need help with keypad matric and keyboard shorcuts

Projects General Guidance
1

hi, firs off all im new to programming :smiley:

made matrix keyboard 6x6
tested with arduino game controler skech so pins working and ok

byte rowPins[NUMROWS] = {4,3,2,5,6,7};
byte colPins[NUMCOLS] = {12,11,10,9,13};

now i want to asing every button on matrix as keyboard button like if i pres first button on matrix i get same like i pressed ctr+v on keyboard

anyone can suggest ant samples?

2

You can use a struct to define which keys need to be pressed when you press a key on the matrix. The below struct allows for a normal key and two modifiers (e.g. ctrl, alt).

// include keyboard functionality
#include <Keyboard.h>

// macro to calculate number of elements in an array
#define NUMELEMENTS(x) (sizeof(x) / sizeof(x[0]))

// struct for key and modifiers
struct KEY
{
  const uint8_t key;
  const uint8_t mod1;
  const uint8_t mod2;
};

In the above, I've also included a macro to count the number of elements in an array.

Next you can declare an array of those structs, one for each key of the keypad

KEY keys[] =
{
  {KEY_ESC, KEY_LEFT_CTRL, 0},  // invoke start menu
  {'v', KEY_LEFT_CTRL, 0},      // paste
};

Next you can write a function to send the keys; the below function takes a number as the index in the keys array.

/*
  send keys (e.g. <n>, <ctrl><v>, <ctrl><esc>) to PC
  In:
    index indicating which key combination to send
*/
void pressKey(uint8_t index)
{
  // safety precaution; connect A5 to GND to enable HID functionality
  if (digitalRead(A5) == HIGH)
  {
    Serial.println("HID functionality disabled");
    return;
  }
  // check if a valid index was passed
  if(index >= NUMELEMENTS(keys))
  {
    Serial.println("Invalid index");
    return;
  }

  if (keys[index].mod1 != 0)
  {
    Keyboard.press(keys[index].mod1);
  }
  if (keys[index].mod2 != 0)
  {
    Keyboard.press(keys[index].mod2);
  }
  Keyboard.press(keys[index].key);
  delay(100);
  Keyboard.releaseAll();
}

The code first checks if HID functionality is enabled and next checks (using the earlier defined macro) if it's a valid index. If both conditions are satisfied, it will press the required keys (0 for a modifier indicates that you will not send a modifier) and after a little while it will release the keys.

Next you can write your setup() and loop(). I've not implemented a keypad, I'll leave that to you; if you have a simple keypad with numbers 0..9, you can simply subtract '0' from the key that you read from the keypad and use that as the index.

void setup()
{
  Serial.begin(57600);
  while (!Serial);

  // A5 used to enable HID functionality
  pinMode(A5, INPUT_PULLUP);
  
  Keyboard.begin();
}

void loop()
{
  pressKey(0);
  delay(1000);
}

The above code will send every second opening and closing the start menu on a Windows system if you have wired A5 to ground.

NOTE
You need a board with native USB (e.g. Leonardo) or you need to hack an Uno or Mega (possibly needs some modificcations of the code, no idea). Tested on a Leonardo.

3

thanks for replay but the code is too complicate for my to finish it. :confused: :confused:
can you finish code and i can edit it to my needs.

what i what to reach is, each of matrix 6x6 key to do keyboards buttons for example

ctrl+alt+1
ctrl+alt+2
ctrl+alt+3
ctrl+alt+4
ctrl+alt+5
...
cctrl+alt+a
ctrl+alt+b
ctrl+alt+c

and so one... shortcuts do not mater i will change them later