Knock Detecting Door Lock

Methods | march | April | May | June | | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | Identifying the Project | | | | | | | | | | | | | | | | | Research | | | | | | | | | | | | | | | | | Making the project Proposal and cost estimation | | | | | | | | | | | | | | | | | Design | | | | | | | | | | | | | | | | | Making Prototype | | | | | | | | | | | | | | | | | Implementation | | | | | | | | | | | | | | | | | Testing and Finish Project | | | | | | | | | | | | | | | | | Documentation | | | | | | | | | | | | | | | | |

Research
As mentioned in Introduction first we identified the need of a door locking system that reacts to knocking.
In our research period first we studied about how to get sound of knocking. Getting noise free sound, how to recognize patterns using suitable algorithms, connecting system with users mobile phone via internet, Arduino Programming are the thing we researched in this period in purpose of coming up with a better solution for the problem we identified.
Then we identified the most suitable way to reach our solution.

Design
The first design we came up with is to identify correct knock by identifying sound made at the knock. This is the design we came up to give that kind of solution.
In this first design we used a guitar pick-up(microphone used in guitars) as the microphone. We used it because it can be attached to wood, here to door so it only get the sound come along the timber without any noise. This microphone doesn’t accept any sound other than sound of knocking.

From microphone we get a current signal that is proportional to the energy of the sound wave received by the microphone.
Then this signal is send to the signal amplifier.
This circuit amplifies the weak signal from microphone so it can be used in processing.
Then the amplified signal is send