look for key UID in sqlite database
simple poller
do not redeclare the tags array
run a heartbeat while polling for tags
notes
check the tag
GPIO (untested)
some fixes, in theory this is correct but I have some issue with GPIO
the constants are not up-to-date for B+
refactoring gpio pulses
cast correctly
some notes
handle the relay too, refactor the teardown on interrupt
Merge branch 'master' of https://github.com/rambo/nfc_lock