Problem with Matrix of 8x12

[Anonymous]

Hello,
I'am not so good in programming and want to connect a Bulls Matrix with 8x12. What characters are allowed for the var char? Only 8bit ASCII? Then I have a problem with the number of possible characters...
Thank you for answer.
Mike

[Mike Nagel]

Hello,
now I'am on sourceforge ;). After I spend a bit of time I will response myself to help some others.
To define the keymap I used the decimal value, this is much easier when you haven't the right keys on keyboard.

const byte numRows = 9;
const byte numCols = 12;
const int debounceTime = 100;

char keymap[numRows][numCols] = {
  {33,34,35,36,37,38,39,40,41,42,43,44},
  {45,46,47,48,49,50,51,52,53,54,55,56},
  {57,58,59,60,61,62,63,64,65,66,67,68},
  {69,70,71,72,73,74,75,76,77,78,79,80},
  {81,82,83,84,85,86,87,88,89,90,91,92},
  {93,94,95,96,97,98,99,100,101,102,103,104},
  {105,106,107,108,109,110,111,112,113,114,115,116},
  {117,118,119,120,121,122,123,124,125,126,128,129},
  {130,131,132,133,134,135,136,137,138,139,140,141}
};

byte rowPins[numRows] = {A0, A1, A2, A3, A4, A5, A6, A7, A8}; //connect to the row pinouts of the keypad
byte colPins[numCols] = {22, 24, 26, 28, 30, 32, 34, 36, 23, 25, 27, 29};

void setup()
{
  Serial.begin(9600);
  for (int row = 0; row < numRows; row++)
  {
    pinMode(rowPins[row],INPUT);       // Set row pins as input
    digitalWrite(rowPins[row],HIGH);   // turn on Pull-ups
  }
  for (int column = 0; column < numCols; column++)
  {
    pinMode(colPins[column],OUTPUT);     // Set column pins as outputs 
                                         // for writing
    digitalWrite(colPins[column],HIGH);  // Make all columns inactive
  }
}

void loop()
{
  char key = getKey();
  if( key != 0) {       // if the character is not 0 then 
                        // it's a valid key press
    /*Serial.print("Got key ");*/
    Serial.print(key);
  }
}

char getKey()
{
  char key = 0;
  for(int column = 0; column < numCols; column++)
  {
    digitalWrite(colPins[column],LOW);         // Activate the current column.
    for(int row = 0; row < numRows; row++)     // Scan all rows for 
                                               // a key press.
    {
      if(digitalRead(rowPins[row]) == LOW)     // Is a key pressed?
      {
        delay(debounceTime);                   // debounce
        while(digitalRead(rowPins[row]) == LOW)
            ;                                  // wait for key to be released
        key = keymap[row][column];             // Remember which key 
                                               // was pressed.
      }
    }
    digitalWrite(colPins[column],HIGH);     // De-activate the current column.
  }
  return key;  // returns the key pressed or 0 if none
}

The ninth Row is for future use of Buttons.

[poilou]

Great Job Mike :)

Make use of decimal values rocks and had never been done before !

Cheers :)

On 13/03/2019 16:25, Mike Nagel wrote:

Hello,
now I'am on sourceforge ;). After I spend a bit of time I will response myself to help some others.
To define the keymap I used the decimal value, this is much easier when you haven't the right keys on keyboard.
~~~
const byte numRows = 9;
const byte numCols = 12;
const int debounceTime = 100;

char keymap[numRows][numCols] = {
{33,34,35,36,37,38,39,40,41,42,43,44},
{45,46,47,48,49,50,51,52,53,54,55,56},
{57,58,59,60,61,62,63,64,65,66,67,68},
{69,70,71,72,73,74,75,76,77,78,79,80},
{81,82,83,84,85,86,87,88,89,90,91,92},
{93,94,95,96,97,98,99,100,101,102,103,104},
{105,106,107,108,109,110,111,112,113,114,115,116},
{117,118,119,120,121,122,123,124,125,126,128,129},
{130,131,132,133,134,135,136,137,138,139,140,141}
};

byte rowPins[numRows] = {A0, A1, A2, A3, A4, A5, A6, A7, A8}; //connect to the row pinouts of the keypad
byte colPins[numCols] = {22, 24, 26, 28, 30, 32, 34, 36, 23, 25, 27, 29};

void setup()
{
Serial.begin(9600);
for (int row = 0; row < numRows; row++)
{
pinMode(rowPins[row],INPUT); // Set row pins as input
digitalWrite(rowPins[row],HIGH); // turn on Pull-ups
}
for (int column = 0; column < numCols; column++)
{
pinMode(colPins[column],OUTPUT); // Set column pins as outputs
// for writing
digitalWrite(colPins[column],HIGH); // Make all columns inactive
}
}

void loop()
{
char key = getKey();
if( key != 0) { // if the character is not 0 then
// it's a valid key press
/Serial.print("Got key ");/
Serial.print(key);
}
}

char getKey()
{
char key = 0;
for(int column = 0; column < numCols; column++)
{
digitalWrite(colPins[column],LOW); // Activate the current column.
for(int row = 0; row < numRows; row++) // Scan all rows for
// a key press.
{
if(digitalRead(rowPins[row]) == LOW) // Is a key pressed?
{
delay(debounceTime); // debounce
while(digitalRead(rowPins[row]) == LOW)
; // wait for key to be released
key = keymap[row][column]; // Remember which key
// was pressed.
}
}
digitalWrite(colPins[column],HIGH); // De-activate the current column.
}
return key; // returns the key pressed or 0 if none
}

~~~
The ninth Row is for future use of Buttons.

---

Problem with Matrix of 8x12

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[diego]

hi,
what is your arduino board?

[Mike Nagel]

hi,
Mega 2560 R3
https://www.banggood.com/Mega-2560-R3-ATmega2560-16AU-Control-Board-Without-USB-Cable-For-Arduino-p-1044805.html?utm_design=41&utm_source=emarsys&utm_medium=Shipoutinform171129&utm_campaign=trigger-emarsys&utm_content=Winna&sc_src=email_2671705&sc_eh=2dad5650a047ff501&sc_llid=10696476&sc_lid=104858042&sc_uid=IadAavHT7X