Thank you for taking a look. I do this work in the open because I benefit greatly from interaction with the community.
One thing, I still have one feature to test and will come back to this thread (likely on Friday) to share the final tested schematics. I may have an issue with the circuit I (mis?)implemented from @rickkas7 . Should have a final result on the "Enable Sleep" then.
BTW, having an external Real Time Clock means that the Boron sleep environment is more complicated than for the Electron. I am working through these issues in this post:
Also, I plan to kick off a separate thread on building the ultimate watchdog timer. Coming soon.
Thanks and please let me know if you have any questions.
Chip