Comments on: DIY 3×4 Keypad for the Arduino (includes Schematics )

By: Jayden Staus

Jayden Staus — Wed, 06 Dec 2023 16:32:50 +0000

Can you give a better picture for the connection points from the 3×4 keypad to the Arduino?

By: Rui Santos

Rui Santos — Wed, 22 Jul 2015 19:12:21 +0000

In reply to Samer Najia. You can't, because you wouldn't have enough pins in your Arduino to support that number of columns and rows. You could use an IC that can expand the number of ports of your Arduino (as Steve suggested in an earlier comment) to control more rows/columns with less Arduino pins.

By: Samer Najia

Samer Najia — Mon, 20 Jul 2015 17:48:41 +0000

Can you extend this along the same lines to accept an alpha-numeric keypad? Is the limit bound by rows and columns (for example, what we have now is 4 rows and 3 columns. Can we extend this to 15 columns, say, and 4 rows? Does that overwhelm the Arduino?

By: Rui Santos

Rui Santos — Thu, 09 Oct 2014 11:07:29 +0000

In reply to Gregor.

Hi Gregor.
You are definitely right.
You need to make several tries until you find how much time is needed for your iron to transfer the schematics to the PCB.
Thanks for trying my project.
Rui

By: Gregor

Gregor — Wed, 01 Oct 2014 14:37:00 +0000

Hello Rui,

after your tutorial and from the video JumperOneTV i did etched my first pcb. It is not so difficult, but I made serval tries with the hot iron and diffrent paper befor I got nice black stribes on the pcb.

greetings from Denmark
Gregor

By: Rui Santos

Rui Santos — Mon, 01 Sep 2014 09:41:44 +0000

In reply to Vladimir Stojanovic.

Hi Vladimir,
Thanks for your feedback!
This Arduino example works just fine with this keypad: instructables.com/id/Arduino-3-wire-Matrix-Keypad/

By: Vladimir Stojanovic

Vladimir Stojanovic — Thu, 21 Aug 2014 04:15:26 +0000

Dear Rui,
may I make a tiny suggestion, it would be nice to see an example of code how to use this great DIY keypad project in combination with Arduino…..
Cheers….
BTW keep up the great work!