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byte MIDI_pitch[] = {60,62,63,65,67,69,71,72}; // value of MIDI pitch to associate with button
byte MIDI_velocity[] = {127,127,127,127,127,127,127,127}; // value of MIDI velocity to associate with button
byte MIDI_channel[] = {0,0,0,0,0,0,0,0}; // value of MIDI channel to associate with button

byte previous[8]; // place to store previous data byte for comparison
byte current;  // place to store current data byte for comparison

void setup() { // let's begin..
  Serial.begin(57600); // open serial port
  pinMode(2, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(3, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(4, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(5, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(6, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(7, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(8, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
  pinMode(9, INPUT); // set pin mode of button to input
  digitalWrite(2, HIGH); // activate internal Arduino resistor
} // end of the beginning

void loop() { // let's loop...
  for(int i = 0; i < 8; i++) {
  current = digitalRead(i+2); // read the current state of the button
  
  if(current != previous[i]) { // compare the current state of the button to previous state 
    previous[i] = current; // if it's change, store the current for future comparison
    Serial.write(0x90 + MIDI_channel[i]); // send MIDI status byte for note on event
    Serial.write(MIDI_pitch[i]); // send MIDI data byte for pitch component
    Serial.write((1 - current) * MIDI_velocity[i]); // send MIDI data byte for velocity component
  } // end if
  
  delay(10); // debounce
  }
} // end loop