SimonTay

I designed a very similar thing last year - although the intervalometer is inside the Bluetooth receiver, not the phone. So, you can set it running, and switch the phone off. Never took it to production though.

http://phooto.co.uk/ismart/iSMART/

http://simontaylor.wordpress.com/tag/camera/

:)

Sounds great, but I seriously worry how long the batteries will last. Raspberry Pi isn't exactly low power. Been working myself with a Bluetooth LE device that runs code and will run for over a year on a coin cell!