forked from curious.bio/iot-backend
45 lines
1.8 KiB
Markdown
45 lines
1.8 KiB
Markdown
# Node-RED and InfluxDB
|
|
|
|
Already added to this project is [node-red-contrib-influxdb](https://flows.nodered.org/node/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](http://admin:adminadmin@localhost: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:
|
|
|
|
```JavaScript
|
|
msg.payload = Number(msg.payload)
|
|
return msg;
|
|
```
|
|
|
|
|
|
|
|
You can forward this message to InfluxDB.
|
|
|
|
|
|
|
|
The `URL`of our InfluxDB is `http://influxdb:8086`. In InfluxDB you have to create a `token` to connect: [Load Data -> API Tokens](http://localhost:8086/orgs/721027680173bf2f/load-data/tokens).
|
|
|
|
|
|
|
|
You can use this `token` to create a connection in Node-RED.
|
|
|
|
|
|
|
|
Then the measurements should be visible in [Influx Data Explorer](http://localhost:8086/orgs/721027680173bf2f/data-explorer?bucket=test).
|
|
|
|
|
|
|
|
As the data is now stored in Influx, [let's create a dashboard in Grafana](../../dashboard/README.md).
|
|
|
|
# Links
|
|
|
|
* [IoT Made Easy with Node-RED and InfluxDB](https://www.influxdata.com/blog/iot-easy-node-red-influxdb/)
|
|
* A great tutorial can be found at [microcontrollerlab.com](https://microcontrollerslab.com/esp32-mqtt-publish-multiple-sensor-readings-node-red/)
|
|
|
|
|
|
|