An octave of bananas makes a piano!
Devices and components
Arduino Uno Rev3
Speaker, 8 ohms
Resistance 220 ohms
Breadboard (generic)
Alligator clips
Resistor 2.2M Ohm, 1/4 Watt
Connection wire for flat cable, 30 cm
Software and tools
Arduino IDE
Project description
pitches.h
pitches.h from Arduino IDE code examples
1/*************************************************
2 * Public Constants
3 *************************************************/
4
5#define NOTE_B0 31
6#define NOTE_C1 33
7#define NOTE_CS1 35
8#define NOTE_D1 37
9#define NOTE_DS1 39
10#define NOTE_E1 41
11#define NOTE_F1 44
12#define NOTE_FS1 46
13#define NOTE_G1 49
14#define NOTE_GS1 52
15#define NOTE_A1 55
16#define NOTE_AS1 58
17#define NOTE_B1 62
18#define NOTE_C2 65
19#define NOTE_CS2 69
20#define NOTE_D2 73
21#define NOTE_DS2 78
22#define NOTE_E2 82
23#define NOTE_F2 87
24#define NOTE_FS2 93
25#define NOTE_G2 98
26#define NOTE_GS2 104
27#define NOTE_A2 110
28#define NOTE_AS2 117
29#define NOTE_B2 123
30#define NOTE_C3 131
31#define NOTE_CS3 139
32#define NOTE_D3 147
33#define NOTE_DS3 156
34#define NOTE_E3 165
35#define NOTE_F3 175
36#define NOTE_FS3 185
37#define NOTE_G3 196
38#define NOTE_GS3 208
39#define NOTE_A3 220
40#define NOTE_AS3 233
41#define NOTE_B3 247
42#define NOTE_C4 262
43#define NOTE_CS4 277
44#define NOTE_D4 294
45#define NOTE_DS4 311
46#define NOTE_E4 330
47#define NOTE_F4 349
48#define NOTE_FS4 370
49#define NOTE_G4 392
50#define NOTE_GS4 415
51#define NOTE_A4 440
52#define NOTE_AS4 466
53#define NOTE_B4 494
54#define NOTE_C5 523
55#define NOTE_CS5 554
56#define NOTE_D5 587
57#define NOTE_DS5 622
58#define NOTE_E5 659
59#define NOTE_F5 698
60#define NOTE_FS5 740
61#define NOTE_G5 784
62#define NOTE_GS5 831
63#define NOTE_A5 880
64#define NOTE_AS5 932
65#define NOTE_B5 988
66#define NOTE_C6 1047
67#define NOTE_CS6 1109
68#define NOTE_D6 1175
69#define NOTE_DS6 1245
70#define NOTE_E6 1319
71#define NOTE_F6 1397
72#define NOTE_FS6 1480
73#define NOTE_G6 1568
74#define NOTE_GS6 1661
75#define NOTE_A6 1760
76#define NOTE_AS6 1865
77#define NOTE_B6 1976
78#define NOTE_C7 2093
79#define NOTE_CS7 2217
80#define NOTE_D7 2349
81#define NOTE_DS7 2489
82#define NOTE_E7 2637
83#define NOTE_F7 2794
84#define NOTE_FS7 2960
85#define NOTE_G7 3136
86#define NOTE_GS7 3322
87#define NOTE_A7 3520
88#define NOTE_AS7 3729
89#define NOTE_B7 3951
90#define NOTE_C8 4186
91#define NOTE_CS8 4435
92#define NOTE_D8 4699
93#define NOTE_DS8 4978
94
95
96
pitches.h
pitches.h from Arduino IDE code examples
1/*************************************************
2 * Public Constants
3
4 *************************************************/
5
6#define NOTE_B0 31
7#define
8 NOTE_C1 33
9#define NOTE_CS1 35
10#define NOTE_D1 37
11#define NOTE_DS1 39
12#define
13 NOTE_E1 41
14#define NOTE_F1 44
15#define NOTE_FS1 46
16#define NOTE_G1 49
17#define
18 NOTE_GS1 52
19#define NOTE_A1 55
20#define NOTE_AS1 58
21#define NOTE_B1 62
22#define
23 NOTE_C2 65
24#define NOTE_CS2 69
25#define NOTE_D2 73
26#define NOTE_DS2 78
27#define
28 NOTE_E2 82
29#define NOTE_F2 87
30#define NOTE_FS2 93
31#define NOTE_G2 98
32#define
33 NOTE_GS2 104
34#define NOTE_A2 110
35#define NOTE_AS2 117
36#define NOTE_B2
37 123
38#define NOTE_C3 131
39#define NOTE_CS3 139
40#define NOTE_D3 147
41#define
42 NOTE_DS3 156
43#define NOTE_E3 165
44#define NOTE_F3 175
45#define NOTE_FS3
46 185
47#define NOTE_G3 196
48#define NOTE_GS3 208
49#define NOTE_A3 220
50#define
51 NOTE_AS3 233
52#define NOTE_B3 247
