cblavier
Hey there,
I want to build an embedded system with a very low energy footprint 
Ideally, coupled with a big power bank, it should run for weeks.
The system doesn’t need to run all day long, it only requires to be turned on a few minutes per day.
Do you think this is feasible?
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D4no0
Are you planning on using custom hardware or something hobby grade like a RPI?
cblavier
I’m open to any hardware supported by Elixir Nerves
hubertlepicki
Raspberry Pi even the W2 one will last days on normal powerbanks, not weeks. You’d have to turn it on and off to do whatever the work is required. Which may be the correct approach here anyway.
I’d look for a timer solution that could be plugged between powerbank and raspberry pi to turn it on/off whenever the work has to be done, and shut it down either by cutting power or the device would gracefully shut down on its own.
Another option would be something like Wake On Lan but I don’t know if recent RPis cupport it. Old ones did not.
gus
Hi @cblavier! Your post is really great timing - I have been working on developing hardware/Nerves software for just this problem! I’ll be releasing it here on the forum later this week (today/tomorrow). You can see some of the information on my BlueSky posts:
cblavier
It appears that none of the RPI models support Wake On LAN.
cblavier
Nice!
Looking forward to it
hubertlepicki
wow can I buy that HAT somewhere already?
D4no0
One of the potential solutions I know of is to use a MCU that has low energy cores, like ESP32.
Needlessly to say, you will have a great time programming using that ghetto assembler and you will have to add a mosfet or something similar to route power to your nerves device.
LostKobrakai
Iirc you might be able to use RTCs to schedule the machine being woken up some time in the future.
gus
I’m considering a group buy at some point in the future (around Q2 this year), if there’s enough interest
it’s all open source so you could also customize and/or order your own at a PCB manufacturer
If you need a product which is available right now, I’d recommend the PiJuice Zero, Witty Pi 4 Mini, or LiFePO4wered/Pi+. These all have on-board microcontrollers which control the power. For each of these you’d have to look into the CLI tools that they ship with and see if you can package them with Nerves or rewrite the communication protocol in Elixir