Keyboard scanner using Arduino Mega 2560 to reverse engineer Blackberry Passport Keyboard.

Scanner.c

/* Key scanner to reverse engineer Blackberry Passport keyboard pinout.
 * Coded By TinLethax (Can't remember the date, probably 2022/03/17).
*/
// https://tinlethax.wordpress.com/2022/03/20/reverse-engineering-blackberry-passport-keyboard-pinout-part-2/
// using Arduino Mega's pin 22 to 38
// I updated the Conversion array (from arduino pin to actual connector pin).
// I sacrificed the keyboard (by taking it apart and bought a new one). 
// to probe and get ~70% done with some left to probe with new kerboard (to replace the first one I took apart).
uint8_t toffcpin[16]={
  2, 3, 4, 5, 6, 7,
  17, 18, 19, 20, 21, 22,
  24, 25, 26, 27};// actual pinout of the connector.

void setup() {
  // put your setup code here, to run once:
  for (int i = 0; i < 16; i++) {
    pinMode(i + 22, INPUT_PULLUP);

  }
  Serial.begin(9600);
  Serial.println("Starting Keyboard scanner");
}

void loop() {
  // put your main code here, to run repeatedly:

  for (int i = 0; i < 16; i++) {
    for (int j = 0; j < 16; j++) {
      if ( j != i) {
        pinMode(j + 22, OUTPUT);
        digitalWrite(j + 22, LOW);
        //delay(5);
        if (!digitalRead(i + 22)) {
          Serial.print("found:");
          Serial.print(toffcpin[i]);
          Serial.print(",");
          Serial.println(toffcpin[j]);
        }

        pinMode(j + 22, INPUT_PULLUP);// set back to default as input pin

      } else
        pinMode(j + 22, INPUT_PULLUP);

      delay(5);
    }

  }

}