53#define NOTE_C4 262
54#define NOTE_CS4
55 277
56#define NOTE_D4 294
57#define NOTE_DS4 311
58#define NOTE_E4 330
59#define
60 NOTE_F4 349
61#define NOTE_FS4 370
62#define NOTE_G4 392
63#define NOTE_GS4
64 415
65#define NOTE_A4 440
66#define NOTE_AS4 466
67#define NOTE_B4 494
68#define
69 NOTE_C5 523
70#define NOTE_CS5 554
71#define NOTE_D5 587
72#define NOTE_DS5
73 622
74#define NOTE_E5 659
75#define NOTE_F5 698
76#define NOTE_FS5 740
77#define
78 NOTE_G5 784
79#define NOTE_GS5 831
80#define NOTE_A5 880
81#define NOTE_AS5
82 932
83#define NOTE_B5 988
84#define NOTE_C6 1047
85#define NOTE_CS6 1109
86#define
87 NOTE_D6 1175
88#define NOTE_DS6 1245
89#define NOTE_E6 1319
90#define NOTE_F6
91 1397
92#define NOTE_FS6 1480
93#define NOTE_G6 1568
94#define NOTE_GS6 1661
95#define
96 NOTE_A6 1760
97#define NOTE_AS6 1865
98#define NOTE_B6 1976
99#define NOTE_C7
100 2093
101#define NOTE_CS7 2217
102#define NOTE_D7 2349
103#define NOTE_DS7 2489
104#define
105 NOTE_E7 2637
106#define NOTE_F7 2794
107#define NOTE_FS7 2960
108#define NOTE_G7
109 3136
110#define NOTE_GS7 3322
111#define NOTE_A7 3520
112#define NOTE_AS7 3729
113#define
114 NOTE_B7 3951
115#define NOTE_C8 4186
116#define NOTE_CS8 4435
117#define NOTE_D8
118 4699
119#define NOTE_DS8 4978
120
121
122
BananaPiano.ino
This is the main program to control the banana piano. It uses pitches.h.
1/*
2 Banana Piano
3
4 This code implements a single octave of a simple piano. It borrows from Tom Igoe's tone
5 example ( http://arduino.cc/en/Tutorial/Tone ) and uses his pitches.h include file for
6 the note frequencies. The digital input pins and their corresponding notes are defined
7 in arrays. Serial monitor output is provided to test key logic levels.
8
9 The digital inputs use 2.2 Meg Ohm pull-up resistors. The digital inputs are brought to
10 logic level LOW by grounding the banana connected to each digital input.
11
12 Circuit:
13 8 - 2.2 Meg Ohm pull-up resistors, connected to +5 V and each of the digital input pins
14 1 - 220 Ohm resistor, connected from pin 12 to an 8 Ohm speaker
15
16 R. Ballew, 31-Jan-2018
17
18*/
19#include "pitches.h"
20
21int numKeys = 8;
22int digInput[] = { 2, 3, 4, 5, 6, 7, 8, 9 };
23int myNote[] = { NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4, NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5 };
24int toneOut = 12;
25
26void setup() {
27 // Start serial connection
28 Serial.begin(9600);
29 // Configure digital input pins
30 for (int i = 0; i < numKeys; i++) {
31 pinMode(digInput[i], INPUT);
32 }
33 pinMode(toneOut, OUTPUT);
34}
35
36void loop() {
37 //
38 int keypressed = 0;
39 for (int j = 0; j < numKeys; j++) {
40 int sensorVal = digitalRead(digInput[j]);
41 String outStr = String("K");
42 outStr = String(outStr + j);
43 outStr = String(outStr + ": ");
44 outStr = String(outStr + sensorVal);
45 if (sensorVal == LOW) {
46 ++keypressed; // increment keypressed
47 digitalWrite(13, HIGH);
48 tone(toneOut, myNote[j]);
49 }
50 //outStr = String(outStr + ":");
51 //outStr = String(outStr + keypressed);
52 Serial.print(outStr);
53 Serial.print("\ ");
54 }
55 Serial.println("");
56 if (keypressed == 0) {
57 noTone(toneOut);
58 }
59 delay(250);
60}
61
Downloadable files
Schematic
Banana Piano Circuit Diagram
Schematic
Schematic
Banana Piano Circuit Diagram
Schematic
Note: Content and images are from: https://projecthub.arduino.cc/, with some modifications.
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