Library __top__ Download | Adafruit_i2cdevice.h

If you download just the BME280 library, the Arduino IDE expects to find the chassis inside a folder called Adafruit_I2CDevice .

delay(1000);

void loop() // Example: Read a byte from register 0x00 uint8_t data; if (i2cDevice->read8(0x00, &data)) Serial.print("Read: "); Serial.println(data); else Serial.println("Read failed"); adafruit_i2cdevice.h library download