#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>
#define DHTTYPE DHT22 
const int DHTPIN = 4;
DHT dht(DHTPIN, DHTTYPE);
 
const int Led = 8;
const int maxTemp = 80; // nhiet do cao nhat

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* serverName = "http://567.335.276.106:1880/update-sensor";
unsigned long lastTime = 0;
unsigned long timerDelay = 5000;
 
void setup() {
  pinMode(Led,OUTPUT);
  Serial.begin(115200);
  dht.begin();
 
  //wifi
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  Serial.println("Timer 5s");
}
 
void loop() {
  //Send an HTTP POST request every 10 minutes
  if ((millis() - lastTime) > timerDelay) {
    
    float tC = dht.readTemperature();
    Serial.print(tC);
 
    if(tC >= maxTemp) {
      digitalWrite(Led,HIGH);
    } else{
      digitalWrite(Led,LOW);
    }
    // kiểm tra xem nhiệt độ có quá không, nếu quá 80 độ => gửi request
    if(WiFi.status()== WL_CONNECTED && tC >= maxTemp){
      WiFiClient client;
      HTTPClient http;
      http.begin(client, serverName);
      http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      String httpRequestData = "api_key=1234&sensor=DS18B20&alarm=1";           
      int httpResponseCode = http.POST(httpRequestData);
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
      http.end();
    }
    lastTime = millis();
  }
}