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

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

WiFiClient client;
long ChannelNum =  2655571;
const char * WriteAPIKey = "NNW6JYIMC8CPIS38";
int statusCode;


DHTesp jeeva;
TempAndHumidity data;

int echo=5, trigger=18;
int rled=13, yled=27, gled=33;
int d,hum,temp,range;
String message;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  WiFi.mode(WIFI_STA);

  ThingSpeak.begin(client);

  pinMode(echo, INPUT);
  pinMode(trigger, OUTPUT);
  pinMode(rled, OUTPUT);
  pinMode(yled, OUTPUT);
  pinMode(gled, OUTPUT);
  jeeva.setup(15, DHTesp::DHT22);
}

int finding_distance(){
  
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  float a=pulseIn(echo, HIGH);
  return(a*0.034/2);
}


void loop() {
  // put your main code here, to run repeatedly:

    if(WiFi.status() != WL_CONNECTED)  
  {
  Serial.print("CONNECTING...");
    while(WiFi.status() != WL_CONNECTED)
    {
    WiFi.begin(ssid, pass); 
    Serial.print(".");
    delay(5000);
    }
  Serial.println("\nConnected.");
  }


  data= jeeva.getTempAndHumidity();
  int d=finding_distance();
  int hum=int(data.humidity);
  int temp=int(data.temperature);

  if(d>300 && temp<30 && hum>70) {
    message = "YOU ARE SAFE";
    digitalWrite(gled, HIGH);
    digitalWrite(yled, LOW);
    digitalWrite(rled, LOW);
    range =  0;
  } else if(d<300 && d>200 && temp>30 && temp<70 && hum>30 && hum<70) {
      message = "YOU ARE UNSAFE";
      digitalWrite(yled, HIGH);
      digitalWrite(rled, LOW);
      digitalWrite(gled, LOW);
      range = 1;
    } else if(d<200 && temp>=70 && hum<=30) {
      message = "YOU ARE IN DANGER";
      digitalWrite(rled, HIGH);
      digitalWrite(yled, LOW);
      digitalWrite(gled, LOW);
      range = 2;
      }
      else{
        digitalWrite(rled, LOW);
        digitalWrite(yled, LOW);
        digitalWrite(gled, LOW);
      }
  Serial.println(d);
  Serial.println(hum);
  Serial.println(temp);
  Serial.println(message);
  Serial.println("-----------------");
  delay(1000);

  ThingSpeak.setField(1, d);
  ThingSpeak.setField(2, temp);
  ThingSpeak.setField(3, hum);
  ThingSpeak.setField(4, range);

  statusCode = ThingSpeak.writeFields(ChannelNum,WriteAPIKey);

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