Run commands from a template switch

A template switch turns a binary sensor input into on/off automations. Here a shell binary sensor toggles the template switch, whose turn_on_action / turn_off_action drive entities on two different platforms - a gpio relay switch and a shell button - and track state in a global. The switch’s lambda reads that global back with globals.get, so its reported state always reflects the global.

ubihome:
  name: UbiHome Example

gpio:
  device: raspberryPi

shell:

globals:
  - id: light_on
    type: bool
    initial_value: false

switch:
  - platform: template
    name: 'Desk Light'
    id: desk_light
    lambda:
      globals.get: light_on
    turn_on_action:
      then:
        - switch.turn_on: relay
        - button.press: log_light_on
        - globals.set:
            id: light_on
            value: true
    turn_off_action:
      then:
        - switch.turn_off: relay
        - button.press: log_light_off
        - globals.set:
            id: light_on
            value: false
  - platform: gpio
    id: relay
    pin: 17

button:
  - platform: shell
    id: log_light_on
    command: 'echo on >> /tmp/desk_light.log'
  - platform: shell
    id: log_light_off
    command: 'echo off >> /tmp/desk_light.log'

binary_sensor:
  - platform: shell
    name: 'Desk Occupancy'
    id: desk_occupancy
    update_interval: 2s
    command: 'cat /tmp/desk_presence 2>/dev/null || echo false'
    on_press:
      then:
        - switch.turn_on: desk_light
    on_release:
      then:
        - switch.turn_off: desk_light

The relay switch and the two log_light_* buttons are configured with only an id (no name), so they stay internal - wired up for the template switch to drive, but not exposed as separate entities.