WHat is the deep sleep shield?

[lacaca]

This post is deleted!

[thinginnovations]

Obviously you didn't look hard enough: lhttps://docs.pycom.io/datasheets/boards/deepsleep/

It's right there in the docs

[tuftec]

Its a fudge to solve a design problem with earlier Pycom units.
Effectively it is another micro (i think a PIC) that responds to commands from the Pycom device to pull the power and reapply it again after a period of time or on some event.