The mischievous whistling habit!!! What decent act has it done?? Calling pets, teasing women and using it as a secret code to attack on the enemy; what else has the whistle done? Cheering for favorite teams, partying up hard in the college, singing the melodious tunes, where else has the whistle been used? Most importantly, what has the whistle done for the geek?? Here it is!! Control any gadget you want with just whistle. Now there are ways like touch sensor, switches, keyboards, keypads, regulators etc. to operate various electronic gadgets; but a whistle is quite different compared to all these. The frequency at one whistles, intensity of whistle and it duration are usually different and hence it becomes very difficult to implement something which uses whistle as its controller. Read more to find out how is this possible and how can one make such gadget.