#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
OneWire oneWire(7); // Pin yang terhubung ke data pin sensor DS18B20
DallasTemperature sensors(&oneWire);

int setPoint = 5;
const int relayPin = 6;  // Pin untuk relay

const int buttonIncreasePin = 2;
const int buttonDecreasePin = 8;
const int buttonDisplayPin = 4;

unsigned long lastDebounceTimeIncrease = 0;
unsigned long lastDebounceTimeDecrease = 0;
unsigned long lastDebounceTimeDisplay = 0;
unsigned long debounceDelay = 400;

bool displayMode = false;
bool needUpdate = true;

void setup() {
  Serial.begin(9600);
    lcd.init();
      lcd.backlight();
        lcd.setCursor(3,0);
          lcd.print("WELCOME...");
            delay(2000);
              lcd.clear();

                pinMode(buttonDisplayPin, INPUT_PULLUP);
                  pinMode(buttonIncreasePin, INPUT_PULLUP);
                    pinMode(buttonDecreasePin, INPUT_PULLUP);
                      pinMode(relayPin, OUTPUT);

                        sensors.begin();
                        }

                        void loop() {
                          if (digitalRead(buttonDecreasePin) == LOW) {
                              if ((millis() - lastDebounceTimeDecrease) > debounceDelay) {
                                    if (setPoint > -30) {
                                            setPoint--;
                                                    displayMode = false;
                                                            needUpdate = true;
                                                                  }
                                                                        lastDebounceTimeDecrease = millis();
                                                                            }
                                                                              }

                                                                                if (digitalRead(buttonIncreasePin) == LOW) {
                                                                                    if ((millis() - lastDebounceTimeIncrease) > debounceDelay) {
                                                                                          if (setPoint < 10) {
                                                                                                  setPoint++;
                                                                                                          displayMode = false;
                                                                                                                  needUpdate = true;
                                                                                                                        }
                                                                                                                              lastDebounceTimeIncrease = millis();
                                                                                                                                  }
                                                                                                                                    }

                                                                                                                                      if (digitalRead(buttonDisplayPin) == LOW) {
                                                                                                                                          if ((millis() - lastDebounceTimeDisplay) > debounceDelay) {
                                                                                                                                                displayMode = true;
                                                                                                                                                      needUpdate = true;
                                                                                                                                                            lastDebounceTimeDisplay = millis();
                                                                                                                                                                }
                                                                                                                                                                  }

                                                                                                                                                                    if (needUpdate || (millis() - lastDebounceTimeDisplay) > 2000) {
                                                                                                                                                                        lastDebounceTimeDisplay = millis();
                                                                                                                                                                            lcd.clear();
                                                                                                                                                                                sensors.requestTemperatures(); 
                                                                                                                                                                                    float t = sensors.getTempCByIndex(0);  // Membaca suhu dalam Celsius

                                                                                                                                                                                        Serial.print("Reading Temperature: ");
                                                                                                                                                                                            Serial.println(t);
                                                                                                                                                                                                
                                                                                                                                                                                                    if (isnan(t)) {
                                                                                                                                                                                                          lcd.setCursor(2, 1);
                                                                                                                                                                                                                lcd.print("Error");
                                                                                                                                                                                                                    } else {
                                                                                                                                                                                                                          // Logic to control the relay
                                                                                                                                                                                                                                if (t > setPoint + 2) {
                                                                                                                                                                                                                                        digitalWrite(relayPin, LOW);  // Turn off the relay
                                                                                                                                                                                                                                              } else if (t < setPoint - 2) {
                                                                                                                                                                                                                                                      digitalWrite(relayPin, HIGH);  // Turn on the relay
                                                                                                                                                                                                                                                            }

                                                                                                                                                                                                                                                                  if (displayMode) {
                                                                                                                                                                                                                                                                          lcd.setCursor(2, 0);
                                                                                                                                                                                                                                                                                  lcd.print("Temp : ");
                                                                                                                                                                                                                                                                                          lcd.setCursor(2, 1);
                                                                                                                                                                                                                                                                                                  lcd.print(t);
                                                                                                                                                                                                                                                                                                          lcd.print((char)223);
                                                                                                                                                                                                                                                                                                                  lcd.print("C");
                                                                                                                                                                                                                                                                                                                        } else {
                                                                                                                                                                                                                                                                                                                                lcd.setCursor(4,0);
                                                                                                                                                                                                                                                                                                                                        lcd.print("Set Suhu");
                                                                                                                                                                                                                                                                                                                                                lcd.setCursor(6,1);
                                                                                                                                                                                                                                                                                                                                                        lcd.print(setPoint);
                                                                                                                                                                                                                                                                                                                                                              }
                                                                                                                                                                                                                                                                                                                                                                  }
                                                                                                                                                                                                                                                                                                                                                                      needUpdate = false;
                                                                                                                                                                                                                                                                                                                                                                        }
                                                                                                                                                                                                                                                                                                                                                                        }