tv_state

binary_sensor:
  - platform: ping
    count: 5
    scan_interval: 10
    name: chromecast_status
    host: !secret chromecast_host

switch:
  - platform: template
    switches:
      tv:
        friendly_name: TV
        value_template: "{{ is_state('binary_sensor.chromecast_status', 'on') }}"
        turn_on:
          service: script.turn_on
          entity_id: script.tv_on_script
        turn_off:
          service: script.turn_on
          entity_id: script.tv_off_script