The GY BMP280 is a high-precision, low-power digital sensor designed to measure barometric pressure and temperature. Ideal for weather forecasting, altitude measurement, and environmental monitoring, this sensor module is based on the Bosch BMP280, providing accurate and reliable readings. It supports both I2C and SPI interfaces, making it highly versatile and easy to integrate into various microcontroller platforms like Arduino, ESP32, and Raspberry Pi.

With its 5V operating voltage, this module is perfect for projects requiring precise atmospheric data and temperature measurements. Whether you're building a DIY weather station, developing an altitude-sensitive application, or just exploring environmental sensing, the GY BMP280 5V version is a great choice.

Technical Specifications:

• Pressure range: 300 ~ 1100hPa (altitude 9000m~-500m)
• Power supply voltage: 1.8V~5.0V
• Accuracy between 700 to 900hPa and 25 to 40 deg. C: ±0.12hPa and ±1.0m
• LCC8 Package: Lead-Free Ceramic Carrier Package (LCC)
• High precision: 0.06hPa (0.5m) resolution in low power mode, 0.2Pa (1.7cm) resolution in high linear mode temperature output
• 12C interface, SPI interface temperature compensation
• Temperature compensation
• Size: 1.5cmx 1.15cm
• Low power consumption: 2.7uA
• Peak current: 1.12mA
• No external clock circuit required

Applications:

• Get more precise temperature, atmospheric pressure values, and approximate altitude data
• Enhancement of GPS navigation (e.g. time-tofirst-fix improvement, dead-reckoning, slope detection)
• Indoor navigation (floor detection, elevator detection)
• Outdoor navigation, leisure and sports applications
• Weather forecast
• Health care applications (e.g. spirometry)
• Vertical velocity indication (e.g. rise/sink speed)

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!