Home assistant checking if internet connection is online

[aceindy]

@crc111

Is this a “sensor” entry in the configuration.yaml?

Yes

@crc111

What is the exact coding?

binary_sensor:
  - platform: ping
    name: Internet
    host: 8.8.8.8
    scan_interval: 15

@crc111

Then how do you use this to notify you that the ping failed?

You could send a notification to your phone, flash a light, TTS through speakers…endless possibilities