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Hmm, reminds me of a cup (given away with Coco Pops) which played a tune when it was raised... You could make your cup by modifying one of those as follows:
1) Add a timer
2) Change the circuit so that if it remains on the table for more than say 2 mins { => You've fogotten about it (very unlikely) or it's been left there 'cause it's empty!}, it plays a tune. |
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