For the embedded controls subsystem
#include <Wire.h> // For I2C communication to LCD #include <LiquidCrystal_I2C.h> // For 16x2 I2C LCD #include <Adafruit_BME280.h> // Adafruit BME280 library #include <SPI.h> // Required for SPI mode BME280
// ------------------------------- // SPI PIN DEFINITIONS (Uno) // ------------------------------- // SCK = 13 // MISO = 12 // MOSI = 11 // CS = Any digital pin (we choose 10)
#define BME_CS 10 // Chip select for BME280 on SPI
// Create BME280 object in SPI mode Adafruit_BME280 bme(BME_CS, SPI);
// Create LCD object: 0x27 is common, yours may be 0x3F LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() { // put your setup code here, to run once:
// Initialize serial for debugging Serial.begin(9600);
// Initialize LCD lcd.init(); // Start LCD lcd.backlight(); // Turn on LCD backlight
// ------------------------------- // Initialize BME280 in SPI mode // ------------------------------- bool status = bme.begin();
if (!status) { lcd.clear(); lcd.print("BME280 ERROR"); Serial.println("Could not find BME280! Check wiring."); while (1); // Halt so user notices the issue }
// Display boot message lcd.clear(); lcd.setCursor(0, 0); lcd.print("BME280 (SPI)"); lcd.setCursor(0, 1); lcd.print("Initializing..."); delay(1500);
}
void loop() { // put your main code here, to run repeatedly:
// Read temperature and pressure from sensor float temperature = bme.readTemperature(); // Celsius float pressure = bme.readPressure() / 100.0; // Convert Pa → hPa
// Clear and update LCD lcd.clear(); lcd.setCursor(0, 0); lcd.print("Temp: "); lcd.print(temperature, 1); // One decimal place lcd.print(" C");
lcd.setCursor(0, 1); lcd.print("Press: "); lcd.print(pressure, 1); lcd.print(" hPa");
delay(1000); // Update once per second
}