Build the Opticalock (1):

Combination locks are useful because they can not be picked like a 'key' lock can. If a combination lock could sound an alarm before it was cracked', the odds of stumbling on the correct combination would be very slim. The trouble with combination locks is that they have preset/unchangeable combinations. Such combinations are a security risk, since the they may fall into the hands of the wrong people. So, how about creating a programmable combination lock system unlike any other in the world that is so innovative that practically nobody can crack the code?