On Aug 19, 2018, at 3:31 PM, Glenn Ramsey <[email protected]> wrote: > > Hi, > > 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 [1], 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: https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsdev 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: https://github.com/networkupstools/nut/blob/v2.7.4/drivers/blazer_ser.c#L73 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 _______________________________________________ Nut-upsuser mailing list [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
