The BIG Arduino MIDI controller thread

// The switch is on Arduino pin 10:
#define switchPin 10
// Middle C (MIDI note value 60) is the lowest note we'll play:
#define middleC 60
//  Indicator LED:
#define LEDpin 13

// Variables:
char note = 1;            // The MIDI note value to be played
int AnalogValue = 0;           // value from the analog input
int lastNotePlayed = 0;   // note turned on when you press the switch
int lastSwitchState = 0;  // state of the switch during previous time through the main loop
int currentSwitchState = 0;

void setup() {
 //  set the states of the I/O pins:
 pinMode(switchPin, INPUT);
 pinMode(LEDpin, OUTPUT);
 //  Set MIDI baud rate:
 Serial.begin(31250);
 blink(3);
}

void loop() {
 //  My potentiometer gave a range from 0 to 1023:
 AnalogValue = analogRead(0);
 //  convert to a range from 0 to 127:
 note = AnalogValue/8;
 currentSwitchState = digitalRead(switchPin);
 // Check to see that the switch is pressed:
 if (currentSwitchState == 1) {
   //  check to see that the switch wasn't pressed last time
   //  through the main loop:
   if (lastSwitchState == 0) {
     // set the note value based on the analog value, plus a couple octaves:
    // note = note + 60;
     // start a note playing:
     noteOn(0x90, note, 0x40);
     // save the note we played, so we can turn it off:
     lastNotePlayed = note;
     digitalWrite(LEDpin, HIGH);
   }
 }
   else {   // if the switch is not pressed:
   //  but the switch was pressed last time through the main loop:
   if (lastSwitchState == 1) {
     //  stop the last note played:
     noteOn(0x90, lastNotePlayed, 0x00);
     digitalWrite(LEDpin, LOW);
   }
}

 //  save the state of the switch for next time
 //  through the main loop:
 lastSwitchState = currentSwitchState;
}

//  plays a MIDI note.  Doesn't check to see that
//  cmd is greater than 127, or that data values are  less than 127:
void noteOn(char cmd, char data1, char data2) {
 Serial.print(cmd, BYTE);
 Serial.print(data1, BYTE);
 Serial.print(data2, BYTE);
}

// Blinks an LED 3 times
void blink(int howManyTimes) {
 int i;
 for (i=0; i< howManyTimes; i++) {
   
   digitalWrite(LEDpin, HIGH);
   delay(100);
   digitalWrite(LEDpin, LOW);
   delay(100);
 }
}