Play Music in the Air! | Arduino Air Piano Project

1#define ECHO_PIN 3       
2#define TRIGGER_PIN 4      
3
4#define LED_Do 13
5#define LED_Re 12
6#define LED_Mi 11 
7#define LED_Fa 10
8#define LED_Sol 9 
9#define LED_La 8 
10#define LED_Si 7  
11#define LED_Do_High 6 
12
13#define BUZZER_PIN 2
14
15unsigned long last_time_ultrasonic_trigger = millis(); 
16unsigned long ultrasonic_trigger_delay = 100; 
17
18volatile unsigned long pulse_in_begin;
19volatile unsigned long pulse_in_end;
20volatile bool new_distance_available = false;
21
22const int time_delay = 500;
23
24// 🎵 Notes (8 notes: Do Re Mi Fa Sol La Si Do)
25int notes[] = {
26  523,  // Do (C5)
27  587,  // Re (D5)
28  659,  // Mi (E5)
29  698,  // Fa (F5)
30  784,  // Sol (G5)
31  880,  // La (A5)
32  988,  // Si (B5)
33  1046  // Do (C6) 
34};
35
36// 🎵 SONGS
37int melody_mary[] = {
38  LED_Mi, LED_Re, LED_Do, LED_Re, LED_Mi, LED_Mi, LED_Mi,
39  LED_Re, LED_Re, LED_Re, LED_Mi, LED_Sol, LED_Sol, LED_Mi, LED_Re,
40  LED_Do, LED_Re, LED_Mi, LED_Mi, LED_Mi, LED_Re, LED_Re,
41  LED_Mi, LED_Re, LED_Do
42};
43int length_mary = sizeof(melody_mary) / sizeof(melody_mary[0]);
44
45int melody_twinkle[] = {
46  LED_Do, LED_Do, LED_Sol, LED_Sol, LED_La, LED_La, LED_Sol,
47  LED_Fa, LED_Fa, LED_Mi, LED_Mi, LED_Re, LED_Re, LED_Do,
48  LED_Sol, LED_Sol, LED_Fa, LED_Fa, LED_Mi, LED_Mi, LED_Re,
49  LED_Sol, LED_Sol, LED_Fa, LED_Fa, LED_Mi, LED_Mi, LED_Re,
50  LED_Do, LED_Do, LED_Sol, LED_Sol, LED_La, LED_La, LED_Sol,
51  LED_Fa, LED_Fa, LED_Mi, LED_Mi, LED_Re, LED_Re, LED_Do
52};
53int length_twinkle = sizeof(melody_twinkle) / sizeof(melody_twinkle[0]);
54
55int melody_bus[] = {
56  LED_Do, LED_Do, LED_Do, LED_Mi, LED_Sol,
57  LED_Mi, LED_Do, LED_Re, LED_Do, LED_Re,
58  LED_Sol, LED_Mi, LED_Do, LED_Do, LED_Do,
59  LED_Do, LED_Mi, LED_Sol, LED_Mi, LED_Do,
60  LED_Re, LED_Sol, LED_Do, LED_Do
61};
62int length_bus = sizeof(melody_bus) / sizeof(melody_bus[0]);
63
64int melody_yankee_doodle[] = {
65  LED_Fa, LED_Fa, LED_Sol, LED_La, LED_Fa, LED_La, LED_Sol,
66  LED_Fa, LED_Fa, LED_Sol, LED_La, LED_Fa, LED_Mi,
67  LED_Fa, LED_Fa, LED_Sol, LED_La, LED_Si, LED_La, LED_Sol,
68  LED_Fa, LED_Mi, LED_Do, LED_Re, LED_Mi, LED_Fa, LED_Fa
69};
70int length_yankee_doodle = sizeof(melody_yankee_doodle) / sizeof(melody_yankee_doodle[0]);
71
72int* current_melody = melody_mary;
73int current_melody_length = length_mary;
74
75int melody_tracker = 0;
76bool free_play_mode = false;
77
78void trigger_ultrasonic_sensor() {
79  digitalWrite(TRIGGER_PIN, LOW);  
80  delayMicroseconds(2);             
81  digitalWrite(TRIGGER_PIN, HIGH);  
82  delayMicroseconds(10);            
83  digitalWrite(TRIGGER_PIN, LOW);   
84}
85
86void echo_pin_interrupt() {
87  if (digitalRead(ECHO_PIN) == HIGH) {
88    pulse_in_begin = micros();
89  } else {
90    pulse_in_end = micros();
91    new_distance_available = true;
92  }
93}
94
95double get_distance() {
96  double duration_micros = pulse_in_end - pulse_in_begin;
97  return duration_micros / 58.0;
98}
99
100void turn_off_all_leds() {
101  digitalWrite(LED_Do, LOW);
102  digitalWrite(LED_Re, LOW);
103  digitalWrite(LED_Mi, LOW);
104  digitalWrite(LED_Fa, LOW);
105  digitalWrite(LED_Sol, LOW);
106  digitalWrite(LED_La, LOW);
107  digitalWrite(LED_Si, LOW);
108  digitalWrite(LED_Do_High, LOW);  // Turn off high Do
109}
110
111void setup() {
112  Serial.begin(115200);
113  pinMode(ECHO_PIN, INPUT);   
114  pinMode(TRIGGER_PIN, OUTPUT);
115  pinMode(LED_Do, OUTPUT);
116  pinMode(LED_Re, OUTPUT);
117  pinMode(LED_Mi, OUTPUT);
118  pinMode(LED_Fa, OUTPUT);
119  pinMode(LED_Sol, OUTPUT);
120  pinMode(LED_La, OUTPUT);
121  pinMode(LED_Si, OUTPUT);
122  pinMode(LED_Do_High, OUTPUT);  
