Pressure Temperature Sensor Module GY-BME280

Features:

• Low Power Consumption: Only 0.1µA in sleep mode, ideal for battery-powered devices.
• Adjustable Sampling: Operates at 1 Hz with 1.8–3.6µA consumption.
• Fast Humidity Response: Response time of ~1s for real-time tracking.
• High Precision: RMS noise of just 0.2 Pa for pressure measurements.
• Temperature Compensation: Offset of 1.5Pa/k ensures consistent pressure readings in varying temperatures.
• I2C Interface: Easy integration with microcontrollers via 2-wire I2C communication.

Operating Principle:

1. Sensing elements measure temperature, humidity, and pressure.
2. Signals converted to digital via high-resolution ADC.
3. Built-in compensation and calibration algorithms ensure accuracy.
4. Data is sent over I2C to a microcontroller.
5. Supports sleep, forced, and normal operating modes.

I2C Address Configuration:

Default I2C address: 0x77. Modify solder jumper to switch to 0x76.

Pinout:

• VCC: 3.3V – 5V power input
• GND: Ground
• SCL: I2C clock
• SDA: I2C data

Applications:

• Context-aware sensing (e.g., indoor presence)
• Health and wellness monitoring
• Home automation and HVAC control
• IoT weather stations
• Altitude tracking and GPS enhancement
• Vertical velocity measurement (e.g., drones)

Supported Boards:

Wiring Diagram:

Arduino Code Example:

#include "Wire.h"
#include "Adafruit_Sensor.h"
#include "Adafruit_BME280.h"

#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme;

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

void loop() {
  printTemperature();
  printPressure();
  printAltitude();
  printHumidity();
  delay(1000);
}

void printTemperature() {
  Serial.print("Temperature: ");
  Serial.print(bme.readTemperature());
  Serial.println(" *C");
}

void printPressure() {
  Serial.print("Pressure: ");
  Serial.print(bme.readPressure() / 100.0F);
  Serial.println(" hPa");
}

void printAltitude() {
  Serial.print("Approx. Altitude: ");
  Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
  Serial.println(" m");
}

void printHumidity() {
  Serial.print("Humidity: ");
  Serial.print(bme.readHumidity());
  Serial.println(" %");
}

Technical Specifications:

• Voltage: 1.8V–5V DC
• Humidity Range: 0–100%
• Pressure Range: 300–1100 hPa
• Temperature Range: -40°C to +85°C
• Accuracy: ±1°C (temp), ±3% (humidity), ±1 Pa (pressure)
• Communication: I2C up to 3.4MHz

Comparison with Other Sensors:

Resources:

• BME280 Datasheet
• Tutorial