/*
the red led is the heating element
The wite LED can be any diode
update the DHTTYPE to match your sensor
*/

#include <LiquidCrystal.h>
#include "DHT.h"

const int button1Pin = 9; // Button 1 pin
const int button2Pin = 10; // Button 2 pin

int lastButton1State = HIGH; // Previous state of button 1
int lastButton2State = HIGH; // Previous state of button 2

volatile int temp = 40; // Default temperature

int tempChangeAmount = 5; // Amount by which temperature changes per button press

// Set the DHT Pin
#define DHTPIN 8

// Initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
#define DHTTYPE DHT22   // Change this to match your sensor, DHT11 in my case
DHT dht(DHTPIN, DHTTYPE);

const int heater = 6;

void setup() {
  pinMode(button1Pin, INPUT); // Button 1 with internal pull-up resistor
  pinMode(button2Pin, INPUT); // Button 2 with internal pull-up resistor

  // Set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  dht.begin();
  
  // Print a message to the LCD
  lcd.print("Temp: Humi: Tar:");

  pinMode(heater, OUTPUT);
  digitalWrite(heater, HIGH);

  // Initialize Serial communication for debugging
  Serial.begin(9600);
  Serial.println("Setup complete.");
}

void loop() {
  unsigned long currentMillis = millis();

  // Check if it's time to update the LCD
  static unsigned long lastUpdateTime = 0;
  const unsigned long updateInterval = 500; // Update interval in milliseconds

  if (currentMillis - lastUpdateTime >= updateInterval) {
    lastUpdateTime = currentMillis;

    // Read temperature in Fahrenheit
    float t = dht.readTemperature();
    float h = dht.readHumidity();

    // Set the cursor to column 0, line 1
    lcd.setCursor(0, 1);

    if (isnan(t)) {
      lcd.print("ERROR");
    } else {
      lcd.print(t);
      lcd.setCursor(6, 1);
      lcd.print(h);
      //lcd.print("F"); // Clear any previous text after the temperature
      lcd.print("    "); // Clear any previous text after the temperature to ensure no remnants
    }

    // Control the heater based on temperature
    if (t < temp) {
      digitalWrite(heater, LOW);
    } else {
      digitalWrite(heater, HIGH);
    }

    // Print current temperature set point
    lcd.setCursor(13, 1);
    if (temp < 100) {
      lcd.print("   "); // Clear any potential leftover character
    }
    lcd.setCursor(13, 1);
    lcd.print(temp);
  }

  // Button 1 state change detection
  int reading1 = digitalRead(button1Pin);
  if (reading1 != lastButton1State) {
    if (reading1 == LOW) {
      temp += tempChangeAmount;
      if (temp > 99) {
        temp = 99; // Limit temp to 99 degrees Fahrenheit
      }
      Serial.print("Button 1 pressed. Temp: ");
      Serial.println(temp);
      // Update LCD immediately after button press (optional)
      lcd.setCursor(13, 1);
      if (temp < 100) {
        lcd.print("   "); // Clear any potential leftover character
      }
      lcd.setCursor(13, 1);
      lcd.print(temp);
    }
    lastButton1State = reading1;
  }

  // Button 2 state change detection
  int reading2 = digitalRead(button2Pin);
  if (reading2 != lastButton2State) {
    if (reading2 == LOW) {
      temp -= tempChangeAmount;
      if (temp < 0) {
        temp = 0; // Limit temp to 0 degrees Fahrenheit
      }
      Serial.print("Button 2 pressed. Temp: ");
      Serial.println(temp);
      // Update LCD immediately after button press (optional)
      lcd.setCursor(13, 1);
      if (temp < 100) {
        lcd.print("   "); // Clear any potential leftover character
      }
      lcd.setCursor(13, 1);
      lcd.print(temp);
    }
    lastButton2State = reading2;
  }

  // Delay to debounce buttons (optional)
  delay(50);
}