Duty Cycle Sensor
The duty cycle sensor allows you to measure for what percentage of time a signal on a GPIO pin is HIGH or LOW.
For example, you can measure if a status LED of a pool controller is permanently active (indicating that the pump is on) or blinking.

# Example configuration entry
sensor:
  - platform: duty_cycle
    pin: D0
    name: Duty Cycle SensorConfiguration variables
- pin (Optional, Pin Schema): The pin to observe for the duty cycle. 
- update_interval (Optional, Time): The interval to check the sensor. Defaults to - 60s.
- id (Optional, ID): Set the ID of this sensor for use in lambdas. 
- All other options from Sensor.