The GY-BMP280 Barometer Sensor is a breakout board for Bosch BMP280 high-precision and low-power digital barometer. It can be used to measure temperature and atmospheric pressure accurately. It can be connected to a microcontroller with I2C. As the atmospheric pressure changes with altitude, it can also measure approximate altitude of a place. We have also provided highly abstracted library to make this product easier to use.

Features

• Smaller footprint, lower power consumption, lower noise measurements, lower RMS noise.
• Higher resolutions for pressure and temperature, higher measuring rate.
• Easy-to-use Crowtail Compatible Interface.
• Can be used as an altimeter with accuracy of ±1 meter.
  

Specifications

• Supply Voltage:  3.3V
• Current Consumption: 0.6 mA
• Barometric Pressure Measure Range: 300 – 1100 hPa Accuracy: ±1.0 hPa
• Temperature Measurement Range: -40 to 85 Accuracy: ±1
• Interface: I2C
• Crowtail Port: I2C
• Dimensions: 11.5mm x 15mm
  

How to Interface BMP280 with Arduino?

To interface the BMP280 sensor with an Arduino Uno, you'll need to connect the sensor to the Arduino and use a library to read data from the sensor. The BMP280 is a barometric pressure and temperature sensor, and it communicates over I2C.

Materials Needed:

• BMP280 sensor
• Arduino Uno
• Jumper wires
• Breadboard (optional)

Connections:

1. Power Supply:

   • VCC on BMP280 to 5V on Arduino (or 3.3V if the BMP280 module is designed for 3.3V operation).
   • GND on BMP280 to GND on Arduino.

2. I2C Communication:

   • SCL on BMP280 to A5 (SCL) on Arduino Uno.
   • SDA on BMP280 to A4 (SDA) on Arduino Uno.

Code Example:

You will need the Adafruit_BMP280 library to interact with the BMP280 sensor. Install it via the Arduino Library Manager or from GitHub.

Here's a basic example code to get you started:

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

// Create an instance of the BMP280 sensor
Adafruit_BMP280 bmp;

void setup() {
  Serial.begin(9600);
  
  // Initialize the sensor
  if (!bmp.begin(0x76)) { // Check the I2C address, it can also be 0x77
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
  
  Serial.println("BMP280 sensor ready!");
}

void loop() {
  // Read temperature and pressure
  float temperature = bmp.readTemperature();
  float pressure = bmp.readPressure();
  
  // Print temperature and pressure values
  Serial.print("Temperature = ");
  Serial.print(temperature);
  Serial.println(" *C");
  
  Serial.print("Pressure = ");
  Serial.print(pressure / 100.0F); // Convert Pa to hPa
  Serial.println(" hPa");
  
  delay(2000); // Wait a bit between readings
}

Libraries:

• Adafruit BMP280: Provides functions to interact with the BMP280 sensor.
• Wire: Handles I2C communication.

Additional Notes:

• The BMP280 can have two possible I2C addresses: 0x76 or 0x77. The address is set by a pin on the sensor. Ensure the address in the bmp.begin() function matches the actual address of your sensor.
• The Adafruit_BMP280 library simplifies the process of reading temperature and pressure from the BMP280 sensor.
• You can use the serial monitor to view the temperature and pressure readings.

If you have any issues or questions about the setup or code, feel free to ask!