ITEAD Sonoff switches and sockets - cheap ESP8266 Wifi+MQTT hardware

Tutorials & Examples
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I got result with measurement of low power loading with Sonoff POW.
First I set EnergyRes to 5.
I took Total value with Teleperiod=60s and compare it with previous value. Measurement is very accurate with resolution below 1W (compare with Power W from teleperiod stats). Here is grafana setting for Total measurement.

5.png781×730 51.3 KB

And in rules i calculate consumed power fo 1 min:

var Number WashingMachine_Consumption = (ESP_SonoffPOW1_Total.state as Number 
          - ESP_SonoffPOW1_Total.historicState(now.minusMinutes(1)).state as Number) * 60 * 1000
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