The BME280 can interface to a 5V Arduino with no issues, so long as it's powered from 3.3V and the pullup resistors on SDA and SCL are also powered from 3.3V. I don't know about the RFM69 though. I have yet to use one of those.
The BME280 can interface to a 5V Arduino with no issues, so long as it's powered from 3.3V and the pullup resistors on SDA and SCL are also powered from 3.3V. I don't know about the RFM69 though. I have yet to use one of those.