#include <Arduino.h>
//OLED Screens
#include <U8g2lib.h>
//DHT SENSOR
#include "DHT.h"
#define DHT11Pin 22
#define DHTType DHT11

U8G2_SSD1306_128X64_NONAME_F_HW_I2C display1(U8G2_R0, 5,4,U8X8_PIN_NONE);
U8G2_SSD1306_128X64_NONAME_F_HW_I2C display2(U8G2_R0, 5,4,U8X8_PIN_NONE);

//Globals
//MILLIS
unsigned long currentMillis;
unsigned long displayTimer;
unsigned long displayDelay = 1000;
unsigned long tempTimer;
unsigned long tempDelay = 1000;

DHT HT(DHT11Pin,DHTType);
float humi;
float tempC;
float tempF;


void setup(void) {
  Serial.begin(9600);
  display1.setI2CAddress(0x78); // sets the address for display 1
  display1.begin(); // initializes display 1
  //display1.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
  display1.clearDisplay(); // clears display 1
  display2.setI2CAddress(0x7A); // sets the address for display 2
  display2.begin(); // initializes display 2
  //display2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
  display2.clearDisplay(); // clears display 2
}

void OLEDDisplay1() {
  display1.clearDisplay();         // clear display
  display1.clearBuffer();          // clear the internal memory
  oledDisplayHeader();
  oledDisplayHumi();
  oledDisplayTempC();
  oledDisplayTempF();
  display1.sendBuffer();          // transfer internal memory to the display
}

void OLEDDisplay2() {
  display2.clearDisplay();         // clear display
  display2.clearBuffer();          // clear the internal memory
  display2.setFont(u8g2_font_ncenB10_tr);
  //display2.drawStr(20,20,"World!");  // write something to the internal memory
  display2.setCursor(20,20);
  display2.println(humi);
  display2.setCursor(20,35);
  display2.println(tempC);
  display2.setCursor(20,50);
  display2.println(tempF);
  display2.sendBuffer();          // transfer internal memory to the display
}

void runDisplays() { 
  if (currentMillis - displayTimer > displayDelay) {
    OLEDDisplay1(); // write to display 1
    OLEDDisplay2(); // write to display 2
    displayTimer = currentMillis; // reset timer
  }
}

void oledDisplayHeader()
{
 display1.setFont(u8g2_font_ncenB08_tr);
 display1.drawStr(0,8, "Humidity");
 display1.drawStr(60,8, "Temperature");
}

void oledDisplayHumi() {
  char buffHumi[8];
  char humiBuff[8];
  dtostrf(humi, 2, 0, humiBuff); //converts float to string
  sprintf(buffHumi, "%s%s", humiBuff, "%"); //creates string
  display1.setFont(u8g2_font_ncenB10_tr); //set the font
  display1.drawStrX2(5, 50, buffHumi); //draws humidity string X2 doubles the current font size
}

void oledDisplayTempC() {
  char buffTempC[10];
  char tempCBuff[10];
  dtostrf(tempC, 8, 1, tempCBuff); //converts float to string
  sprintf(buffTempC, "%s %s", tempCBuff, "C"); //creates string
  display1.setFont(u8g2_font_ncenB10_tr); //set the font
  display1.drawStr(70, 30, buffTempC); //draws the tempC string
}

void oledDisplayTempF() {
  char buffTempF[10];
  char tempFBuff[10];
  dtostrf(tempF, 3, 1, tempFBuff); //converts float to string
  sprintf(buffTempF, "%s %s", tempFBuff, "F"); //creates string
  display1.drawStr(85, 50, buffTempF); //draws the tempF string
}

void checkTemp(){
 //delay(1000);
 if (currentMillis - tempTimer > tempDelay){
 humi  = HT.readHumidity();
 tempC = HT.readTemperature();
 tempF = HT.readTemperature(true);

 Serial.print("Humidity:");
 Serial.print(humi,1);
 Serial.print("%");
 Serial.print(" Temperature:");
 Serial.print(tempC,1);
 Serial.print("C ~ ");
 Serial.print(tempF,1);
 Serial.println("F");
 tempTimer = currentMillis;
 }
}

void loop(void){
  currentMillis= millis(); // start timer
  checkTemp();
  runDisplays();
}