Keyboard matrix with multiple key

Using Arduino Programming Questions
1

Good afternoon.

I need to make a keyboard with arduino leonardo and I am using matrix board.
In the table I need a multiple key like for example shift+insert.
does anyone know how i can do it

2

Welcome to the forum

Have you looked at the MultiKey example from the Keypad library ?

3

[quote="UKHeliBob, post:2, topic:1208253, full:true"]
Welcome to the forum

Have you looked at the MultiKey example from the Keypad library ?
[/quot

Thank you for your reply.
I have seen it but it only mentions pressing multiple buttons.
it does not mention them in a matrix

4

Really ?

Here are the first few lines of the sketch

|| @description
|| | The latest version, 3.0, of the keypad library supports up to 10
|| | active keys all being pressed at the same time. This sketch is an
|| | example of how you can get multiple key presses from a keypad or
|| | keyboard.
|| #
*/

#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the kpd
byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the kpd

Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
5

maybe I didn't ask the question well.

could we have multiple clicks on one button??

diladi in the table of the example instead of having the position 1 I had.

{'KEY_LEFT_SHIFT+KEY_INSERT ', '2', '3'},

6

You can only have a single character or byte value on a key but once you detect that key as having been pressed then it is up to you what you do in your sketch

7

are you telling me that I can make the matrix and as a hypothesis define that if 1 key is pressed, will be sent as an output KEY_LEFT_SHIFT +KEY_INSERT?

8

I am telling you that you can decide what to do whatever you like on receipt of any key, even though they keypad sends only a single character.

Some pseudo code

read key from keypad
if key equals 's'
  print "Mary had a little lamb"
else if key equals 't'
  turn on LED
else if key equals '#'
  send "rubbish" to the PC keyboard input
end if
9

Hi @dimtom

welcome to the arduino-forum.

If you explain with more details and if you provide more information much better suggestions taylored to your project can be made.

You should provide a picture how your matrix-board looks like
you should post a link to the datasheet of your matrix-board

You should describe to what kind of device you want to send "shift+insert" etc.
You should describe over what kind of interface you want to send "shift+insert" etc.

You should give an overview about your project and describe what the final purpose of sending keystrokes like "shift+insert" is.

best regards Stefan

10

Thank you very much, I will try it and get back to you

11

As @StefanL38 has suggested, if you tell us what you want to do it will be easier to provide help

From the fact that you have used 'KEY_LEFT_SHIFT+KEY_INSERT ' as your example it looks like you want to press a single key on the keypad and send keyboard commands to the PC. Is that what you are doing ?

By the way, 'KEY_LEFT_SHIFT+KEY_INSERT ' is meaningless anyway, because a pair of single quotes can only be used with a single character, not a multi character string or String

12

yes that is to i want. i need to press a single key on the keypad and sent keyboard commands to the pc double keys

13

Using something like the code in post #8 you can do whatever you like on receipt of a single keypad button press but, of course, you need to turn it into real code

14

when you can send me a complete code so that I can see the options with a 2x2 matrix and then I will do it in 7x7 that I want

15

Never

It is time for you to write some code. Have you looked at the Keypad library examples ?

16

ok.. i will see all the examples.

I will try to write the code.

and where I don't understand, correct me if you have time.

17

Start with HelloKeypad and adapt it

18

because I can't figure out how to do it with matrix if I do it with button combination with

void loop() {
  if while (digitalRead(2) == HIGH) && (digitalRead(3)==HIGH {

     delay(500);
   }
   delay(1000);
   Keyboard.press(ctrlKey);
   Keyboard.press('n');
   delay(100);
   Keyboard.releaseAll();
  
   delay(1000);
}

do you think it will work

19

Please make up your mind whether you want to press 2 buttons or 1 button in order to send multiple keypresses

Look again at the HelloKeypad example. Change

  if (key)

to

  if (key == '1')
{
  //put the code to be run when the user presses the '1' key here
}
20

i don't found that example