[PLUG] Raspberry Pi portable UPS and speaker

[Arun Khan]

On Tue, Nov 10, 2020 at 9:52 AM Mayuresh <mayuresh at acm.org> wrote:
>
> Seek suggestions for the following accessories to RPI2:
>
> 1. Basic audio (speakers, mic), very compact so as to not occupy much
> space.
>

Perhaps a monitor with integrated speakers and mic?
OR
Search "computer speakers with microphone" on Amazon/Flipkart -- many
of them are BlueTooth.

> 2. Basic UPS. Purpose is to just last till a clean shutdown in case of
> power failure. Should be a way to signal power failure to Pi so that it
> shuts itself down.
>
> Read about super capacitor UPS which looks nice for the above purpose, but
> most articles are DYI. Are there ready to use devices based on these
> ideas?

I haven't mucked around with UPSs for a while (> 5 years).  I recall
some of the APC models came with a "special" cable that hooked into a
USB port of the computer.
And the "apcupsd - APC UPS Power Management (daemon)" worked very well
with it.
Make sure the daemon package is available for the ARM platform.
You will still need to tell the daemon which USB port to monitor.
DIY -- generic brands provide regular DB9 serial port and you will
need to build yourself a serial cable to hook up on the relevant GPIO
pins.

HTH.

-- 
Arun Khan (অরুণ খান্/अरुण खान)
"If you do not come out of your shell, you are just a nut."  Sadhguru