This experiment illustrates how to request the power value of the Wi-Fi energy meter (IAMMETER) from the modbus tcp sensor(Home assistant) in 1s/s (sample/second) and use this reading as the feedback value to control the SONOFF relay operate in real-time.
Compared to the IAMMETER`s integration in HA, the Modbus/tcp sensor in HA can request the data in 1 sec interval,this sample rate can do more interesting things.
The whole experiment effect is show in this video (the last 30 seconds of this video)
Request the data of energy meter in Home Assistant(Modbus/TCP) in 1s/s(sample/second) and trigger the Sonoff in real-time.
Home Assistant Setting
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Configuration the IAMMETER`s energy meter in Home Assistant
Single phase energy meter WEM3080: [modbusTCP in Home Assistant](https://github.com/lewei50/Solar-PV-Monitoring/blob/54bbbe2d858d3dc2b4b742cb89ef1b2687ff3cfc/Yaml in Home Assistant/ModbusTCP/modbus1.yaml)
Three phase energy meter WEM3080T: [modbusTCP in Home Assistant](https://github.com/lewei50/Solar-PV-Monitoring/blob/54bbbe2d858d3dc2b4b742cb89ef1b2687ff3cfc/Yaml in Home Assistant/ModbusTCP/modbus.yaml)
To use this sensor in your installation, add the following to your
configuration.yamlfile(for example WEM3080):Please remember to add ‘scan_interval: 1’ after ’ name: Modbus_Power’ to make home assistant to refresh the power reading every 1 second.
# Example configuration.yaml entry for multiple TCP connections modbus: - name: hub11 type: tcp host: 192.168.1.6 port: 502 sensors: - name: Modbus_Voltage slave: 1 address: 0 input_type: holding unit_of_measurement: V device_class: voltage state_class: measurement count: 1 scale: 0.01 offset: 0 precision: 1 data_type: uint16 - name: Modbus_Current slave: 1 address: 1 input_type: holding unit_of_measurement: A device_class: current state_class: measurement count: 1 scale: 0.01 offset: 0 precision: 1 data_type: uint16 - name: Modbus_Power slave: 1 address: 2 input_type: holding unit_of_measurement: W device_class: power state_class: measurement count: 2 scale: 1 offset: 0 precision: 0 data_type: int32 scan_interval: 1 - name: Modbus_ImportEnergy slave: 1 address: 4 input_type: holding unit_of_measurement: kWh device_class: energy state_class: total_increasing count: 2 scale: 0.0003125 offset: 0 precision: 3 data_type: uint32 - name: Modbus_ExportGrid slave: 1 address: 6 input_type: holding unit_of_measurement: kWh device_class: energy state_class: total_increasing count: 2 scale: 0.0003125 offset: 0 precision: 3 data_type: uint32 -
Add the opensource relay or the smart socket(Esphome, Tasmota,etc …) that supported in Home Assistant.
What we used in this experiment is the sonoff (S26 ). -
Add the Automations in Home Assistant:
when the power is greater than 1000, turn on Sonoff S26:
Power<500 then Turn off Sonoff S26:
The experiment effect
Use a Electric kettle to produce the load power.
At beginning ,the electric kettle is off,the load power is 0w, the sonoff smart socket is also off.
open the electric kettle, Modbus_Power=1596W > 1000W,then Sonoff S26 Relay turn on.
Ready to turn off the kettle.
The electric kettle is off , Modbus_Power=64W < 500W,the Sonoff S26 Relay turn off.
Use IAMMETER`s product in the Home assistant
1 Summary: How to use IAMMETER`s energy meter in Home assistant
2 Integrate the IAMMETER Wi-Fi energy meter(single phase and three-phase) into home assistant