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Node-RED and InfluxDB
Already added to this project is node-red-contrib-influxdb. You can use it's nodes to write and query data from an InfluxDB time series database. These nodes support both InfluxDB 1.x and InfluxDb 2.0 databases. At the time of this writing we are using version 2.6 of InfluxDB on port 8086.
In Node-RED we will be passing the power consumption number through MQTT.
By default this will be passed as a string, so we need to create a function to convert it into a Number before storing it in InfluxDB.
Add a function node to the page and put the following code into the node:
msg.payload = Number(msg.payload)
return msg;
You can forward this message to InfluxDB.
The URLof our InfluxDB is http://influxdb:8086. In InfluxDB you have to create a token to connect: Load Data -> API Tokens.
You can use this token to create a connection in Node-RED.
Then the measurements should be visible in Influx Data Explorer.
As the data is now stored in Influx, let's create a dashboard in Grafana.
Links
- IoT Made Easy with Node-RED and InfluxDB
- A great tutorial can be found at microcontrollerlab.com