Piano Capacitivo feito de Papel Alumínio

Esse projeto é um pequeno piano, que usa papel alumínio como 'teclas'. O objetivo é demonstrar a função 'nativa' do arduino, para tornar materiais condutivos em sensores capacitivos.

Esquema de Montagem

Montagem na Prática

Componentes

• Arduino Uno
• Protoboard
• 7 Jumpers
• Buzzer
• Papel Alumínio
• Fita isolante
• EVA branco
• EVA preto

Complemento

Modelo de Piano

Abaixo a partitura da música "Dó, ré, mi, fá":

Programação

//Piano Capacitivo feito de Papel Alumínio //www.professorakeila.com.br #define NOTA_DO 262 #define NOTA_RE 294 #define NOTA_MI 330 #define NOTA_FA 349 #define NOTA_SOL 392 #define NOTA_LA 440 #define NOTA_SI 493 int buzzer = 13, valor2,valor3,valor4,valor5,valor6,valor7,valor8; void setup() { pinMode(buzzer,OUTPUT); } void loop() { valor2 = readCapacitivePin(2); valor3 = readCapacitivePin(3); valor4 = readCapacitivePin(4); valor5 = readCapacitivePin(5); valor6 = readCapacitivePin(6); valor7 = readCapacitivePin(7); valor8 = readCapacitivePin(8); //pino 2 if(valor2>3){ tone(buzzer, NOTA_DO); delay(100); } else{ noTone(buzzer); } //pino 3 if(valor3>3){ tone(buzzer, NOTA_RE); delay(100); } else{ noTone(buzzer); } //pino 4 if(valor4>3){ tone(buzzer, NOTA_MI); delay(100); } else{ noTone(buzzer); } //pino 5 if(valor5>3){ tone(buzzer, NOTA_FA); delay(100); } else{ noTone(buzzer); } //pino 6 if(valor6>3){ tone(buzzer, NOTA_SOL); delay(100); } else{ noTone(buzzer); } //pino 7 if(valor7>3){ tone(buzzer, NOTA_LA); delay(100); } else{ noTone(buzzer); } //pino 8 if(valor8>3){ tone(buzzer, NOTA_SI); delay(100); } else{ noTone(buzzer); } } // readCapacitivePin // Input: Arduino pin number // Output: A number, from 0 to 17 expressing // how much capacitance is on the pin // When you touch the pin, or whatever you have // attached to it, the number will get higher #include "pins_arduino.h" // Arduino pre-1.0 needs this uint8_t readCapacitivePin(int pinToMeasure) { // Variables used to translate from Arduino to AVR pin naming volatile uint8_t* port; volatile uint8_t* ddr; volatile uint8_t* pin; // Here we translate the input pin number from // Arduino pin number to the AVR PORT, PIN, DDR, // and which bit of those registers we care about. byte bitmask; port = portOutputRegister(digitalPinToPort(pinToMeasure)); ddr = portModeRegister(digitalPinToPort(pinToMeasure)); bitmask = digitalPinToBitMask(pinToMeasure); pin = portInputRegister(digitalPinToPort(pinToMeasure)); // Discharge the pin first by setting it low and output *port &= ~(bitmask); *ddr |= bitmask; delay(1); // Make the pin an input with the internal pull-up on *ddr &= ~(bitmask); *port |= bitmask; // Now see how long the pin to get pulled up. This manual unrolling of the loop // decreases the number of hardware cycles between each read of the pin, // thus increasing sensitivity. uint8_t cycles = 17; if (*pin & bitmask) { cycles = 0;} else if (*pin & bitmask) { cycles = 1;} else if (*pin & bitmask) { cycles = 2;} else if (*pin & bitmask) { cycles = 3;} else if (*pin & bitmask) { cycles = 4;} else if (*pin & bitmask) { cycles = 5;} else if (*pin & bitmask) { cycles = 6;} else if (*pin & bitmask) { cycles = 7;} else if (*pin & bitmask) { cycles = 8;} else if (*pin & bitmask) { cycles = 9;} else if (*pin & bitmask) { cycles = 10;} else if (*pin & bitmask) { cycles = 11;} else if (*pin & bitmask) { cycles = 12;} else if (*pin & bitmask) { cycles = 13;} else if (*pin & bitmask) { cycles = 14;} else if (*pin & bitmask) { cycles = 15;} else if (*pin & bitmask) { cycles = 16;} // Discharge the pin again by setting it low and output // It's important to leave the pins low if you want to // be able to touch more than 1 sensor at a time - if // the sensor is left pulled high, when you touch // two sensors, your body will transfer the charge between // sensors. *port &= ~(bitmask); *ddr |= bitmask; return cycles; }