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

//Name of router and password
const char* ssid="Wokwi-GUEST";
const char* password="";
const int trigPin = 12;
const int echoPin = 14;

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
int distanceCm;
int distanceInch;

//thingSpeak setting
unsigned long channelNumber = 2592051;
const char* WriteAPIKey = "TJ13N5LENPBXWW3F";

WiFiClient client;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); 
  WiFi.begin(ssid,password);
  Serial.println("connecting to wifi.......");
  //conect divice wifi
  while (WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print(".");
  } 
   
  Serial.println("");
  Serial.println("connected");
  Serial.print("WiFi Address: ");
  Serial.println(WiFi.localIP());

  ThingSpeak.begin(client);
  
}

void loop() {
   // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  
  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  
  ThingSpeak.setField(1, distanceCm);
  int x = ThingSpeak.writeFields(channelNumber, WriteAPIKey);
  
  if (x == 200){
    Serial.println("Success");
  }else{
    Serial.println("Failed:"+ String(x));
  }
  delay(1000);
  
}