Entangled Lights: https://www.thingiverse.com/thing:4716398

esphome.yaml

substitutions:
  devicename: notify_1
  upper_devicename: "Notify 1"
  blink_duration: 10s
  twin: "notify_2"

esphome:
  name: $devicename
  platform: ESP8266
  board: nodemcuv2

packages:
  wifi: !include common/wifi.yaml
  device_base: !include common/basics.yaml

status_led:
  pin:
    number: D0
    inverted: True

switch:
  ## restart
  - platform: restart
    name: "$upper_devicename Restart"

  - platform: template
    name: "${devicename}_red"
    turn_on_action:
    - light.turn_off: light_1
    - light.turn_on:
        id: light_1
        brightness: 50%
        red: 100%
        green: 0%
        blue: 0%
        effect: "Breath"
    - delay: $blink_duration
    - light.turn_off: light_1

  - platform: template
    name: "${devicename}_green"
    turn_on_action:
    - light.turn_off: light_1
    - light.turn_on:
        id: light_1
        brightness: 50%
        red: 0%
        green: 100%
        blue: 0%
        effect: "Breath"
    - delay: $blink_duration
    - light.turn_off: light_1

  - platform: template
    name: "${devicename}_blue"
    turn_on_action:
    - light.turn_off: light_1
    - light.turn_on:
        id: light_1
        brightness: 50%
        red: 0%
        green: 0%
        blue: 100%
        effect: "Breath"
    - delay: $blink_duration
    - light.turn_off: light_1

binary_sensor:
  - platform: status
    name: "$upper_devicename System Status"

  - platform: gpio
    id: buttonRed
    pin:
      number: D5
    filters:
      - delayed_on: 100ms
    on_press:
      - light.turn_off: light_1
      - light.turn_on:
          id: light_1
          brightness: 50%
          red: 100%
          green: 0%
          blue: 0%
      - homeassistant.service:
          service: switch.turn_on
          data:
            entity_id: "switch.${twin}_red"
      - delay: 1s
      - light.turn_off: light_1

  - platform: gpio
    id: buttonGreen
    pin:
      number: D6
    filters:
      - delayed_on: 100ms
    on_press:
      - light.turn_off: light_1
      - light.turn_on:
          id: light_1
          brightness: 50%
          red: 0%
          green: 100%
          blue: 0%
      - homeassistant.service:
          service: switch.turn_on
          data:
            entity_id: "switch.${twin}_green"
      - delay: 1s
      - light.turn_off: light_1

  - platform: gpio
    id: buttonBlue
    pin:
      number: D7
    filters:
      - delayed_on: 100ms
    on_press:
      - light.turn_off: light_1
      - light.turn_on:
          id: light_1
          brightness: 50%
          red: 0%
          green: 0%
          blue: 100%
      - homeassistant.service:
          service: switch.turn_on
          data:
            entity_id: "switch.${twin}_blue"
      - delay: 1s
      - light.turn_off: light_1

sensor:
  - platform: uptime
    name: "$upper_devicename Uptime"

  - platform: wifi_signal
    name: "$upper_devicename WiFi Signal"
    update_interval: 15s

light:
  - platform: fastled_spi
    chipset: WS2801
    data_pin: D2
    clock_pin: D3
    num_leds: 4
    rgb_order: RBG
    name: "$upper_devicename Light"
    id: light_1
    effects:
      - automation:
          name: Breath
          sequence:
            - delay: 1s
            - light.dim_relative:
                id: light_1
                relative_brightness: 50%
                transition_length: 4s
            - delay: 1s
            - light.dim_relative:
                id: light_1
                relative_brightness: -50%
                transition_length: 4s