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

const int TRIG = 27;
const int ECHO = 14;

float distance;
long duration;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

WiFiClient client;

unsigned long CHANNEL_ID = 2892975;

const char* WRITE_API_KEY = "WPCUEF4JVG8OKIC9";

int status;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(TRIG, OUTPUT);
  pinMode(ECHO,INPUT);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

}
void getWifi(){
  if(WiFi.status()!=WL_CONNECTED){
    Serial.println("Atempting to connect");
    while(WiFi.status()!=WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      Serial.println(".");
      delay(10000);
    }
    Serial.println("connected");
  };
}

void loop() {
  getWifi();

  digitalWrite(TRIG,LOW);
  delayMicroseconds(10);
  digitalWrite(TRIG, HIGH);
  duration = pulseIn(ECHO,HIGH);
  distance = 0.017*duration;

  Serial.println("distance : " + String(distance));
  Serial.println("---------------------");


  ThingSpeak.setField(1,distance);

  status = ThingSpeak.writeFields(CHANNEL_ID,WRITE_API_KEY);

  if(status == 200){
    Serial.println("Channel updated succesfully");
  }
  else{
    Serial.println("Problem with writing data , HTTP errror code : " + String(status));
  }
  delay(15000);
}