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

#define TRIG_PIN  4 
#define ECHO_PIN  2 
#define SERVO_PIN 26  
#define DISTANCE_THRESHOLD  250 
Servo servo; 


float duration_us, distance_cm;
float duration;
long dis;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2117974;
const char*myWriteAPIKey = "XEA53209YB12ZY8Z"; 
int statusCode;

void setup() {
  Serial.begin (9600);       
  pinMode(TRIG_PIN, OUTPUT); 
  pinMode(ECHO_PIN, INPUT);  
  servo.attach(SERVO_PIN);   
  servo.write(0);
    ThingSpeak.begin(client);
  WiFi.mode(WIFI_STA);
}

void loop() {
  if(WiFi.status() != WL_CONNECTED){
    Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED){
      WiFi.begin(ssid,pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nconnected.");
  }
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration_us = pulseIn(ECHO_PIN, HIGH);
  distance_cm = 0.017 * duration_us;

  if (distance_cm < DISTANCE_THRESHOLD)
    servo.write(90); 
  else
    servo.write(0); 
    

  Serial.print("distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  delay(500);
  
  Serial.println("Distance: "+String(distance_cm));
  delay(10);
   Serial.println("__________________");
  delay(1000);

  ThingSpeak.setField(1,String(distance_cm));
  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);

  if(statusCode == 200){
    Serial.println("channel updated");
  } else {
    Serial.println("problem in updating");
    String(statusCode);
  }
  delay(15000);
}