4x4 matrix keypad data logger // Матрицу 4x4 клавиатура регистратор данных

tr3za

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What components is needed to buit a 4x4 keypad data logger. It must be small as possible to hide the circuit behind the 3 unused touch on 16 of the keypad.
Behind the others touch used (13) it's possible to hide the matrix keypad built with mini buttons interconnect by wire:
http://itp.nyu.edu/physcomp/uploads/midi/midi_001.jpg

The 4x4 matrix will be connected to the hardware data logger, small as possible.
There is an idea here, what do you think about it ?
http://www.edaboard.com/ftopic374582.html

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Какие компоненты необходимы для построено 4x4 клавиатура регистратора данных. Оно должно быть минимальным, чтобы скрыть схемы за 3 неиспользованных коснуться 16 части клавиатуры.
За другие использовали Touch (13) это возможно, чтобы скрыть клавиатуру построена матрица с мини кнопками Interconnect по проводам:
http://itp.nyu.edu/physcomp/uploads/midi/midi_001.jpg

4x4 матрица будет подключена к регистратору аппаратных данных, как можно меньше.
Существует идея здесь, что вы думаете об этом?
http://www.edaboard.com/ftopic374582.html
 

tri.helix

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It will work, but I'd suggest using a replacement part membrane for the atm. The idea is great, if you have limited electronics experience i'd suggest building it on an arduino.

I've successfully built a prototype of this using the following two parts:

08824-03-L_i_ma.jpg


NCR_ATM_Keyboard_Membrane.summ.jpg
 

tr3za

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it only need this arduino module and nothing more apart the matrix keypad?
About its connection with computer... how to do it? ... is it need something else like an usb module (http://www.robotshop.ca/module-seriel-usb-arduino-sfe-1.html) or it can be directly connected on usb port?
I also seen others module but i don't know if it can be use in place of the precedent module:
http://www.robotshop.ca/arduino-nan-v-3.html
or
http://www.sparkfun.com/commerce/product_info.php?products_id=9228
or
http://www.robotshop.ca/microcontroleur-arduino-mini.html
thanks
 

tri.helix

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If your just trying to make a keypad then yes, it can be made with the arduino and a membrane, the only other thing you would need to buy is some wires.

Please keep in mind your not go to end up with a product of the same quality as what a professional will sell you. If you were serious about this project you'd just hire an electronics engineer to design you a custom board for this situation and a membrane custom made to fit inside the false keypad overlay.

I don't recommend either of the modules you listed as they are larger then the one I linked to. To use the one I specified you will need to soldier some headers to the communications pins for programming and use a cable called a FTDI (i believe) cable for programming.

There are many support forums for the arduino that can help you get started with some basic projects to learn the hardware/code.

When you order keep in mind that their are 5v and 3.3v models, so you'll need to power them accordingly.

model info
http://www.arduino.cc/en/Main/ArduinoBoardProMini

headers
http://www.sparkfun.com/commerce/product_info.php?products_id=553

cable
http://www.adafruit.com/index.php?main_page=product_info&products_id=70



it only need this arduino module and nothing more apart the matrix keypad?
About its connection with computer... how to do it? ... is it need something else like an usb module (http://www.robotshop.ca/module-seriel-usb-arduino-sfe-1.html) or it can be directly connected on usb port?
I also seen others module but i don't know if it can be use in place of the precedent module:
http://www.robotshop.ca/arduino-nan-v-3.html
or
http://www.sparkfun.com/commerce/product_info.php?products_id=9228
or
http://www.robotshop.ca/microcontroleur-arduino-mini.html
thanks
 
Last edited:

spid3r

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informative post.. +1 :)
 

tr3za

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yes... scaning keypresses but especially storing timestamped data on memory to recovered later on computer... Is it need to add an external memory or the internal one is enough?
I know there is 2 models (3,3 and 5v) ... so for this trick it's better to use a 3,3v (a small li-ion or li-po battery pack of 3,7v should go)
About connection with computer there is an exemple here:
http://www.arduino.cc/en/Guide/ArduinoProMini
You are wright, it's more simple to use the cable.
Finaly, if it needed only the arduino module and the matrix keypad to datalog... what about firmware source code?

ps: spid3r thanks for my first point so tri.helix deserves one too +1 :)
 

rickard

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Very informative, I hope simple me can make heads or tails with it, but I thank you guys, keep up the good work.
 
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