Do you mean "never draws more than 200mA if using a 5V supply" ?
I was thinking of a Zero in gadget mode, booted from another Pi or PC so one did not need to use any SD Card which might shave a couple of mA off things. A USB connection would allow remote storage. But does it need any ?
I was thinking of media server, LAMP web server, SMB storage server, a "viable server" in a full sense, with at least hundreds of GBs. A "home automation server" would be a much easier task in a tight power budget.
I can agree with all that except "hundreds of GBs". I believe "however much space is left on an SD Card" would be good enough.
It's not a large disk capacity, but granted there are "server" applications that could function with far less. It all depends what the OP meant by "viable server" given the reference to historical " massive servers". You don't get many HD movies on what's left of an 8GB SD card, but it's far, far more than you need for a MQTT server.hippy wrote: ↑Thu Apr 25, 2019 7:36 pmI can agree with all that except "hundreds of GBs". I believe "however much space is left on an SD Card" would be good enough.
How to get hundreds GBs of storage consuming only 1W could be an additional but separate challenge.
Otherwise it won't be a level playing field challenge, would depend on what disk solution is found. If we discount the disk consumption, it doesn't actually matter how much there is only that there is some. And a lot of people won't even have a disk with hundreds of GB they can connect to their Pi or the means to do so.
That leaves it wide open. "Just works" and <1W could be something microcontroller based. ESP8266, Teensy, Onion, even a MicroBit.ankith26 wrote: ↑Fri Apr 26, 2019 4:52 amI would define a 'viable server' as something that just works!
All servers need not be massive, Just a simple pi for a simple server.
We need not think about storage, server speed, etc etc..
That would be overkill if @whiteshepherd had a simple requirement..
I would go about it in a simple way...
That's true, but the challenge does specify a Pi, not any of those.
With switchmode regulators you don't typically save power by reducing supply voltage. You may actually lose out as a lower voltage in will usually mean a higher average current draw and bit more loss in the wiring.hippy wrote: ↑Fri Apr 26, 2019 8:47 am
But I'm not convinced that executing software is where most power usage will be, though the less run the less stress there will be. I believe the big savings come from reducing hardware consumption. Hence running on a lower voltage, under-clocking, and turning peripherals off.
Thanks for reminding me of that. I am more used to using 5V chips powered directly from 5V supplies, where dropping the supply does massively reduce the current those chips use. I had neglected to take into account that most of the Pi chips are 3V3, supplied through reasonably efficient regulators from 5V.
Technically "Create a raspberry Pi server (like Pi 0/W) that runs on 1 watt or less power", is only a "like", but using a Zero or Zero W would be the obvious candidate as those draw least power to start with.
Or gadget mode and use a USB connection, both of which I suggested. But do either fit the challenge specification ? We don't know because there isn't a full specification.