M0 and BME 280 breakout

[kwalkerk]

I'm sorry ahead of time.  I know this is a basic question, but I just don't know the answer.

I've never soldered anything with castellations before.  Should I solder on the "side" of the two boards or use the thru holes?

Thanks,

Ken

[Felix]

The castellations are provided for the flattest most compact soldering. But this means they are permanently soldered, and not very easy removal.
Otherwise if you're prototyping/experimenting you can always just solder male/female headers and then you can remove the board easily.

[kwalkerk]

Thanks Felix!

I think do just that