Comments on: Button Code – Single Button Code Entry System

By: Johan

Johan — Fri, 20 Jan 2012 12:09:05 +0000

This project is nice as an end project at the tech college. But no one singel Chinees will adopt it as apruduct in order to MAKE MONEY. The process of entering the code is long. Old people will forget while entering which digit they are at it going back from Windows to MS-Dos at key pad you remember the number just have to push here need to remeber the number -remember which digit you are at-and take care on timing9again old people problem).
I would Alan you are skilled guy move on to your next project !

By: Johann Uys

Johann Uys — Tue, 27 Sep 2011 12:19:55 +0000

Alan

This simple little encoder works like a charm.

Well done

By: Alan Parekh

Alan Parekh — Fri, 09 Sep 2011 20:19:00 +0000

Hi Amr,

There is really no way since it was not designed to interface with a full keypad.

By: Amr Megahed

Amr Megahed — Fri, 09 Sep 2011 20:16:14 +0000

Do you know how to converte this circuit to work with keypad?

By: Alan Parekh

Alan Parekh — Thu, 14 Jul 2011 18:13:31 +0000

This is the diode that is used (or anything similar).
http://alan-parekh.vstore.ca/1a-diode-p-68.html

By: Alan Parekh

Alan Parekh — Thu, 14 Jul 2011 18:11:56 +0000

Hi Amr,

The transistor is a generic NPN. Use the 2N2222 or the 2N3904, they are generic and will work fine.

Alan

By: Amr Megahed

Amr Megahed — Thu, 14 Jul 2011 08:00:35 +0000

Also I got a question Mr.Alan Parekh

You didn’t write to the diodes type ,,
Thanks for your help

By: Amr Megahed

Amr Megahed — Thu, 14 Jul 2011 07:57:30 +0000

I can’t find the transistor 2N4401 in my country,, can I replace with an other one?
What I found here:
2N2222 “NPN”
2N2905 “PNP”
2N2907 “PNP”
2N3773 “NPN”
2N3904 “NPN”
2N3906 “PNP” .
2N4391 “N-Channel JFET Switch Transistor”
2N4403 “PNP”
2N4871 “Unijunction”
2N5401 “PNP”
2N5551 “NPN”

Ohhh,,
Is your transistor NPN or PNP?

By: Electronics-Lab.com Blog » Blog Archive » Button Code – Single Button Code Entry System

Fri, 15 Oct 2010 12:51:58 +0000

[...] Code – Single Button Code Entry System – [Link] Tags: button, Code Filed in Control | 1 views No Comments [...]

By: Garage Door Code Opener - Hacked Gadgets - DIY Tech Blog

Garage Door Code Opener - Hacked Gadgets - DIY Tech Blog — Wed, 04 Aug 2010 04:19:58 +0000

[...] Many of us know Mike from his work at Hack a Day. I am honored that this design was inspired by my Button Code project! The project is based around a ATtiny13 microcontroller just because that is what he had laying [...]