Switch Binary Sensor
The Switch Binary Sensor platform allows you to view the state of any switch component as a read-only binary sensor.
# Example configuration entry
binary_sensor:
  - platform: switch
    name: "Output state"
    source_id: relay1
switch:
  - platform: gpio
    id: relay1
    pin: GPIOXXConfiguration variables
- source_id (Required, ID): The source switch to observe.
- All other options from Binary Sensor.