Graphene/Piano touch

Pianoforte touch

• Capsense Piano
• 

  Capsense piano, microduino, connettore e cavo flat

Il codice del progetto lo abbiamo preso già pronto sul sito instructables è un progetto di Tyler Crumpton and Nicholas Jones ([1]) , abbiamo semplicemente adattato la parte dei sensori di ingresso utilizzando pellicola in grafene e stampando un foglio con i tasti disegnati.

Per l'hardware abbiamo utilizzato una board microduino a cui abbiamo saldato le 8 resistenze per le note mettendo un pin comune sul pin D2 che il microcontrollore usa per la carica. Abbiamo utilizzato un buzzer piezo come attuatore audio.

La connessione con il foglio in grafene avviene tramite cavo flat e connettore per floppy disk che è in grado di aggrappare un foglio incastrato al suo interno aveno contatti a pressione.

File capsense_piano.c

/*
  Capacitive-Touch Arduino Keyboard Piano
  
  Plays piano tones through a buzzer when the user taps touch-sensitive piano "keys"
  
  Created  18 May 2013
  Modified 23 May 2013
  by Tyler Crumpton and Nicholas Jones
  
  This code is released to the public domain. For information about the circuit,
  visit the Instructable tutorial at http://www.instructables.com/id/Capacitive-Touch-Arduino-Keyboard-Piano/
*/

#include <CapacitiveSensor.h>
#include "pitches.h"

#define COMMON_PIN      2    // The common 'send' pin for all keys
#define BUZZER_PIN      A4   // The output pin for the piezo buzzer
#define NUM_OF_SAMPLES  10   // Higher number whens more delay but more consistent readings
#define CAP_THRESHOLD   60  // Capactive reading that triggers a note (adjust to fit your needs)
#define NUM_OF_KEYS     8    // Number of keys that are on the keyboard

// This macro creates a capacitance "key" sensor object for each key on the piano keyboard:
#define CS(Y) CapacitiveSensor(2, Y)

// Each key corresponds to a note, which are defined here. Uncomment the scale that you want to use:
int notes[]={NOTE_C4,NOTE_D4,NOTE_E4,NOTE_F4,NOTE_G4,NOTE_A4,NOTE_B4,NOTE_C5}; // C-Major scale                   // E' possibile cambiare la scala decommentando queste righe.
//int notes[]={NOTE_A4,NOTE_B4,NOTE_C5,NOTE_D5,NOTE_E5,NOTE_F5,NOTE_G5,NOTE_A5}; // A-Minor scale
//int notes[]={NOTE_C4,NOTE_DS4,NOTE_F4,NOTE_FS4,NOTE_G4,NOTE_AS4,NOTE_C5,NOTE_DS5}; // C Blues scale

// Defines the pins that the keys are connected to:
CapacitiveSensor keys[] = {CS(3), CS(4), CS(5), CS(6), CS(7), CS(8), CS(9), CS(10)};

void setup() { 
  // Turn off autocalibrate on all channels:
  for(int i=0; i<8; ++i) {
    keys[i].set_CS_AutocaL_Millis(0xFFFFFFFF);
  }
  // Set the buzzer as an output:
  pinMode(BUZZER_PIN, OUTPUT); 
}

void loop() {    
  // Loop through each key:
  for (int i = 0; i < 8; ++i) {
    // If the capacitance reading is greater than the threshold, play a note:
    if(keys[i].capacitiveSensor(NUM_OF_SAMPLES) > CAP_THRESHOLD) {
      tone(BUZZER_PIN, notes[i],20); // Plays the note corresponding to the key pressed                 // L'ultimo parametro è la durata della nota, aggiunto al codice originale altrimenti le note continuano a suonare
    }
  }
}

File pitches.s, questo file indica la frequenza a cui va suonata ogni nota e va agguinto al progetto salvandolo nella cartella dello sketch capsense_piano

// This file contains a list of 8 octaves worth of pitches
//  that correspond to notes on the piano.
#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_C5  523
#define NOTE_CS5 554
#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
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

Siamo in attesa di stampare un foglio in grafene con i tasti stampati in inchiostro al grafene.