[Nut-upsuser] Protocol for an Arduino based UPS
clepple at gmail.com
Mon Aug 20 02:55:59 BST 2018
On Aug 19, 2018, at 3:31 PM, Glenn Ramsey <gr at componic.co.nz> wrote:
> I'm building a DIY UPS for a Raspberry Pi using a 12V SLA battery, charger, and
> an off the shelf 5V regulator. To monitor the battery level I'd like to use an
> Arduino or similar type device. Since the Arduino can have a serial over USB
> connection with the Pi I'd like to implement a protocol that can be used with NUT.
> Does anyone know if something like this has already been done? The only thing I
> could find was this , but it doesn't look like there is a NUT driver. Maybe
> I'm not searching with the right terms?
I'm at a loss for the right search terms, and I know we had someone considering building a USB/HID version of what you are talking about. If there was indeed another discussion, it would probably be on the nut-upsdev lists:
A related UPS project (but I think they ruled out Arduino-class processors early): https://gitlab.com/esr/upside/wikis/external-interface
> If I were implement a UPS protocol what would be the easiest one to implement
> that is already supported by NUT?
The Megatec/Q* protocols are fairly ubiquitous, so that might be where I would start.
You mentioned serial-over-USB - does the Arduino show up as a /dev/ttyUSB* node or similar on the Pi? The following assumes that it does.
blazer_ser has some test strings:
but development has been moved to nutdrv_qx, which is the preferred driver to test against (though it is a bit more comprehensive, and perhaps less clear at first glance).
Protocol documentation: https://networkupstools.org/protocols/megatec.html
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