smart-energy-monitor/software/firmware/shelly-monitor/README.md

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# Shelly Plug
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Shelly Plugs are quite cheap but relatively accurate to measure power consumptions less than 2.5 kW.
## Using Shellies Firmware
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If you already have a sheyll device, you can locate it in your network.
![Web interface](./docs/images/shelly1.png "web interace")
MQTT can be enabled under "ADVANCED - DEVELOPER SETTINGS" -> "MQTT".
![MQTT](./docs/images/shelly2.png "mqtt2")
Then it will post a message on boot to your MQTT server:
```json
{
"wifi_sta": {
"connected": true,
"ssid": "Guest",
"ip": "192.168.2.150",
"rssi": -43
},
"cloud": {
"enabled": false,
"connected": false
},
"mqtt": {
"connected": true
},
"time": "17:19",
"unixtime": 1676909964,
"serial": 1,
"has_update": false,
"mac": "4022D8891E97",
"cfg_changed_cnt": 0,
"actions_stats": {
"skipped": 0
},
"relays": [
{
"ison": true,
"has_timer": false,
"timer_started": 0,
"timer_duration": 0,
"timer_remaining": 0,
"overpower": false,
"source": "input"
}
],
"meters": [
{
"power": 117.46,
"overpower": 0,
"is_valid": true,
"timestamp": 1676913564,
"counters": [
0,
0,
0
],
"total": 0
}
],
"temperature": 0,
"overtemperature": false,
"tmp": {
"tC": 0,
"tF": 32,
"is_valid": true
},
"update": {
"status": "unknown",
"has_update": false,
"new_version": "",
"old_version": "20230109-114426/v1.12.2-g32055ee"
},
"ram_total": 52064,
"ram_free": 39744,
"fs_size": 233681,
"fs_free": 166664,
"uptime": 5
}
```
You an use shelly script to update this status periodically.
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A documentation on how to do this can be found on [Shellie's documentation](https://shelly-api-docs.shelly.cloud/gen2/ComponentsAndServices/Mqtt/).
## Flash Tasmota
There's an OpenSource project to flash Tasmota on Shelly Plug S': [mg2x](https://github.com/arendst/mgos-to-tasmota)
> Danger: This is still not working.
Locate your Shellie's IP adress (here: 192.168.2.150) and update it "over the air" with the Tasmota firmware:
http://192.168.2.150/ota?url=http://ota.tasmota.com/tasmota/shelly/mg2tasmota-ShellyPlugS.zip
Your shelly will return something like a JSON object that looks like that:
```
{
"status": "updating",
"has_update": false,
"new_version": "20230109-114426/v1.12.2-g32055ee",
"old_version": "20230109-114426/v1.12.2-g32055ee"
}
```
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After a while your Shelly Plug S should be flashed with Tasmota firmware.
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> Just be patient. This took longer than five minutes in my DSL connected network.
It will create create a new Wifi.
![Tasmota Wifi](./docs/images/wifi.png)
Join that Wifi and [configure the device)(http://192.164.4.1/).
![Join Wifi](./docs/images/configure-wifi.png)
You can configure it a a BlitzWolf SHP product.
Then it offers you power measurement and a programmable toogle.
![BlitzWolf](./docs/images/blitzwolf.png)
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It should be configurable just like our [plant monitor](../plant-monitor/README.md).
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Just enable MQTT and enter a shorter telemetry period.
![MQTT](./docs/images/mqtt.png) ![Telemetry period](./docs/images/telemetry-period.png)
It will post MQTT messages unter a topic `tele/tasmota_891E97/SENSOR` like this one:
```
{
"Time": "2023-02-27T16:45:07",
"ENERGY": {
"TotalStartTime": "2023-02-27T16:33:06",
"Total": 0.004,
"Yesterday": 0,
"Today": 0.004,
"Period": 0,
"Power": 34,
"ApparentPower": 44,
"ReactivePower": 27,
"Factor": 0.79,
"Voltage": 253,
"Current": 0.172
}
}
```
We now can consume this messages in Node-RED and post them into InfluxDB and build a dashboard in Grafana.
### InfluxDB Bucket
I created a bucket called `Shelly`in InfluxDB, so we can store the messages in this bucket.
### Node-RED
I create a usual flow in Node-RED. A MQTT node fetches the values.
![Node-RED](./docs/images/node-red.png)
The message is fed into a filter function to filter usefull information:
```
return {
payload: {
power: Number(msg.payload.ENERGY.Power),
volate: Number(msg.payload.ENERGY.Voltage),
current: Number(msg.payload.ENERGY.Current)
}
};
````
The `payload` will be stored in InfluxDB in the bucket "shelly".
### InfluxDB Data Explorer
In Influx DB Data Explorer you can query the stored data.
![Data Explorer](./docs/images/data-explorer.png)
The query created by Data Explorer look like that:
```
from(bucket: "shelly")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "msg")
|> filter(fn: (r) => r["_field"] == "power" or r["_field"] == "volate" or r["_field"] == "current")
|> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
|> yield(name: "mean")
```
### Grafana
Using this query you can crate a dashboard in Grafana.
![Grafana](./docs/images/grafana.png)