i just bought a revolt revolt SF-436 (NC-5461) energy monitor for €14 that communicates with 433 mhz and can be decoded by a 433-receiver like the rfxtrx. the NC-5461 is available at amazon germany, too.
my rfxtrx came with a ext2 firmware, but only the type2 firmware can decode it. so i had to flash my rfxtrx with that firmware. also the pyRFXtrx library couldn’t decode the ELEC5 packets the rfxtrx sends, so i had to write that module. it should be part of the next home assistant release.
after both the rfxtrx and home-assistant understoond the NC-5461 i could just follow @rpitera’s lead and add his automation suggestion.
# input boolean
input_boolean:
waschmaschine_status:
name: Status Waschmaschine
initial: off
# sensor
sensor:
platform: template
washer_pwrdn:
value_template: "{{ states('sensor.revolt_1_watt') | int < 3.4 }}"
# automation start
automation:
- alias: 'Waschmaschine Start'
trigger:
platform: state
entity_id: sensor.washer_pwrdn
from: 'True'
to: 'False'
action:
service: input_boolean.turn_on
entity_id: input_boolean.waschmaschine_status
# automation fertig
- alias: 'Waschmaschine fertig'
trigger:
platform: state
entity_id: sensor.washer_pwrdn
from: 'False'
to: 'True'
for:
minutes: 4
condition:
condition: state
entity_id: input_boolean.waschmaschine_status
state: 'on'
action:
- service: notify.notify
data:
message: 'Waschmaschine ist fertig!'
- service: shell_command.play_bike_horn
- service: input_boolean.turn_off
entity_id: input_boolean.waschmaschine_status
this seems to work pretty well, since the energy consumption of the washing machine is never zero longer than 2 minutes. if there’s no energy consumption longer than 4 minutes, it’s done. though there might be small amounts of energy consumption when the machine is on standby, the monitor reports zero watts.
