Restore previous state after power failure - light

ESPHome
1

Hello,

I’m still new to both HA and ESPHome and I’m looking for a bit of help. I recently used tuya-cloudcutter to flash ESP on to some Merkury Innovation lights (MI-BW210-999WW) and have built a sunset/sunrise automation.

The lights are connected to a physical switch and sometimes they have been accidently switched off when the lights are on. When the switch is flipped back on, the lights reconnect but don’t turn back on. I have done some research seen “esp8266_restore_from_flash”, “on-boot” and “restore_mode” but none of them either make sense to me or completely answer my question.

Below is my yaml file for one of the lights. Any help is greatly appericated.

esphome:

  name: "driveway-light-right"

libretiny:

  board: generic-bk7231t-qfn32-tuya

  framework:

    version: dev

logger:

web_server:

captive_portal:

mdns:

api:

  password: !secret api_password

  encryption:  

    key: !secret api_encrypt_driveway-light-right

ota:

  password: !secret ota_password

wifi:

  ssid: !secret wifi_ssid

  password: !secret wifi_password

  ap:

  manual_ip:

    # Set this to the IP of the ESP

    static_ip: !secret ip_driveway-light-right

    # Set this to the IP address of the router. Often ends with .1

    gateway: !secret ip_gateway

    # The subnet of the network. 255.255.255.0 works for most home networks.

    subnet: !secret ip_subnet

button:

- platform: restart

  name: Restart

debug:

  update_interval: 30s

text_sensor:

- platform: debug

  reset_reason:

    name: Reset Reason

- platform: libretiny

  version:

    name: LibreTiny Version

sensor:

- platform: uptime

  name: Uptime

bp5758d:

  clock_pin: P8

  data_pin: P7

output:

- platform: bp5758d

  id: output_red

  channel: 3

  current: 29

- platform: bp5758d

  id: output_green

  channel: 2

  current: 29

- platform: bp5758d

  id: output_blue

  channel: 1

  current: 29

- platform: bp5758d

  id: output_cold

  channel: 5

  current: 65

light:

- platform: rgbw

  id: light_rgbw

  name: Light

  red: output_red

  green: output_green

  blue: output_blue

  white: output_cold
2

To start with a disclaimer: I am not familiar with libretiny or the lamp that you’re using. I’m therefore not sure if it has flash memory to store values which ‘survives’ a restart.

For a ‘regular’ ESP8266 or ESP32 you can make use of globals to store and restore values as follows:

esphome:
  #...
  on_boot:
    then:
      - light.control:
          id: my_light
          state: !lambda
            return id(last_light_state);

esp8266:
  board: ...
  restore_from_flash: true  # only needed for esp8266

globals:
  - id: last_light_state
    type: boolean
    restore_value: yes
    initial_value: 'false'

light:
  - platform: ...
    id: my_light
    on_turn_on:
      - globals.set:
          id: last_light_state
          value: 'true'
    on_turn_off:
      - globals.set:
          id: last_light_state
          value: 'false'

The restore_value tries to read value from the memory upon (re)start. The on_boot part sets the light state based on the last known state.

Finally, the light. Each time it’s switched on or off, would save the new state in the globals.

3

Didn’t seem like those worked. I’ll keep searching the documentation. Thanks for attempt!

4

It does work, but, the state of the light will only be stored in the flash memory after 1 minute because of this breaking change that will preserve your flash memory:
ESPHome 2023.4.0 - 19th April 2023

You can edit the write interval with this line:

preferences:
    flash_write_interval: example #(time in seconds e.g. 30s)