and choose your Prometheus data source (Figure
L
). If you are not familiar with Prometheus query
language, you can click on the Metrics browser
and choose the metrics you want.
BUILDING YOUR SOURDOUGH JAR
Now comes the hands-on part. This is how
I mounted the electronics in my jar, but I’m
sure there is a much better way, so feel free to
improvise with what you have.
Take the lid from the jar and carefully make
two holes: one in the middle of the lid for the
ultrasonic sensor and another, smaller one next
to it for the DHT11.
Put the ultrasonic sensor in the HC-SR04
holder and glue it to the top of the lid. With
double-sided tape, stick the DHT11 to the lid so it
is facing down into the jar (Figure
M
).
Place the ESP32 board into the top of the
HC-SR04 holder (Figure
N
). You can also
carefully glue the board to the HC-SR04 holder
with a glue gun. Make sure that you are only
gluing to extended standoffs, not the board itself.
It should now look like Figure
O
. Just place
it in the kitchen (or wherever you keep your
sourdough starter) and plug it into the USB
charger. I added a cover from a cut-plastic bottle
to make sure the sourdough does not dry out
through the holes in the lid.
READING THE GRAPHS
Grafana data is going to tell you more about the
environment in which your sourdough starter is
growing and about the starter itself.
In your graphs, you can see the temperature
and humidity inside the jar, which might be
actually different from conditions in the room. The
warmer it is, the more often you have to feed your
sourdough.
Moreover, I use the graphs to evaluate the
height of the starter; when it has doubled in size
and then starts to shrink, I know it’s feeding
time (Figures
P
and
Q
). I even set up alerts in
Grafana that notify me when this happens.
I really hope you will try this out and let me
know how it went! Also, if you have some fun
and interesting IoT ideas, I would absolutely love
to hear about them! Just tweet to me at
@ivanahuckova.
L
M
N
O
P
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