Hi guys!Please am a first yr electrical engineer in Ghana West Africa.For a competition,am trying to build a secret knock rhythm detector lock for a door.am looking for other cool features to help increase my chances of winning this competition.Thanks you guys in advance!

 

hi Danny,
Look at this link, its a very common project.

https://www.google.co.uk/search?q=d...firefox-a&gws_rd=cr&ei=rr_sUozwOsiqhAeTgYG4BA