[busymom0]

I had a similar deja vu because just few days ago I posted a comment asking similar tech:

> Other than raspberry pi, does anyone know of an even lower powered board which can run a very simply web server (only needs to return a single html file)? I have an idea for a fun hobby project where I want to connect my echo bike (for cardio) to the board which charges it everyday and returns an html with how much I charged it and daily cardio stats. Basically, if I don’t do cardio, then the board won’t be charged enough to keep the site up, so that gives me incentive to do it regularly.

https://news.ycombinator.com/item?id=29409339

[lstodd]

I ran a webserver of sorts on an STM32F767, a python one of all things.

200mA looks like about par for the course, ethernet and all.

[foxfluff]

What's the supply voltage? Do you have a breakdown of which parts of the board consume how much? I feel like one should be able to use way less than that, but there are plenty of ways to waste power on a board that isn't designed to be battery powered.

One project I've been thinking about recently (if I only I could find the time..) is to build a tiny server around a microcontroller coupled to a small NiMH pack (just standard AA/AAA rechargeable cells) and a small solar panel, running by the (not particularly well lit) window of my home office.

[lstodd]

3.3V, that's pretty standard nowadays.

I don't have a breakdown, it was cobbled together from whatever was around, an STM32 devboard, some regulators, some half-dead li-fe-pos, almost useless BMS from ali, this sort of stuff. Obviously that ate significantly less than an RPi, but I can't say how much, don't actually remember since that wasn't the problem.

Another take was a weather station, basically an ESP on a ~2500mAh 18650 li-ion.

That lived for like a week on a charge, stuff being fetched from it every minute over wifi.

I would recommend against using NiMH for that, just get some 18650s and work them between 80-40% charge, they'll last forever.