I recommend using the castellated pads to mount it, not pin header, if you need to use the 0.05" pins. The pins are not the same length! In the process of designing my project boards (background http://forum.espruino.com/conversations/265026/?offset=50 buy https://www.tindie.com/stores/DrAzzy/ ), this was recognized - only after the first run was in hand.
@DrAzzy started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I recommend using the castellated pads to mount it, not pin header, if you need to use the 0.05" pins. The pins are not the same length! In the process of designing my project boards (background http://forum.espruino.com/conversations/265026/?offset=50 buy https://www.tindie.com/stores/DrAzzy/ ), this was recognized - only after the first run was in hand.