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