#include <DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>
WiFiClient client;
long myChannelNumber =  2665305;
const char * myWriteAPIKey = "Q06W0MQU6MS4YBTG";
int statusCode;
char ssid[] = "Wokwi-GUEST";
char pass[] = ""; 

int trigger=0;
int echo=2;

DHTesp venmathi;
TempAndHumidity data;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
 venmathi.setup(18, DHTesp::DHT22);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(17, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(5, OUTPUT);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
 venmathi.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() {
  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.");
}
  int distance=finding_distance();
  Serial.println(distance);
  data = venmathi.getTempAndHumidity();
  float temp=data.temperature;
  float humi=data.humidity;
  Serial.println(data.temperature);
  Serial.println(data.humidity);

  if(distance>=300 && temp<=30 && humi>=70){
    digitalWrite(5, HIGH);
    digitalWrite(16, LOW);
    digitalWrite(17, LOW);
    Serial.println("You are safe");
  }
  else if((distance<300)&&(distance>200) && (temp<70)&&(temp>30) && (humi<70)&&(humi>30)){
    digitalWrite(16, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(17, LOW);
    Serial.println("You are unsafe");
  }
  else if(distance<=200 && temp>=70 && humi<=30){
    digitalWrite(17, HIGH);
    digitalWrite(16, LOW);
    digitalWrite(5, LOW);
    Serial.println("You are in danger");
    }
    else{
      digitalWrite(5, LOW);
      digitalWrite(16, LOW);
      digitalWrite(17, LOW);
      Serial.println("Invalid");
    }
    ThingSpeak.setField(1, distance);
    ThingSpeak.setField(2, data.temperature);
    ThingSpeak.setField(3, data.humidity);

     statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);

    if(statusCode == 200) { 
    Serial.println("Channel update successful.");
   }
    else {
    Serial.println("Problem Writing data. HTTP error code :" +
    String(statusCode));
   }
  delay(1000);
 }