#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include <DHT.h>
#include <LiquidCrystal.h>
#include <SPI.h>

#define BMP_SCK  (13)
#define BMP_MISO (12)
#define BMP_MOSI (11)
#define BMP_CS   (10)
#define DHTPIN 7       // DHT22 data pin
#define DHTTYPE DHT22  // DHT22 type
#define BUTTON_PIN 6   // Push button pin

DHT dht (DHTPIN , DHTTYPE );

Adafruit_BMP280 bmp;

int RS = 12, E = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(RS, E, d4, d5, d6, d7);

const int buttonPin = 6;

int buttonState = 0;      
int lastButtonState = 0;  
int screen = -1; 

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  lcd.begin(16, 2);   // Initialisation de l'écran LCD
  dht.begin();
  bmp.begin();
  Serial.begin(9600);

  lcd.print("Weather Station");
  delay(2000);
  lcd.clear();
  


  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     
                  Adafruit_BMP280::SAMPLING_X2,     
                  Adafruit_BMP280::SAMPLING_X16,    
                  Adafruit_BMP280::FILTER_X16,      
                  Adafruit_BMP280::STANDBY_MS_500); 
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH && lastButtonState == LOW) {
    screen = (screen + 1) % 3;  
    updateScreen(screen);
    
  }

  lastButtonState = buttonState;
  float temp = dht.readTemperature();
  float humi = dht.readHumidity();

  if (isnan(humi) || isnan(temp)) {
    lcd.setCursor(0, 0);
    lcd.print("Failed to read DHT");
  }

  delay(100);  
}

void updateScreen(int screen) {
  lcd.clear();
  lcd.setCursor(15, 1);
  lcd.print(String(screen + 1));
  lcd.setCursor(2, 0);

  if (screen == 0) {
    float temp = dht.readTemperature();
    lcd.print("Temp: ");
    
    lcd.print(temp);
    lcd.print(" C");
  } else if (screen == 1) {
    float humi = dht.readHumidity();
    lcd.print("Hum: ");
   
    lcd.print(humi);
    lcd.print(" %");
  } else if (screen == 2) {
    float pressure = bmp.readPressure() / 100.0; 
    lcd.setCursor(2, 0);
    lcd.print("Pressure: ");
    lcd.setCursor(3, 1);
    lcd.print(pressure);
    lcd.print(" hPa");
  } 
}