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Digital timers
It would be neat if you could start a timer on a phone using it's camera and pointing it at an electronic device with a countdown on it.
1. Take a photo of a microwave
2. OCR photo
3. Wait 1s
4. Take a photo of a microwave
5. OCR photo
6. Compare the textual results of the two and start a timer based on that (e.g. 2:00 and 1:59 would indicate the timer should start counting down from 1:59 minutes)
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