More accurate schematic and circuit diagram for electronic password door locking system

[Bhumin Shah]

hii,

 I am doing project of digital password door locking system but i coulnt fully understand the diagram given on this site…please give me more accurate diagarm for same c code published on this site i need it for my final year project

[AJISH ALFRED]

Hi,

Is this the circuit diagram that you are talking about

http://www.engineersgarage.com/node/4812?i=283

 

For me it looks neat and easily understandable. Have you tried this circuit before you say it is not accurate?

[Ashutosh Bhatt]

most of the things like description, circuit, program with comments will be given.

tell us what u dont understand?

[Bhumin Shah]

i dint understand if keybord will require 5v power supply or not….please tell me

 

[Ashutosh Bhatt]

i hv not seen the circuit but i will say you can connect keypad in two ways

in simple way you can directly connect rows and columns of keys to IO pins of device. no need to connect ground or supply.

in another way if you want to source or sink current when key is pressed throuch external source, you have to connect Vcc to keys

 

[Author]

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