Student: Eduard Popa-Costin

Grupa: 332CC

#include <dht11.h> #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h>

#define BUTTON_INCREMENT 2 #define BUTTON_DECREMENT 3 #define BUTTON_MODE 4 #define DHT11PIN_OUTSIDE 7 #define DHT11PIN_INSIDE 6

#define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

dht11 DHT11;

int INA_OUTSIDE = 9; int INB_OUTSIDE = 10; int incrementButtonState = HIGH; int decrementButtonState = HIGH; int lastIncrementButtonState = HIGH; int lastDecrementButtonState = HIGH; unsigned long lastDebounceTime = 0; unsigned long debounceDelay = 50;

unsigned long previousTemperatureTime = 0; long referenceTemperature = 25.00; const unsigned long temperatureInterval = 2000;

bool buttonModeState = false; bool buttonModePressed = false;

bool fanOn = false; bool mode = false;

void setup() {

pinMode(BUTTON_INCREMENT, INPUT);
pinMode(BUTTON_DECREMENT, INPUT);
pinMode(BUTTON_MODE, INPUT_PULLUP);
pinMode(INA_OUTSIDE, OUTPUT); 
pinMode(INB_OUTSIDE, OUTPUT); 
digitalWrite(INA_OUTSIDE, LOW);
digitalWrite(INB_OUTSIDE, LOW);
Serial.begin(9600);

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
  Serial.println(F("SSD1306 allocation failed"));
  for(;;);
}
delay(2000);
display.clearDisplay();

display.setTextSize(1);
display.setTextColor(WHITE);

}

void loop() {

unsigned long currentMillis = millis();
if (digitalRead(BUTTON_MODE) == LOW) {
  if (!buttonModePressed) {
    buttonModePressed = true;
    buttonModeState = !buttonModeState;
  }
} else {
  buttonModePressed = false;
}

if (!buttonModeState) {
  display.clearDisplay();
  display.setCursor(0, 10);
  display.println("Mode: Manual");
  display.setCursor(0, 25);
  display.print("Temp (C): ");
  display.println((float)DHT11.temperature, 2);
  display.setCursor(0, 40);
  display.print("Temp limit (C): ");
  display.println(referenceTemperature);
  display.setCursor(0, 52);
  display.print("Fan: ");
  if (fanOn) {
    display.println("ON");
  }
  else {
    display.println("OFF");
  }
  display.display();

  int reading_increment = digitalRead(BUTTON_INCREMENT);
  int reading_decrement = digitalRead(BUTTON_DECREMENT);

  if (reading_increment != lastIncrementButtonState) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading_increment != incrementButtonState) {
      incrementButtonState = reading_increment;

      if (incrementButtonState == LOW) {
        referenceTemperature++;
      }
    }
  }

  lastIncrementButtonState = reading_increment;

  if (reading_decrement != lastDecrementButtonState) {
    lastDebounceTime = millis();
  }

  
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading_decrement != decrementButtonState) {
      decrementButtonState = reading_decrement; 
      if (decrementButtonState == LOW) {
        referenceTemperature--;
      }
    }
  }

  lastDecrementButtonState = reading_decrement;

  if (currentMillis - previousTemperatureTime >= temperatureInterval) {
    previousTemperatureTime = currentMillis;
    DHT11.read(DHT11PIN_OUTSIDE);
    
    if ((float)DHT11.temperature > referenceTemperature) {
      if (!fanOn) {
        digitalWrite(INA_OUTSIDE, LOW);
        digitalWrite(INB_OUTSIDE, HIGH);
        fanOn = true;
        
      }
    } 
    else {
      if (fanOn) {
        digitalWrite(INA_OUTSIDE, LOW);
        digitalWrite(INB_OUTSIDE, LOW);
        fanOn = false;
      }
    }
  }
  display.display();

}
else {
  display.clearDisplay();
  display.setCursor(0, 10);
  display.println("Mode: Auto");

  if (currentMillis - previousTemperatureTime >= temperatureInterval) {
    previousTemperatureTime = currentMillis;

    DHT11.read(DHT11PIN_OUTSIDE);
    float temperature_outside = DHT11.temperature;
    DHT11.read(DHT11PIN_INSIDE);
    float temperature_inside = DHT11.temperature;
    display.setCursor(0, 25);

    display.print("Temp outside(C) ");
    display.println(temperature_outside, 2);

    display.setCursor(0, 40);
    display.print("Temp inside(C) ");
    display.println(temperature_inside, 2);

    if (temperature_inside <= temperature_outside) {
      if (!fanOn) {
        digitalWrite(INA_OUTSIDE, LOW);
        digitalWrite(INB_OUTSIDE, HIGH);
        fanOn = true;
        display.setCursor(0, 52);
        display.println("Fan: ON");
        display.display();
      }
    } 
    else {
      if (fanOn) {
        digitalWrite(INA_OUTSIDE, LOW);
        digitalWrite(INB_OUTSIDE, LOW);
        fanOn = false;
        display.setCursor(0, 52);
        display.println("Fan: OFF");
        display.display();
      }
    }
  }

}

}

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