This tutorial presents how to visualize the power estimation computed by a formula on a grafana dashboard to obtain this kind of visualisation :
We will see how to connect a formula to a grafana instance, using InfluxDB. Then, we will see how to configure grafana to visualize the power estimation computed by the formula.
This tutorial assume that you know how launch a formula and a sensor to compute power estimation and that you have an InfluxDB and a grafana instance running on your local machine. The InfluxDB instance listen on port 1234 and Grafana instance listen on port 4321
Launch the formula with an InfluxDB Output
Launch the formula you want to connect and add the following parameter to the command line :
--output influxdb --uri localhost --port 1234 --db power_consumption --name grafana_output
Connect Grafana to the InfluxDB instance
Connect your web browser to your grafana instance and go to the “Data sources” section (in configuration part of the side bar)
Click on the “Add data source” button and select “InfluxDB”
Enter a data source name (here we choose “InfluxDB-1”), the instance URI (http://localhost:4321) and the database name (power_consumption) then click on the “Save and test” button.
Visualize the power consumption on a dashboard in real time
Go to the “Create Dashboard” section on the side bar to create a new dashboard
Click on the “add Query” button and write the following query on the Query field to request the power consumption values from the InfluxDB database :
SELECT power FROM "power_consumption"
To view the power consumption evolution in real time, you can change the range of the visualisation to
last 5 minutes and the refresh dashboard parameter to
5s. This parameters are on the top right corner of the UI