#include <ThingSpeak.h>
#include <DHTesp.h>
#include <WiFi.h>
DHTesp dhtsensor;
TempAndHumidity data;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
long myChannelNumber = 2615088;
const char * myWriteAPIKey = "N0RS1TCZISSPN4KM";
int statusCode;
int trigger = 12;
int echo = 14;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(21, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  dhtsensor.setup(18, DHTesp::DHT22);
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  // put your setup code here, to run once:
  Serial.begin(115200);
}
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.");
  // put your main code here, to run repeatedly:
  if (WiFi.status() == WL_CONNECTED)
  {
    data = dhtsensor.getTempAndHumidity();
    int actual_distance = ultrasonic();
    Serial.println(actual_distance);
    Serial.println("Humi : " + String(data.humidity));
    Serial.println("Temp : " + String(data.temperature));
    Serial.println("-----------------");
    delay(1000);
    if (actual_distance >= 300 && data.temperature >= 50 && data.humidity <= 20)
    { //41,306,15
      digitalWrite(21, HIGH);
      digitalWrite(4, LOW);
      digitalWrite(2, LOW);
      Serial.println("you are safe");
    }
    else if (actual_distance >= 200 && actual_distance <= 300 && data.temperature > 20 && data.temperature < 50 && data.humidity > 20 && data.humidity < 50) {
      digitalWrite(21, LOW);
      digitalWrite(4, HIGH);
      digitalWrite(2, LOW);
      Serial.println("you are unsafe");
    }
    else if (actual_distance <= 200 && data.temperature < 20 && data.humidity > 50) {
      digitalWrite(4, LOW);
      digitalWrite(2, HIGH);
      digitalWrite(21, LOW);
      Serial.println("you are danger");
    }
    else {
      digitalWrite(4, LOW);
      digitalWrite(2, LOW);
      digitalWrite(21, LOW);
    }
    ThingSpeak.setField(1, data.temperature);
    ThingSpeak.setField(2, data.humidity);
    ThingSpeak.setField(3, actual_distance);
    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));
    }
    delay(10); // this speeds up the simulation
  }
}
int ultrasonic () {
  digitalWrite(trigger, LOW);
  delay(10);
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  int distance = pulseIn(echo, HIGH);
  // return(distance);
  return (distance * 0.034 / 2) + 1;

}