Documentation

// BME280 - Read temperature, humidity, and pressure
// Requires: Adafruit BME280 Library + Adafruit Unified Sensor

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

Adafruit_BME280 bme; // I2C

void setup() {
  Serial.begin(9600);
  while (!Serial);

  // 0x76 is default; try 0x77 if SDO is tied to VCC
  if (!bme.begin(0x76)) {
    Serial.println("Could not find BME280 sensor. Check wiring!");
    while (1);
  }
  Serial.println("BME280 ready.");
}

void loop() {
  Serial.print("Temp: ");
  Serial.print(bme.readTemperature());
  Serial.println(" *C");

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

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

  Serial.println();
  delay(1000);
}

// BME280 on ESP32 via I2C (GPIO21 SDA, GPIO22 SCL)
// Requires: Adafruit BME280 Library

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

Adafruit_BME280 bme;

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22); // SDA, SCL

  if (!bme.begin(0x76)) {
    Serial.println("BME280 not found. Check wiring/address.");
    while (1);
  }
  Serial.println("BME280 ready.");
}

void loop() {
  Serial.printf("Temp: %.2f C | Humidity: %.2f %% | Pressure: %.2f hPa\n",
                bme.readTemperature(),
                bme.readHumidity(),
                bme.readPressure() / 100.0F);
  delay(1000);
}

# BME280 on Raspberry Pi via I2C
# Install: pip install RPi.bme280 smbus2
# Enable I2C first: sudo raspi-config -> Interface Options -> I2C

import smbus2
import bme280
import time

port = 1           # I2C bus 1 on modern Pi
address = 0x76     # 0x77 if SDO is tied high
bus = smbus2.SMBus(port)

calibration_params = bme280.load_calibration_params(bus, address)

while True:
    data = bme280.sample(bus, address, calibration_params)
    print(f"Temp: {data.temperature:.2f} C")
    print(f"Humidity: {data.humidity:.2f} %")
    print(f"Pressure: {data.pressure:.2f} hPa")
    print("-" * 30)
    time.sleep(1)

# BME280 on Raspberry Pi Pico via I2C0 (GP0 SDA, GP1 SCL)
# Upload a bme280.py driver module to the Pico filesystem first.

from machine import Pin, I2C
import bme280
import time

i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=100000)
print("I2C scan:", [hex(d) for d in i2c.scan()])

sensor = bme280.BME280(i2c=i2c, address=0x76)

while True:
    t, p, h = sensor.read_compensated_data()
    print("Temp:    {:.2f} C".format(t / 100))
    print("Pressure: {:.2f} hPa".format(p / 25600))
    print("Humidity: {:.2f} %".format(h / 1024))
    print("-" * 30)
    time.sleep(1)