Minidexed project Episode ?X? – Scanning an old synth keybed.

In this episode of the MiniDexed Build we will be begining to re-purpose an old M-Audio Oxygen 49 Midi keyboard. The Oxygen is just a keyboard controller and not a full synth. In this instance the unit was faulty so we are going to take it’s electronics and bin it ( mostly ) but re-purpose the keybed and key matrix. In order to turn this into a MIDI keybaord again, we need to understand how it’s wired. So in this video we will be using an arduion 2560 Mega to scan the keyboard and make up a table of the keys.

These works are based on the MiniDexed Project

The scanning was roughly based off this project

Watch the full video on Youtube.

//D14-D21 Output Pins
//A0-A15 (D54-69) Input Pins

int OPP[8] = {14,15,16,17,18,19,20,21};
int INP[16] = {54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69};
int x = 0 ;
int y = 0 ;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  //Set the pins in array OPP as OUTPUT
  //
  int x = 0;
  while ( x < 8 ) {
    pinMode(OPP[x], OUTPUT);
    digitalWrite(OPP[x], LOW);
    Serial.print("Pin Set Output > ");
    Serial.println(OPP[x]);
    x++;
  }
  //Set the pins in array IPP as INPUT_PULLUP  
    x = 0;
    while ( x < 16 ) {
    pinMode(INP[x], INPUT_PULLUP);
    Serial.print("Pin Set INPUT_PULLUP > ");
    Serial.println(INP[x]);
    x++;
  }

}

void loop() {
  x = 0;
  //Loop through Output Pins 1-8
  while ( x < 8 ) {
    digitalWrite(OPP[x], LOW);
    Serial.print("Pin Set Output > ");
    Serial.println(OPP[x]);
    y = 0;
     while ( y < 16 ) {
     // Loop through the input pins 1-16
     // If an input pin is Low ( Pressed )  
     if (digitalRead(INP[y]) == 0 )
      {
      // Print the X + Y values to the serial monitor  
      Serial.print("X=");
      Serial.print(x);
      Serial.print(" Y=");
      Serial.print(y);
      Serial.print(" Status ");
      Serial.println(digitalRead(INP[y]));
      delay(2000);
      
     }
    //Increment Y
    y++;
  }
  //delay(1000);
  digitalWrite(OPP[x], HIGH);
  // Increment X
  x++;
   }
 }