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default card

How about an automatic switch to the default card after x minutes of inactivity.

Let the user define whatever the default card is and the timer amount and then if there is no activity for X minutes change to that card.

No activity for me would be no button presses, no movement in front of the sensor and depending on the card the normal action
For the media playing card it would be no media playing
For the timer card it would be no timer active

That would solve the issue that far too often the wrong card is shown due to a fly, a child or even a careless move too close to the sensor from me.