#include <DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>
char ssid[] = "Wokwi-GUEST";
char pass[] = "";  
#define buzzer 21
DHTesp sen;
TempAndHumidity data;
WiFiClient client;
long myChannelNumber = 2653077;
const char * myWriteAPIKey = "1VQKDW8ZKFI9JNW3";
int statusCode;

int trigger=4;
int echo=5;
int r=26,o=33,g=32;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  sen.setup(18, DHTesp::DHT22);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  pinMode(buzzer, OUTPUT); 
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(r, OUTPUT);
  pinMode(o, OUTPUT);
  pinMode(g, OUTPUT);
}

int finding_distance(){
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  float a=pulseIn(echo, HIGH);
  return ( a*0.034/2);
}
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.");
  } 
  data = sen.getTempAndHumidity();
  int t=data.temperature;
  int h=data.humidity;
  int d=finding_distance();
  if (d>=300 && t<30 && h>=70){
  Serial.println("You are safe");
  digitalWrite(g,HIGH);
  digitalWrite(o, LOW);
  digitalWrite(r, LOW);
  noTone(buzzer);
  }
  else if (d>=200 && d<300 && t>=30 && t<70 && h>=30 && h<70){
  Serial.println("You are unsafe");
  digitalWrite(o, HIGH);
  digitalWrite(r, LOW);
  digitalWrite(g, LOW);
  noTone(buzzer);
  }
  else if (d<200 && t>=70 && h<30){
  Serial.println("You are in DANGER!!!");
  digitalWrite(r, HIGH);
  digitalWrite(o, LOW);
  digitalWrite(g, LOW);
  tone(buzzer,256,2000);
  }
  else {
  digitalWrite(r, LOW);
  digitalWrite(o, LOW);
  digitalWrite(g, LOW);
  noTone(buzzer);
  }
  ThingSpeak.setField(1, t);
   ThingSpeak.setField(2, h);
    ThingSpeak.setField(3, d);

  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);

if(statusCode == 200) { //successful writing code
Serial.println("Channel update successful.");
}
else {
Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
}

  // put your main code here, to run repeatedly:
   // this speeds up the simulation
}