Our ‘love machine’ will use a Facebook app that identifies your partner (after requesting access from you) and then pulls out images of you tagged with your partner. Then those images are displayed to you in a browser (ideally set in kiosk mode) and the users heart rate will be taken on a heart rate sensor linked up to the serial port of the computer, so that once a certain heart rate is reached then the webcam on the computer will take a picture of the user! Making the Facebook app is no easy feat, and I know Gav, Will and Rebecca are working hard to get all the code working as it is currently a bit temperamental.
But the only other issue I can think of is the heart rate. When it comes to the heart rate, the average persons resting heart rate is between 60-90 bpm (some athletes have been known to get it down to 28 bpm!!). So as long as we take the resting heart rate before the user starts, we have a base to work from. As regardless of weather we get the heart monitor talking to the computer or have to manually monitor it we need to have a base rate to work from.