Check if the door of the fridge is open or not. Put in a Calliope mini into the fridge and let it measure the light intensity. When it's all dark, Calliope makes a little party for herself, when the door opens (and thus it gets light), it tells you to close the door.
Check if the door of the fridge is open.
When it's light, the door is open, Calliope says: Close the door!
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