#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define DHT_TYPE DHT22
#define DHT_PIN 2
#define LED 8
#define LED2 9
DHT dht(DHT_PIN, DHT_TYPE);
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
   dht.begin();
   pinMode(LED, OUTPUT);
   pinMode(LED2, OUTPUT);
   Serial.begin(9600);
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  delay(2000);
  oled.clearDisplay();
}
void mostrar(float h, float t){
  if(t >= 30){
      digitalWrite(LED,1);
   }else{
      digitalWrite(LED,0);
   }
  oled.setCursor(0, 20); 
  oled.print("Temperatura");
  oled.setCursor(80, 20);
  oled.print(t);
  oled.setCursor(120,20);
  oled.print("C");
  oled.setCursor(0,45);
  oled.print("Humidade");
  oled.setCursor(80,45);
  oled.print(h);
  oled.setCursor(120,45);
  oled.print("%");
  oled.display();  
}
float tAnt, hAnt;
void loop() {
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  if(h <= 20){
     digitalWrite(LED2,!digitalRead(LED2));
  }
  if (!isnan(h) || !isnan(t)) {
  if(t != tAnt || h != hAnt ){
      Serial.println("Temperatura: " + String(t) + " oC");
      Serial.println("Humidade: " + String(h) + " %");
      tAnt = t;
      hAnt = h;
      mostrar(h,t);
  }
  }else{
    Serial.println("Problema no Sensor de temperatura.");
  }
  delay(1000);
}