#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>


#include "DHT.h"



//====================================== Temperatureinstellungen
#define solltemp 18
#define stufe1 solltemp+4
#define stufe2 solltemp+5
#define stufe3 solltemp+6
#define stufe4 solltemp+8
#define stufe5 solltemp+10
//==============================================================

#define DHTPIN 2
#define FanPin 9
#define DHTTYPE DHT22


#define i2c_Address 0x3c

#define SCREEN_WIDTH 128 // OLED display width
#define SCREEN_HEIGHT 64 // OLED display height
#define OLED_RESET -1   //   QT-PY / XIAO
Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);



float temp;
String status;

DHT dht(DHTPIN, DHTTYPE);

void setup()
{

  display.begin(i2c_Address, true);
  display.display();
  delay(2000);
  display.clearDisplay();


  dht.begin();

  pinMode(FanPin, OUTPUT);
}


void loop()
{
  // Lüftersteuerung
  delay(2000);
  float temp = dht.readTemperature();
  if (temp <= solltemp) {
    digitalWrite(FanPin, LOW);
    status = "AUS      ";
  } else if (temp >= stufe5) {
    digitalWrite(FanPin, HIGH);
    status = "Stufe-MAX";
  } else if (temp >= stufe4) {
    digitalWrite(FanPin, 220);
    status = "Stufe-4  ";
  } else if (temp >= stufe3) {
    analogWrite(FanPin, 150);
    status = "Stufe-3  ";
  } else if (temp >= stufe2) {
    analogWrite(FanPin, 90);
    status = "Stufe-2  ";
  } else if (temp >= stufe1) {
    digitalWrite(FanPin, 65);
    status = "Stufe-1  ";
  } else if (temp <= solltemp) {
    analogWrite(FanPin, 55);
    status = "Stufe-LOW";
  }

  // text display
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0, 0);
  display.println("Lueftersteuerung");
  display.println ("");
  display.print("Aktuell: ");
  display.print (temp);
  display.println (" Grad C");
  display.print ("Solltemp: ");
  display.print (solltemp);
  display.print (" Grad C");
  delay(2000);
  display.display ();
  display.clearDisplay();

}