Theremino

1//In this project we create a theremin with two ultrasonic sensors, one  for volume and another for tone. We use the digital potentiometer X9C103P.
2/*                                                                                                                                                                                                                                               
3  * Potentiometer conecctions:
4 * 1 - INC - Arduino pin 2
5 * 2 - U/D - Arduino  pin 3
6 * 3 - VH  - 5V
7 * 4 - VSS - GND
8 * 5 - VW  - Output
9 * 6 - VL  - GND
10 * 7 - CS  - Arduino pin 4
11 * 8 - VCC - 5V
12 *
13 */
14//Note:  we include two libraries: NewPing and TonePlayer because if we use the library NewPing  with a tone function, the sketch doesnot compile. 
15#include <NewPing.h> 
16#include  <TonePlayer.h>
17#define MIN_DISTANCIA 35 
18TonePlayer tone1(TCCR1A, TCCR1B,  OCR1AH, OCR1AL, TCNT1H, TCNT1L); 
19
20NewPing sonar(10, 11, 35); //The first  and the second number are the pins of the sensor of volume, the third is the maximum  distance 
21
22// name pins for sensors and the potentiometer
23int echo = 12;                            
24int trigger = 13;
25int INC = 2;
26int UD = 3;
27int  distancia;
28int actual, anterior;
29// necessary variables
30unsigned long tiempoRespuesta;
31float  distancia2;
32float tono1;
33
34void setup() {
35// set all the pins 
36Serial.begin(9600);  //use of monitor serie for check the distance
37pinMode(trigger, OUTPUT); //Tone  sensor                    
38pinMode(echo, INPUT); //Tone sensor    
39pinMode(2,  OUTPUT); //Potentiometer
40pinMode(3, OUTPUT); //Potentiometer
41//pinMode (speaker,  OUTPUT);
42
43for(int j=0; j<90; j++){ //As we do not know in what value the potentiometer  is, we place the value at the minimum
44     decremento(); 
45  }  
46  
47}
48
49void  loop() {
50  
51  digitalWrite(trigger, HIGH);           
52  delayMicroseconds(10);   // Pulse of ten microseconds                      
53  digitalWrite(trigger,  LOW);                   
54  tiempoRespuesta = pulseIn(echo, HIGH);  // Echo of  the pulse
55  distancia2 = tiempoRespuesta/58;  //Calculation of the distance in  centimeters
56
57  if (distancia2 < MIN_DISTANCIA) { 
58  //Conversion of distance  into a value for a sound 
59  tono1 = 50.0*pow(2,(distancia2/12.0));  //pow alculates  the value of a number raised to a power
60  pinMode(9, OUTPUT);
61  tone1.tone(tono1);  //Generates the tone with the previous value (220 Hz) 
62  delay(10); 
63  }
64
65distancia  = sonar.ping_cm(); //Calculation of the distance in centimeters (with the library  NewPing)
66Serial.print(distancia); //Check the distance
67//Change the value  "distancia", to values that are useful for the rise and fall of the potentiometer
68actual  = map(distancia, 0, 35, 0, 200);
69
70//Compares the mapped values to raise or  lower the potentiometer
71if(actual > anterior){
72  for(int i = 0; i< (actual  - anterior); i++){
73  decremento();
74  }
75}
76
77else{
78  for(int i =  0; i <= (anterior - actual); i++)
79  {
80  aumento();
81  }
82}
83
84anterior  = actual; //The value is updated with each loop
85delay(1);
86
87  
88}
89
90//The  U/D input controls the direction of the wiper movement and whether the counter is  incremented or decremented
91//The INC input is negative-edge triggered. Toggling  INC will move the wiper and either increment or decrement the counter in the direction  indicated by the logic level on the U/D input.
92//The next two functions produce  these toggling in the two directions (increment, decrement)
93
94void aumento(){  //aumento == increment
95digitalWrite(UD, HIGH);
96digitalWrite(INC, LOW);
97digitalWrite(INC,  HIGH);
98delay(10);
99digitalWrite(INC, LOW);
100}
101
102void decremento(){ //decremento  == decrement
103digitalWrite(UD, LOW);
104digitalWrite(INC, LOW);
105digitalWrite(INC,  HIGH);
106delay(10);
107digitalWrite(INC, LOW);
108}
109