ultrasonic theremin

int trigPin = 7;
int echoPin = 6;
int speakerPin = 8; 
long duration, cm, inches;
String scale;

#include <SPI.h>
#include "Adafruit_BLE_UART.h"

#define ADAFRUITBLE_REQ 10
#define ADAFRUITBLE_RDY 2
#define ADAFRUITBLE_RST 9

#define NOTE_B0  31  
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494

#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175


Adafruit_BLE_UART uart = Adafruit_BLE_UART(ADAFRUITBLE_REQ, ADAFRUITBLE_RDY, ADAFRUITBLE_RST);

void aciCallback(aci_evt_opcode_t event)
{ 
  switch(event)
  {
    case ACI_EVT_DEVICE_STARTED:
      Serial.println(F("Advertising started"));
      break;
    case ACI_EVT_CONNECTED:
      Serial.println(F("Connected!"));
      break;
    case ACI_EVT_DISCONNECTED:
      Serial.println(F("Disconnected or advertising timed out"));
      break;
    default:
      break;
  }
}

void rxCallback(uint8_t *buffer, uint8_t len)
{
  Serial.print(F("Received "));
  Serial.print(len);
  Serial.print(F(" bytes: "));
  for(int i=0; i<len; i++){
   Serial.print((char)buffer[i]);
   scale += (char)buffer[i];
  }
  Serial.print(F(" ["));

  for(int i=0; i<len; i++)
  {
    Serial.print(" 0x"); Serial.print((char)buffer[i], HEX); 
  }
  Serial.println(F(" ]"));

  /* Echo the same data back! */
  uart.write(buffer, len);
}

void setup(void)
{ 
  Serial.begin(9600);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  while(!Serial); // Leonardo/Micro should wait for serial init
  Serial.println(F("Adafruit Bluefruit Low Energy nRF8001 Callback Echo demo"));

  uart.setRXcallback(rxCallback);
  uart.setACIcallback(aciCallback);
  // uart.setDeviceName("NEWNAME"); /* 7 characters max! */
  uart.begin();
}
 
void loop()
{

  uart.pollACI();
  Serial.println(scale);
  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
 
  // Read the signal from the sensor: a HIGH pulse whose
  // duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
 
  // convert the time into a distance
  cm = (duration/2) / 29.1;
  inches = (duration/2) / 74; 

  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  //Serial.println();
  
  if(scale.equals("penta")){

  if (inches <= 1){
    tone(speakerPin, 1175);
  }
  else
  if (inches == 2){
    tone(speakerPin, 1047);
  }
  else
  if (inches == 3){
    tone(speakerPin, 880);
  }
  else
  if (inches == 4){
    tone(speakerPin, 784);
  }
  else
  if (inches == 5){
    tone(speakerPin, 698);
  }
  else
  if (inches == 6){
    tone(speakerPin, 587);
  }
  else
  if (inches == 7){
    tone(speakerPin, 523);
  }
  else
  if (inches == 8){
    tone(speakerPin, 440);
  }
  else
  if (inches == 9){
    tone(speakerPin, 392);
  }
  else
  if (inches == 10){
    tone(speakerPin, 349);
  }
  else
  if (inches == 11){
    tone(speakerPin, 294);
  }  
  else
  {
    noTone(speakerPin);
  } } 
  else
  {
  if (scale.equals("chrom")){
    
  if (inches <= 1){
    tone(speakerPin, 1175);
  }
  else
  if (inches == 2){
    tone(speakerPin, 1109);
  }
  else
  if (inches == 3){
    tone(speakerPin, 1047);
  }
  else
  if (inches == 4){
    tone(speakerPin, 988);
  }
  else
  if (inches == 5){
    tone(speakerPin, 932);
  }
  else
  if (inches == 6){
    tone(speakerPin, 880);
  }
  else
  if (inches == 7){
    tone(speakerPin, 831);
  }
  else
  if (inches == 8){
    tone(speakerPin, 784);
  }
  else
  if (inches == 9){
    tone(speakerPin, 740);
  }
  else
  if (inches == 10){
    tone(speakerPin, 698);
  }
  else
  if (inches == 11){
    tone(speakerPin, 659);
  }
  else
  if (inches == 12){
    tone(speakerPin, 622);
  }
  else
  if (inches == 13){
    tone(speakerPin, 587);
  }}
  else
  {
    noTone(speakerPin);
  } }
  delay(20);
  }