#include "DHT.h"

const int buttonPin = 35;  // Pin tin hieu nut nhan
const int ledPin = 2;      // Pin dieu khien den LED

int ledState;              // Trang thai LED
int buttonState;           // Trang thai nut nhan

#define DHTPIN 4           // Pin cho DHT22
#define DHTTYPE DHT22      // Loai DHT

DHT dht(DHTPIN, DHTTYPE);  // Khoi tao DHT22
float h, t;                // Bien luu gia tri do am, nhiet do

void setup() {
  Serial.begin(115200);    // Khoi tao giao tiep Serial
  pinMode(ledPin, OUTPUT); // Cai dat pin LED lam output
  pinMode(buttonPin, INPUT); // Cai dat pin nut nhan lam input
  digitalWrite(ledPin, LOW); // Mac dinh den LED tat
  dht.begin();             // Khoi dong DHT
  Serial.println("Bat dau");
}

void ReadingDHT22() {
  h = dht.readHumidity(); 
  t = dht.readTemperature(); 

  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
}

void loop() {
  ReadingDHT22();               // Doc gia tri tu DHT22
  buttonState = digitalRead(buttonPin);  // Doc trang thai nut nhan

  if (buttonState == HIGH) {    // Neu nut nhan duoc bam
    Serial.println("KIEM TRA");

    if (h >= 70) {
      ledState = HIGH;          // Neu do am >= 70% thi bat LED
    } else {
      ledState = LOW;           // Neu do am < 70% thi tat LED
    }

    digitalWrite(ledPin, ledState);  // Dieu khien LED theo trang thai

    // In ra cac gia tri doc duoc
    Serial.println("Data log ");
    Serial.print("Do Am: ");
    Serial.print(h);
    Serial.println("%");
    Serial.print("Nhiet Do: ");
    Serial.print(t);
    Serial.println("°C ");
  }

  // Kiem tra trang thai LED va in thong tin tuong ung
  if (ledState == HIGH) {
    Serial.println("Do am tren 70%");
    Serial.println("Bat LED");
  } else {
    Serial.println("Do am duoi 70%");
    Serial.println("Tat LED");
  }

  Serial.println("-----------------");
  delay(100);
}