#include <WiFi.h>
#include "ThingSpeak.h"

const char* ssid = "Wokwi-GUEST";
const char* password = "";

// ThingSpeak channel details
unsigned long  myChannelNumber =   3045102;
const char* WriteAPIKey = "83Q99SYMY95HI7EF";


WiFiClient client;

const char* SSID = "Wokwi-GUEST";     // For simulation
const char* PASSWORD = "";            // No password needed for Wokwi-GUEST


// Ultrasonic Sensor
const int trigPin = 17;
const int echoPin = 16;

// Variables
long duration;
float distanceCM;

void setup() {
  Serial.begin(115200);

// Start wifi - 2 parameter (ssid, password)
   WiFi.begin(ssid, password);
   Serial.println("Connecting to Wifi.....");

   //Coonect ESP32 & Wifi
   while(WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print(".");
   }
   // Connection Info
   Serial.println("");
   Serial.println(" WiFi Connected!");
   Serial.print("IP Address: ");
   Serial.println(WiFi.localIP());

  // Initialize ThingSpeak client
  ThingSpeak.begin(client);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

}

void loop() {

  // Read distance
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distanceCM = duration * 0.034 / 2;

  // Display on Serial
  Serial.print("Distance: ");
  Serial.print(distanceCM);
  Serial.println(" cm");

  // Send to ThingSpeak
  ThingSpeak.setField(1, distanceCM);
  
   //Write to ThingSpeak
  //2 parameters 1. channel #, 2. WAPIKey

  int x = ThingSpeak.writeFields(myChannelNumber, WriteAPIKey);



  if (x == 200) {
    Serial.println("Data pushed successfully");
  } else {
    Serial.println("Push error: " + String(x));
  }
  Serial.println("---");
  
  delay(15000);
  
}