NAME
pijuice - Driver for UPS in PiJuice HAT
SYNOPSIS
pijuice -h
pijuice -a UPS_NAME [OPTIONS]
Note
|
This man page only documents the hardware-specific features of the pijuice driver. For information about the core driver, see nutupsdrv(8). |
Note
|
This manual page was hastily adapted from related asem driver
man page based on information from the original pull request, and so
may not fully apply to PiJuice HAT, patches from experts are welcome. |
SUPPORTED HARDWARE
The pijuice driver supports the portable PiJuice HAT UPS for Raspberry Pi embedded PCs.
EXTRA ARGUMENTS
The required parameter for this driver is the I2C bus name:
- port=dev-node
-
On the PiJuice HAT, this should be
/dev/i2c-1
.NoteYou may want to add the driver run-time unprivileged user (e.g. nut
) to thei2c
group as a secondary group — typically in/etc/group
(along withpijuice
, if vendor CLI/GUI/automation packages are also installed), e.g.sudo usermod -a -G i2c nut
. Otherwise you may have to run the driver asroot
.
INSTALLATION
Note
|
This section was copied from asem driver man page and may not fully
apply to PiJuice HAT, patches are welcome. |
This driver is specific to the Linux I2C API, and requires the lm_sensors libi2c-dev or its equivalent to compile.
Beware that the SystemIO memory used by the I2C controller is reserved by ACPI.
If only a native I2C driver (e.g. i2c_i801
, as of 3.5.X Linux kernels) is
available, then you’ll need to relax the ACPI resources check. For example, you
can boot with the acpi_enforce_resources=lax
option.
KNOWN ISSUES AND BUGS
Note
|
This section was copied from asem driver man page and may not fully
apply to PiJuice HAT, patches are welcome. |
The driver shutdown function is not implemented, so other arrangements must be made to turn off the UPS.
The battery.current
and input.current
may be reported as negative, if it
is being charged and wall power is plugged into the Pi itself (not the HAT).
This reflects the direction of electric current over the GPIO pins; vendor
tools like pijuice_cli
or pijuice_gui
also show this. The reported
input.current
value was seen to fluctuate and even change the sign back
and forth as the battery.charge
value rose from zero into tens of percents
with this connectivity setup.
If the ups.date
and ups.time
look bogus, use vendor tools to set the RTC
clock of the HAT (check in Alarms section).
The battery.temperature
report may depend on capabilities of the actual
battery and methods used to poll it for information. Vendor tools provide
several settings for tuning this, but they don’t seem to impact what the
driver reports (pull requests welcome); bogus negative values were seen.
AUTHORS
Andrew Anderson <aander07@gmail.com>
SEE ALSO
The core driver:
Internet resources:
-
Initial pull requests adding this driver:
-
Product home page: https://uk.pi-supply.com/products/pijuice-standard
-
The NUT (Network UPS Tools) home page: https://www.networkupstools.org/