Wi-Fi Details---------//
char ssid[] = "vivo Y31";  //SSID
char pass[] = "123456789"; //Password
//---------------------------------------------//

const int trigger = 6;  // You can use the same GPIO pins as long as they are valid for ESP32
const int echo = 5;
long T;
float distanceCM;
WiFiClient  client;

unsigned long myChannelField = 2665781; // Channel ID
const int ChannelField = 1; // Which To Field Write
const char * myWriteAPIKey = "ZVC41TCF1B402TXT"; // Write API Key

void setup()
{
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  WiFi.begin(ssid, pass);
  
  Serial.println("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  
  ThingSpeak.begin(client);  // Initialize ThingSpeak
}

void loop()
{
  if (WiFi.status() != WL_CONNECTED)
  {
    Serial.println("WiFi not connected, attempting to reconnect...");
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED)
    {
      delay(1000);
      Serial.print(".");
    }
    Serial.println("\nReconnected to WiFi.");
  }

  // Trigger the ultrasonic sensor
  digitalWrite(trigger, LOW);
  delay(1);
  digitalWrite(trigger, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigger, LOW);
  
  // Measure the pulse duration and calculate the distance
  T = pulseIn(echo, HIGH);
  distanceCM = T * 0.034 / 2;
  
  Serial.print("Distance in cm: ");
  Serial.println(distanceCM);
  
  // Write the data to ThingSpeak
  ThingSpeak.writeField(myChannelField, ChannelField, distanceCM, myWriteAPIKey);
  
  // Wait 15 seconds (ThingSpeak's minimum update rate is once every 15 seconds)
  delay(15000);
}