@neverdie It's mostly because I haven't figured out how to appropriately, efficiently handle the wide voltage range of the 3722s.
In ambient light, they'd be perfect, but most locations in my house, there's a chance they'd get hit with direct sunlight. In a couple of my earlier prototypes, I fried the NRF module after the supercap exceeded 3.6v (damaged something that causes them to draw ~1-2ma).
In my case, I don't have a lot of artificial lighting, but I do decent direct/indirect sun from windows for at least part of the day.
- add a really efficient LDO between the 3722 and the super cap
- Sacrifice size compact size and jump up to 5.5v supercaps. Add LDO between the supercap and mote
- rig some kind of a pass through when vout < 3.6, else go through LDO
I'm mostly avoiding the issue by using the SC-3517s. A single cell wasn't really cutting it unless in direct sunlight, so I double up in parallel.
Bonus: other prototypes
Uses your boost charger
Testing out 50mF low ESR super cap