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

const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2496893;
const char* myApiKey = "OAE7KDGBY2D8BVVW";
const char* server = "api.thingspeak.com";

const int trig = 18;
const int echo = 5;
long duration;
long distance;

WiFiClient client;

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected");
  }
  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  duration = pulseIn(echo, HIGH);
  distance = duration*0.034/200;

  ThingSpeak.setField(1, distance);
  int x = ThingSpeak.writeFields(myChannelNumber,myApiKey);

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

  delay(10000);
}