#include <Wire.h>
#include <Adafruit_BMP280.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); 

Adafruit_BMP280 bmp;

#define BMP_CS 5
#define BMP_SCK 13
#define BMP_MOSI 23
#define BMP_MISO 19

void setup() {
  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  // Initialize the SPI communication for BMP280
  pinMode(BMP_CS, OUTPUT);
  digitalWrite(BMP_CS, HIGH);
  SPI.begin(BMP_SCK, BMP_MISO, BMP_MOSI, BMP_CS);
  
  Serial.println("BMP280 Initialized");
  lcd.setCursor(0, 0);
  lcd.print("BMP280 Initialized");

  delay(2000);
  lcd.clear();
}


uint32_t readBMP280Pressure() {
  uint8_t msb, lsb, xlsb;
  uint32_t rawPressure;

  // Read PRESS_MSB (0xF7), PRESS_LSB (0xF8), and PRESS_XLSB (0xF9)
  digitalWrite(BMP_CS, LOW); // Enable chip select
  SPI.transfer(0xF7); // PRESS_MSB address
  msb = SPI.transfer(0x00);
  digitalWrite(BMP_CS, HIGH); // Disable chip select

  digitalWrite(BMP_CS, LOW);
  SPI.transfer(0xF8); // PRESS_LSB address
  lsb = SPI.transfer(0x00);
  digitalWrite(BMP_CS, HIGH);

  digitalWrite(BMP_CS, LOW);
  SPI.transfer(0xF9); // PRESS_XLSB address
  xlsb = SPI.transfer(0x00);
  digitalWrite(BMP_CS, HIGH);

  // Combine the three bytes to get the raw pressure value
  rawPressure = ((uint32_t)msb << 12) | ((uint32_t)lsb << 4) | ((uint32_t)xlsb >> 4);
  return rawPressure;
}

void loop() {
  // Read the raw pressure from BMP280
  uint32_t rawPressure = readBMP280Pressure();

  // Convert raw pressure to hPa (hectopascals) using your calibration values if needed
  float pressure = rawPressure / 256.0; // Example conversion (adjust as necessary)

  // Display the pressure on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Pressure: ");
  lcd.setCursor(0, 1);
  lcd.print(pressure);
  lcd.print(" hPa");

  // Print the pressure to the serial monitor for debugging
  Serial.print("Raw Pressure: ");
  Serial.println(rawPressure);
  Serial.print("Pressure: ");
  Serial.print(pressure);
  Serial.println(" hPa");

  delay(1000); // Delay for a second
}