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Shelly Plug (S)
Shelly Plugs S are quite cheap but relatively accurate to measure power consumptions less than 2.5 kW.
Flash Tasmota
There's an OpenSource project to flash Tasmota on Shelly Plugs: mg2x.
Locate your Shellie's IP adress (in my case: 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 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"
}
After a while your Shelly Plug S should be flashed with Tasmota firmware.
Just be patient. This took longer than five minutes in my DSL connected network.
The Shelly Plus S will create create a new Wifi.
Join that Wifi and configure the device: http://192.164.4.1/
You can configure it as a BlitzWolf SHP product.
Then it offers you power measurement and a programmable toogle.
It should be configurable just like our plant monitor.
Just enable MQTT and enter a shorter telemetry period.
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, store them in InfluxDB and build a dashboard in Grafana.
If you haven't deployed the IoT prototyping backend yet, check out our guide.