Beautiful dashboards for your home components, now with GPU and power usage
Hot on the heels of Monitoring Window’s system metrics with Grafana are two
fixes for the dashboard. Graphs about the GPU and power usage were missing from
the dashboard, but I’m happy to state that I’ve fixed this with the help from
Open Hardware Monitor, which is an open
source application/library for reading sensor data from computer components. I
was able to utilize this library to send this data into graphite to be
displayed on my grafana dashboards!
The plan is to create a simple Windows service that will run on boot and feed
data into graphite.
Open Hardware Monitor WMI
Open Hardware Monitor publishes all sensor data to
WMI, but since I’m not familiar
with WMI, it sounds like another layer of indirection from the hardware. I’d
also like to not run the application, which I’m presuming is what is required
to send to WMI. Not to mention I’d still need to write the code to export WMI
metrics to graphite. Since graphite has such a simple easy API for feeding data
into it, writing custom code will be the quickest way to see the data.
Open Hardware Monitor Library
I’ve mentioned that Open Hardware Monitor has a library, but did I mention that
library is out of date? To get the widest range of hardware compatibility,
we’ll need to work off the master
branch in the
source code. It’s inconvenient, but not a show stopper, as we’ll just need to
reference our local build in our code.
Open Hardware Monitor is great, but there are some holes. My Asus Z170 Pro
Gaming motherboard has zero sensors registered. There looks to be an
outstanding issue for
The following pull
shows fan speeds, but not much else. I suspect there must be other hardware
configurations where sensors are not detected, so user beware.
Once my motherboard support is added to the library I’ll be able to add panels
showing voltages, temperatures, and fan speeds across multiple components.
Since Open Hardware Monitor is written in C#, our service will also. Our code
uses some C# features, so some syntax may look new to C# veterans (I’m
certainly still getting used to it).
And can’t forget the bit of code that is used to install our service:
And the command to install.
If you want to run the code interactively, make sure to run it as administrator
for CPU power and temperature.
I’m calling the code “ohm-graphite”. It has the potential to be packaged as a
library or application for others, but since I’m still testing the waters (I
mean, I wrote the code in a couple hours). So for other graphite + grafana +
windows power users (and how many those are out there?), feel free to snag the
code under MIT.