4x4 MATRIX KEYPAD / MEMBRANE KEYBOARD - Arduino tutorial #26

[@nishantrishinair854]

thanks for the tutorial, this really helped.

[@BasonTech]

Great to hear, thanks! 😃

[@lobotomia_666]

how can i take in output two numbers instead of only one??

[@BasonTech]

You then have to check if the user presses a number and then release. Then you have to check for the second number. Keep in mind. that you also need a "clear" button and "confirm" button to make this work correctly. If someone wants to enter the number 8 then "confirm" tells you the user is done and not want to enter 80

[@eysaerkarababa4749]

I have a keypad that has these push buttons with 16 of them.
Their name goes from 1 to 16 .
Can I use the code but with numbers with 2 digits😊

[@BasonTech]

Hard to say without knowing which component it is. However if it uses the same technique it should work.

[@bobsmithy3103]

Just curious does the membrane keyboard support multiple keys being pressed at the same time (for a project I need 3-4 keys being pressed at the same time and I'm not sure if those membrane keypads allow for that)

[@BasonTech]

This probably won't work. At least not when two keys share the same wire.

[@tomscietvirs2379]

Hello!
do you know how can i make a 15x15 keypad matrix?
how to create a larger (hexaKey) table! there are not so many symbols on the keyboard and he does not allow me to type between two ('....')
for example ('1a')
does not support combination!

[@BasonTech]

15x15 are 225 buttons, which is quite large. However it should be possible. You then need than at least around 2x15 pins. The Arduino Mega has 54 pins, so that one should be working 😃

[@tomscietvirs2379]

@@BasonTech I have technically solved it. But I can't fix the code!
there will be no button on the computer keyboard!
char keys [ROWS] [COLS] = {// declare 2 dimensional array to map keys
{'1', '4', '7', '*', '+'},
{'2', '5', '8', '0', '-'},
{'3', '6', '9', '#', '/'},
{'A', 'B', 'C', 'D', '

[@BasonTech]

@@tomscietvirs2379 The array in the tutorial is a char array. This means you can only store a single character per position. If you want more you have to use another type of make a translation function which translates a number into a certain code which matches what you want. So this could be for example an array of bytes.

[@tomscietvirs2379]

@@BasonTech you probably know where to find a similar code!
I won't be able to write myself yet!
I don't know how to program so well yet.
And many thanks for the suggestions!

[@TheUnofficialMaker]

instead of numbers how about a programmers keypad to add { } ( ) etc without using shift key connected usb to laptop

[@BasonTech]

You can use a Arduino Pro Micro to do this. This Arduino can act as a keyboard, so you can send your own keystrokes when a button is pressed like {} or () 😃

[@alvaroarmando8404]

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[@kyriecastiel7489]

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[@raylandalton4555]

@Alvaro Armando yup, I have been using instaflixxer for years myself =)

[@rafaelmarquesribeiro1099]

Hi!
Is it possible to use your Arduino Code implemented in StandartFirmata?
Thanks!

[@BasonTech]

Probably. You have to use the Firmata library and combine it with the code I use 😃

[@rafaelmarquesribeiro1099]

@@BasonTech i already tried but was not successful.. im trying to use the notepad in node-red and i've already tryied more options that i can count.. i just started with arduino so my knowledge isn't the best :c

[@BasonTech]

If you don't have Arduino knowledge, I would recommend to start at the beginning. This will give you more insight in how to debug.