123  pinMode(BUZZER_PIN, OUTPUT);
124
125  attachInterrupt(digitalPinToInterrupt(ECHO_PIN), echo_pin_interrupt, CHANGE);
126
127  Serial.println("🎶 Select a song to play:");
128  Serial.println("1 - Mary Had a Little Lamb");
129  Serial.println("2 - Twinkle Twinkle Little Star");
130  Serial.println("3 - The Wheels on the Bus");
131  Serial.println("4 - Yankee Doodle");
132  Serial.println("0 - Free play mode (Air Piano)");
133}
134
135void loop() {
136  unsigned long time_now = millis();
137
138  if (Serial.available() > 0) {
139    char input = Serial.read();
140    melody_tracker = 0;
141
142    if (input == '1') {
143      current_melody = melody_mary;
144      current_melody_length = length_mary;
145      free_play_mode = false;
146      Serial.println("Now playing: Mary Had a Little Lamb");
147    } else if (input == '2') {
148      current_melody = melody_twinkle;
149      current_melody_length = length_twinkle;
150      free_play_mode = false;
151      Serial.println("Now playing: Twinkle Twinkle Little Star");
152    } else if (input == '3') {
153      current_melody = melody_bus;
154      current_melody_length = length_bus;
155      free_play_mode = false;
156      Serial.println("Now playing: The Wheels on the Bus");
157    } else if (input == '4') {
158      current_melody = melody_yankee_doodle;
159      current_melody_length = length_yankee_doodle;
160      free_play_mode = false;
161      Serial.println("Now playing: Yankee Doodle");
162    } else if (input == '0') {
163      free_play_mode = true;
164      Serial.println("🎹 Free play mode activated!");
165    } else {
166      Serial.println("Invalid choice. Please enter 0, 1, 2, 3, or 4.");
167    }
168  }
169
170  if (time_now - last_time_ultrasonic_trigger > ultrasonic_trigger_delay) {
171    last_time_ultrasonic_trigger = time_now;
172    trigger_ultrasonic_sensor();
173  }
174
175  if (!free_play_mode && melody_tracker < current_melody_length) {
176    int next_led = current_melody[melody_tracker];
177    turn_off_all_leds();
178    digitalWrite(next_led, HIGH);
179  }
180
181  if (new_distance_available) {
182    new_distance_available = false;
183    double distance = get_distance();
184    int note_index = -1;
185
186    if (distance > 2 && distance <= 10) note_index = 0;
187    else if (distance > 10 && distance <= 20) note_index = 1;
188    else if (distance > 20 && distance <= 30) note_index = 2;
189    else if (distance > 30 && distance <= 40) note_index = 3;
190    else if (distance > 40 && distance <= 50) note_index = 4;
191    else if (distance > 50 && distance <= 60) note_index = 5;
192    else if (distance > 60 && distance <= 70) note_index = 6;
193    else if (distance > 70 && distance <= 80) note_index = 7;  // NEW: High Do
194
195    if (note_index != -1) {
196      int led;
197      if (note_index == 7) {
198        led = LED_Do_High;  // NEW High Do
199      } else {
200        led = LED_Do - note_index;
201      }
202
203      if (free_play_mode) {
204        turn_off_all_leds();
205        digitalWrite(led, HIGH);
206        tone(BUZZER_PIN, notes[note_index]);
207        delay(time_delay);
208        noTone(BUZZER_PIN);
209      } else if (melody_tracker < current_melody_length && current_melody[melody_tracker] == led) {
210        tone(BUZZER_PIN, notes[note_index]);
211        delay(time_delay);
212        noTone(BUZZER_PIN);
213        melody_tracker++;
214
215        if (melody_tracker >= current_melody_length) {
216          melody_tracker = 0;
217          turn_off_all_leds();
218          Serial.println("🎵 Song finished. Pick a new one (0, 1, 2, 3, or 4).\n");
219        }
220      }
221    }
222  }
223}