int piezzo = 5;
int data = 0;
int led = 10;


void setup() {
  pinMode(piezzo, INPUT);
  Serial.begin(31250);
  pinMode(led, OUTPUT);
}

void loop() {
  data = analogRead(piezzo)*10;

  if( data >= 20 ) {
    noteOn(0x90, 50, 0x45);
    digitalWrite(led, LOW);
    delay(50);
    noteOn(0x90, 50, 0x0);
    digitalWrite(led, HIGH);
  }
  Serial.println(data);
  delay(10);
}

void noteOn(char cmd, char data1, char data2) {
  Serial.print(cmd, BYTE);
  Serial.print(data1, BYTE);
  Serial.print(data2, BYTE);
}