pic 16f88

neeteel35 · May 19, 2008

hello mates,
i am in a big trouble, i have a practical exam on wednesday and i have not been able to find out a solution to my case study. Well the question is as follows:
'You are the system developer for a small company who wants to upgrade their system security. They have looked at off the shelf security locks but what something unique. They want some kind of bio recognition, linked to a numeric keypad. Your system will receive a 32 bit binary number representing the individual’s thumb print. You need to compare this value against the keypad number entered. Currently there is no suggested length for the pin number although they currently have 27 employees.'

well i've tried to work it out and search for some solutions, but i am reching nowhere, and a pic 16f88 should be used in this ase study.

neeteel35 · May 19, 2008

i would be very greatful if someone can help me out

blueroomelectronics · May 19, 2008

Post what you've done so far.

joseph@e-tech · May 20, 2008

**broken link removed** that stuff may help you

Gordz · May 20, 2008

Hmmmm... not too much done so far it seems !

geko · May 20, 2008

Neeteel35 PM'd me a couple of days ago and this is some additional information he sent me which he might well have included in his post since, as I already pointed out to him, his query is far to vague to really help with.

well thanks for your reply, my knowledge is no so deep on this subject, but what i have been told is that instead of thinking of the finger print decoder, just think of a multiplexer sending inputs to the pic. But first of all a pin code is required from a 10 button keypad to open a registry. Then the person has to place his finger on the finger print decoder and the decoder sends this information to the pic where the information in the registry will be compared to the received data from the multiplexer.
The output can be a LED, if the code matches, the led light up and if not the led remain switched off.

briefly we can say that there are information already saved in a regisrty or memory. Each registry or memory has a code, so that it can be accesed. Inside these registry or memories there are data which will need to be compared to open the door.

Gordz · May 20, 2008

Ah ! that clarifies his query but it does not indicate how far he has got. Forum members are always keen to help but generaly reluctant (for obvious reasons) to do the project for whoever is asking the question. So, how far has neeteel35 got ?

geko · May 20, 2008

As far as this forum

Gordz · May 20, 2008

Then perhaps the lack of timeous effort has resulted in a fail....

neeteel35 · May 20, 2008

hello everyone

i've come up with a small block diagram attached, i presume i'll go with this one, i'm working on the coding of the keypad.....hopefully it may work.
what is known is that the inputs are multiplexed signals from both keypad and finger print decoder.

neeteel35 · May 20, 2008

well gentlemen,
today is the final day, i have not been to find the solution, i mean the coding or even an approximate coding for this problem, but what i think is that there should be a database, when the the user enter his pin code (4 digit, 16 bits), the pic micro will open the memory related to these bits, and in the concern memory there is the data of the finger print which can be 4,8 or 16 bits depending on the multiplexer. Then the data is compared and if it matches the door open.....
Wish me good luck folks.....lol
thanks for your comments and help
merci beaucoup les amis
a bientot.

blueroomelectronics · May 20, 2008

Good luck.

neeteel35 · May 21, 2008

cheers mate, i have 6hrs left, if someone can give me some coding relating this case please

blueroomelectronics · May 21, 2008

neeteel35 said:
cheers mate, i have 6hrs left, if someone can give me some coding relating this case please

At least you didn't leave it to the last minute.

futz · May 21, 2008

geko said:
Neeteel35 PM'd me a couple of days ago

Me too. I told him it sounded like an interesting project and encouraged him to get started right away.

blueroomelectronics · May 21, 2008

Hey no PM for me, I feel left out. Guess that's what I get for being a curmudgeon.
**broken link removed**

aljamri · May 21, 2008

neeteel35 said:
cheers mate, i have 6hrs left, if someone can give me some coding relating this case please

My friend is struggling for the last 3 months to do similar project. All what he achieved is to connect keypad and LCD, while you want to finish everything in six hours ?!!

blueroomelectronics · May 21, 2008

There's another recent thread here, a student wants us to do his assignment because they're too busy.

geko · May 21, 2008

I had this one a few months ago. They'd seen the up/down counter on my website. I've only put the HEX file for this project up there so this is what I got.

We are computer engineering 4th year students from Mindanao Polytechnic State College(Cagayan de Oro, Philippines). We have proposed a 4-digit presettable up/down counter but there is no available code. We would like to ask for the assembly source code.
We are hoping for your help. Thank you very much! God Bless

I declined to help

neeteel35 · May 21, 2008

yea i havent give up the idea to pursue this project, finally i have been able to build up the code for the keypad, now i am off for the finger print decoder, but can anybody tell me how to store data in a memory location, how to fetch that data and compare it to the input. Am i right that the pin code can open a memory???

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