GUIDE - NRF5 / NRF51 / NRF52 for beginners

[NeverDie]

Reporting back: I did the measurements, and it takes an nRF52805 about 750uSec to go from cold-start to turning on an LED, at an average current drain of about 330ua just prior to the LED turning on. Of course, the 805 may have to spend additional time and current to re-establish a particular context, but ignoring that, the measurements suggest a breakeven point between cold-start vs sleeping with the RTC turned-on and full memory retained (roughly 1.5ua current draw) is approximately 200ms. The downside is that it would require additional hardware to benefit from the arbitrage, but if so desired it could be done. In fact, just knowing that's it's possible makes me want to try it! :sunglasses:

[NeverDie]

@ncollins Impressive! Looks as though you even modeled the exact shape of the coincell holder. And you apparently designed the 3D printer snap enclosures as well. Even just the 3D printed enclosure modelling is quite a task all by itself. I hope to one day evolve into doing that too, but for now the Hammond enclosures are going to be my short-term solution. The smallest Hammond is still not as small as what you've managed to produce, but at 36mm wide for an off-the-shelf ABS enclosure, it's too wide by only about 10mm. Still.... one day I want to 3D print an enclosure to be as small as possible.