[simpits-tech] 32 channel input matrix board..

[geneb]

Here you go!

http://www.geneb.org/projects/input/32ch-board-gerbers.zip
http://www.geneb.org/projects/input/32ch-board.zip
http://www.geneb.org/projects/input/32ch-board.bmp

The board design tested out and it works great.  You can use 1N4148 diodes 
in it.

Here's some demo code that will work with it - You need to tweak the 
LIST_MAX field in the Keypad library if you're going to use big input 
matrices.
// This example only uses a small 3x2 matrix.  A standard Arduino Uno should
// be able to work with up to an 8 by 10 matrix.

#if LIST_MAX != 128
#error You need to modify the LIST_MAX constant in Keypad.h to be 128.
#error LIST_MAX
#endif
const byte ROWS = 3; // three rows const byte
COLS = 2; // two columns
byte switches[ROWS][COLS];
byte rowPins[ROWS] = {4, 3, 2}; //connect to the row pinouts of the input matrix
byte colPins[COLS] = {7, 6}; //connect to the column pinouts of the input matrix
Keypad keypad = Keypad( makeKeymap(switches), rowPins, colPins, ROWS, COLS );
String msg = "";
void setup(){
     byte row;
     byte col;
     byte switch_num = 1;
     Serial.begin(9600);
     keypad = Keypad( makeKeymap(switches), rowPins, colPins, ROWS, COLS );
     keypad.setDebounceTime(1);

     Serial.print("LIST_MAX is ");
     Serial.println(LIST_MAX, DEC);


     for(row = 0; row < ROWS; row++) {
         for(col = 0; col < COLS; col++) {
             switches[row][col] = switch_num;
             switch_num++;
         }
     }

     Serial.println("Ready.");

} void loop(){
     if (keypad.getKeys()) {
         for(int i = 0; i < LIST_MAX; i++) {
             if (keypad.key[i].stateChanged) {
                 switch (keypad.key[i].kstate) {
                 case PRESSED:
                     msg = " On.";
                     break;
                 case HOLD:
                 case IDLE:
                     msg = "";
                     break;
                 case RELEASED:
                     msg = " Off.";
                     break;

                 }
                 if (!msg.equals("")) {
                     Serial.print("Switch ");
                     Serial.print(keypad.key[i].kchar, DEC);
                     Serial.println(msg);
                 }
             }
         }
     }
}