Some mornings I get up as soon as my alarm goes off, but other days I turn off the alarm and fall back to sleep. So I want to make and alarm clock which only goes off if I am still in bed. The time will be set 5-10mins after my normal alarm and ideally won't stop until I get out of bed.
Now the alarm clock aspect is relatively simple (RTC and a Buzzer) but the tricky bit is detecting there is someone in the bed. Load cells under the bed legs are the obvious choice, but that could get tricky to handle when my GF stays over. The other choice is I press a button when I get up to disarm the alarm, but that sort of defeats the point as:
1. I can simply turn it off without getting up
2. I want this to be automatic, otherwise I may as well use a regular alarm clock
Does anyone have any bright ideas on how to detect whether I am still in bed or not?