56 lines
1.6 KiB
Markdown
56 lines
1.6 KiB
Markdown
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# Shelly Plug (S)
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Shelly Plugs S are quite cheap but relatively accurate to measure power consumptions less than 2.5 kW.
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In our [smart-energy-montior](https://code.curious.bio/curious.bio/smart-energy-monitor) project we already have set up a Shelly using Tasmota, on Open Source alternative firmware, that also runs on various other consumer off the shelf devices.
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## InfluxDB Bucket
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In Influx I created a bucket called `shelly`in InfluxDB, so we can store the messages in this bucket.
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### Node-RED
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I create a usual flow in Node-RED. A MQTT node fetches the values.
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The message is fed into a filter function to only store usefull information:
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```
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return {
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payload: {
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power: Number(msg.payload.ENERGY.Power),
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voltage: Number(msg.payload.ENERGY.Voltage),
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current: Number(msg.payload.ENERGY.Current)
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}
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};
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````
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The `payload` will be stored in InfluxDB in the bucket "shelly".
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### InfluxDB Data Explorer
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In Influx DB Data Explorer you can query the stored data.
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The query created by Data Explorer looks like that:
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```
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from(bucket: "shelly")
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|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
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|> filter(fn: (r) => r["_measurement"] == "msg")
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|> filter(fn: (r) => r["_field"] == "power" or r["_field"] == "voltage" or r["_field"] == "current")
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|> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
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|> yield(name: "mean")
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```
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### Grafana
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Using this query you can crate a dashboard in Grafana.
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