Hacker News new | ask | show | jobs
by TeMPOraL 782 days ago
How to read that info from the sheet? Problem: I have my NodeMCU gizmo with sensors and stuff, that works while powered via USB charger. I want to make it portable and powered by AAA batteries. How do I do it? I feel that my nan would've had an easier time figuring out on her own what laptop to buy.
2 comments
stavros 782 days ago
Connect two AAA batteries to the 3v3 rail.
link
YugyDugan 782 days ago
That's not what it's designed for. That's like asking how to run your iPhone on AAAs.

The hobbyist solution would be to find some obscure product on AliExpress with a holder for 2xAAAs and a 5V boost regulator with a USB connector. It's janky and inefficient, but that'll power your board, or your iPhone.

The 'proper' solution would be to then take this prototype to an optimised design in your ECAD software of choice, integrating a AAA holder and choosing an appropriate regulator, and having some PCBs assembled.

I'm not sure what else you could want. If the latter sounds daunting to you, it would be very easy for even an inexperienced EE on Fiverr to whip up for you.

link