BMEwithBlink

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#define LEDPERIOD 250 // 1/2 the LED blink rate
#define READPERIOD 1000 // 1x sample rate
#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme;
int ledState = HIGH;
int
unsigned long ledlastTime = 0;
unsigned long readlastTime = 0;

void setup() {
  Serial.begin(9600);
  Wire.begin();

  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, ledState);

  if (!bme.begin(0x76)) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }
}

void loop() {
  unsigned long lednow = millis();
  unsigned long readnow = millis();

  if(lednow - ledlastTime >= LEDPERIOD){
    ledlastTime = lednow;
    if (ledState == LOW){
      ledState = HIGH;
    }else{
      ledState = LOW;
    }
  }
  digitalWrite(LED_BUILTIN, ledState);

  if(readnow - readlastTime >= READPERIOD){
    readlastTime = readnow;
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println("*C");

    Serial.print("Pressure = ");
    Serial.print(bme.readPressure() / 100.0F);
    Serial.println("hPa");

    Serial.print("Approx. Altitude = ");
    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
    Serial.println("m");

    Serial.print("Humidity = ");
    Serial.print(bme.readHumidity());
    Serial.println("%");

    Serial.println();
  }
}