esp8266_oled_i2c_dht_ssd1309

#include <Arduino.h>
#include <DHT.h>
#include <DHT_U.h>
#include <U8g2lib.h>
//#include <SPI.h>
//#include <SD.h>
//const int chipSelectPin = 10;

#define SDA_PIN 19
#define SCL_PIN 20

#define DHTTYPE    DHT22
char temperature [5];
char humidity [5];
const char DEGREE_SYMBOL[] = { 0xB0, '\0' };

DHT dht(7, DHTTYPE);

U8G2_SSD1309_128X64_NONAME0_F_HW_I2C u8g2(U8G2_R0, /* clock=*/ SCL_PIN, /* data=*/ SDA_PIN, /* reset=*/ U8X8_PIN_NONE);

void setup() {
  dht.begin();
  Serial.begin(9600);

  u8g2.begin();

  u8g2.setI2CAddress(0x3C);


  //u8g2.setColorIndex(0);
}

void loop() {
  u8g2.firstPage();
  do {
    draw();
  } while( u8g2.nextPage() );
}

void draw(){
  u8g2.enableUTF8Print();
  u8g2.setFont(u8g2_font_helvB10_tf);


  readTemperature();
  readHumidity();

  u8g2.drawRFrame(0,0,128,31,5);               // upper frame
  u8g2.drawRFrame(0,33,128,31,5);              // lower frame


  u8g2.drawStr( 3, 20, "Teplota: ");
  u8g2.drawStr( 70, 20, temperature);
  u8g2.drawUTF8(100, 20, DEGREE_SYMBOL);
  u8g2.drawUTF8(105, 20, "C");

  u8g2.drawStr(3,55, "Vlhkost: ");
  u8g2.drawStr( 70, 55, humidity);
  u8g2.drawStr(105,55, "%");
}

void readTemperature()
{
 float t = dht.readTemperature();
 dtostrf(t, 3, 1, temperature);
}

void readHumidity()
{
 float h = dht.readHumidity();
 dtostrf(h, 3, 1, humidity);
}