You may want to state which host device you are thinking of using too.
However, we encourage people to search the forum for possible parallel questions before asking the same or a similar question.
Please read the forum guidelines (especially Step 2)
https://community.particle.io/t/welcome-using-particle-forums-and-forum-etiquette
A simple search for "power BME280" could have turned up this thread
You may find your answer in there (or one of the other threads returned by this search).
If you then can't get to your answer you are welcome to specify what else you need.