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Here's how the notifications works:

If the levels are higher than the threshold sensed by the CO Sensor , it gives the following feedback:

  • The first time: gives audio tone and light indications as warning
  • 10 minutes after the first: if the levels are still high, it gives longer audio tone, a light indication and sends a friendly message asking the smoker to open windows.
  • 20 minutes after the first: if the levels are still high, it gives longer audio tone, a light indication and sends a message asking the smoker to open windows and spray room freshener.
  • 30 minutes after the first: if the levels are still high, it gives longer audio tone, a light indication and sends a message which warns the smoker to go outside the house and smoke.

Here's the schematic circuit board diagram and code:

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