#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_BME680.h>

// Change this if you want altitude computed for your location
#define SEALEVEL_HPA (1013.25f)

// Try both common I2C addresses
Adafruit_BME680 bme; // use the default constructor

bool beginBME680() {
  // SDA on pin 21 and SCL on pin 22
  Wire.begin(21, 22);

  // Try 0x76 first
  if (bme.begin(0x76, &Wire)) {
    Serial.println("[BME680] Found at 0x76");
    return true;
  }
  // Then 0x77
  if (bme.begin(0x77, &Wire)) {
    Serial.println("[BME680] Found at 0x77");
    return true;
  }

  Serial.println("[BME680] Sensor not found at 0x76 or 0x77. Check wiring/power.");
  return false;
}

void setupBME680() {
  // Oversampling & filter settings tuned for ~1 Hz updates
  bme.setTemperatureOversampling(BME680_OS_8X);
  bme.setHumidityOversampling(BME680_OS_2X);
  bme.setPressureOversampling(BME680_OS_4X);
  bme.setIIRFilterSize(BME680_FILTER_SIZE_3);

  // Enable gas heater: 320°C for 150 ms (typical example)
  bme.setGasHeater(320, 150);
}

void setup() {
  Serial.begin(115200);
  while (!Serial) { delay(100); }

  Serial.println("\n[BOOT] BME680 serial demo (1 Hz)");

  if (!beginBME680()) {
    // Stay here so you can read the error
    while (true) { delay(1000); }
  }

  setupBME680();
}

void loop() {
  // Trigger a reading and wait for completion
  if (!bme.performReading()) {
    Serial.println("[BME680] Failed to perform reading!");
    delay(1000);
    return;
  }

  // Values from the Adafruit_BME680 library:
  float temperatureC = bme.temperature;               // °C
  float pressureHpa  = bme.pressure / 100.0f;         // Pa -> hPa
  float humidityPct  = bme.humidity;                  // %
  float gasOhms      = bme.gas_resistance;            // Ω
  float altitudeM    = bme.readAltitude(SEALEVEL_HPA);// meters (approx.)

  // Print nicely
  Serial.print("T: ");  Serial.print(temperatureC, 2); Serial.print(" °C  | ");
  Serial.print("RH: "); Serial.print(humidityPct, 1);  Serial.print(" %  | ");
  Serial.print("P: ");  Serial.print(pressureHpa, 2);  Serial.print(" hPa  | ");
  Serial.print("Gas: ");Serial.print(gasOhms, 0);      Serial.print(" Ω  | ");
  Serial.print("Alt: ");Serial.print(altitudeM, 1);    Serial.println(" m");

  // 1 Hz update
  delay(1000);
}