An Arduino Organ with Kinder Surprise

arduinoOrgan.ino

/*
  Arduino Organ by pollux labs, 2020
  More procects and tutorials: https://polluxlabs.net
*/

// Import the CapacitiveSensor Library.
#include <CapacitiveSensor.h>

//Define speaker pin
#define speaker 11

//Set sensor sensitivity
int sensitivity = 3000;

//Set threshold for triggering a tone
int threshold = 5000;

// Set the Send Pin & Receive Pin.
CapacitiveSensor   cs_2_4 = CapacitiveSensor(2, 4);
CapacitiveSensor   cs_2_5 = CapacitiveSensor(2, 5);
CapacitiveSensor   cs_2_6 = CapacitiveSensor(2, 6);
CapacitiveSensor   cs_2_7 = CapacitiveSensor(2, 7);
CapacitiveSensor   cs_2_8 = CapacitiveSensor(2, 8);

void setup()
{
  Serial.begin(115200);
}

void loop()
{
  // Set the sensitivity of the sensors
  long sensor4 =  cs_2_4.capacitiveSensor(sensitivity);
  long sensor5 =  cs_2_5.capacitiveSensor(sensitivity);
  long sensor6 =  cs_2_6.capacitiveSensor(sensitivity);
  long sensor7 =  cs_2_7.capacitiveSensor(sensitivity);
  long sensor8 =  cs_2_8.capacitiveSensor(sensitivity);

  Serial.print(sensor4);
  Serial.print("\t");
  Serial.print(sensor5);
  Serial.print("\t");
  Serial.print(sensor6);
  Serial.print("\t");
  Serial.print(sensor7);
  Serial.print("\t");
  Serial.println(sensor8);

  // When your hand touches the sensor, the speaker will produce a tone.
  // Probably you'll have to experiment with the threshold.
  if (sensor4 > threshold) tone(speaker, 440); // A
  if (sensor5 > threshold) tone(speaker, 523); // C
  if (sensor6 > threshold) tone(speaker, 587); // D
  if (sensor7 > threshold) tone(speaker, 659); // E
  if (sensor8 > threshold) tone(speaker, 784); // G

  // When nothing is touched the speaker is quiet
  if (sensor4 <= threshold  &  sensor5 <= threshold & sensor6 <= threshold  &  sensor7 <= threshold &  sensor8 <= threshold) {
    noTone(speaker);
  }

  delay(10);
}