Technical Specifications:

• Supply Voltage: 1.8 - 5V DC
• Interface: I2C (up to 3.4MHz)
• Operational Range:
• Temperature Range: -40 to +85°C
• Humidity Range: 0-100%
• Pressure Range: 300-1100 hPa
• Resolution:
  • Temperature: 0.01°C
  • Humidity: 0.008%
  • Pressure: 0.18Pa
• Accuracy:
  • Temperature: +-1°C
  • Humidity: +-3%
  • Pressure: +-1Pa
• I2C address:
  • SDO LOW : 0x76
  • SDO HIGH: 0x77

The BME280 is a versatile sensor that can measure temperature, humidity, and atmospheric pressure. It's commonly used in weather stations, environmental monitoring, and IoT projects.

1. Components Required

• Arduino Uno (or any other compatible board)
• BME280 sensor module
• Breadboard
• Jumper wires

2. Wiring Diagram

Arduino          BME280
3.3V   --------> VCC
GND    --------> GND
SDA    --------> SDA (A4 on Arduino Uno)
SCL    --------> SCL (A5 on Arduino Uno)

3. Installing Required Libraries

To interface with the BME280, you need the Adafruit BME280 library. Install it via the Arduino IDE:

1. Open Arduino IDE.
2. Go to Sketch -> Include Library -> Manage Libraries.
3. In the Library Manager, search for "Adafruit BME280" and install it.

4. Basic Code Example

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

Adafruit_BME280 bme; // I2C

void setup() {
  Serial.begin(9600);
  if (!bme.begin(0x76)) {  // Address of the BME280 sensor
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }
}

void loop() {
  Serial.print("Temperature = ");
  Serial.print(bme.readTemperature());
  Serial.println(" *C");

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

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

  Serial.println();
  delay(2000);
}

5. Explanation

• Wire.h: This library enables I2C communication between the Arduino and the sensor.

• Adafruit_Sensor.h: A sensor library required by many Adafruit sensor libraries.

• Adafruit_BME280.h: The specific library for the BME280 sensor.

• bme.begin(0x76): Initializes the sensor with its I2C address (0x76 is common for most modules).

• readTemperature(): Reads the temperature in Celsius.

• readPressure(): Reads the atmospheric pressure in Pascals.

• readHumidity(): Reads the relative humidity in percentage.