Singing Raybow

A "singing" piezo buzzer that changes pitch according to a potentiometer and a tilt switch.

BeginnerFull instructions provided36

Things used in this project

Hardware components

Texas Instruments EK-TM4C123GXL TM4C Tiva LaunchPad

Breadboard (generic)

Jumper wires (generic)

Buzzer, Piezo

Rotary potentiometer (generic)

Tilt Switch, SPST

Software apps and online services

Texas Instruments Energia

Story

Introduction

Ever scared to go karaoke with your friends because you can't sing? Don't worry, our piezo buzzer has got you covered!

We have created Singing Raybow, a cute little device that can sing beautiful notes. By rotating the potentiometer, we can change the pitch of the piezo buzzer, thus creating variating tones. With a newly incorporated tilt switch, the piezo buzzer will not be constantly singing. When the breadboard is tilted to be perpendicular to the ground, then the piezo buzzer will stop.

1 / 2 • Singing Raybow :0

Building Process

First, set up your launchpad and get familiarized with Energia!

Then, connect the potentiometer and the piezo buzzer according to the schematics below using jumper wires. (connect potentiometer in series with piezo buzzer)

Finally, make adjustments to the code (hint: many if statements) to make the piezo buzzer sing customizable notes. There are pre-defined notes for all the keys in piano, and we could choose what note we want to play for different positions of the potentiometer.

Singing Raybow in Action <3

Code

Raybow Piano

/*
  Raybow sings scale

  We will use a variable resistor called a potentiometer
  (or pot for short) that uses a mechanical knob to
  change the resistance. We can also use the buzzer on the LaunchPad to    sing a C-major scale as we turn the knob.

  Hardware Required:
  * TI LaunchPad
  * Breadboard BoosterPack
  * Breadboard
  * Potentiometer
  * 6x Jumper wires
  * Buzzer

  This example code is in the public domain.
*/

// define your pitch constants for the buzzer
#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

/* In the setup function we will set buzzer as
 * OUTPUT. You can change the LED or buzzer pin to match
 * your cicuit. 
 */
void setup()
{
  // Connect potentiometer wiper (middle pin) to analog pin 2
  // Connect the left and right pins to VCC and GND
  // Connect the buzzer longer leg to pin 19 and shorter leg
  // to GND
  // Note: we don&apos;t have to configure analog pins as input or
  // output to use them
  pinMode(19, OUTPUT); // set your Buzzer pin to OUTPUT
  tone(19,NOTE_C6);
  noTone(19);
  Serial.begin(4800);
}

/* In the loop section we will read potentiometer pin. If
 * it crosses the threshold then we will turn on the LED
 * and play a tone with the buzzer. If it goes below the
 * threshold then the LED and buzzer turn off.
 */
void loop()
{
  int analogValue; // create a variable to store the analog reading
  analogValue = analogRead(2); // store the analog reading
  delay(1); // delay for 1 millisecond for smoothness
  // set a threshold of 512 which is a good midway value for our
  // analog range on the LaunchPads


  //Serial.println(analogValue);
  if (analogValue >= 4000){
    tone(19, NOTE_C6);
    Serial.println("sing C7");
  }
  else if (analogValue >= 3500){
    tone(19, NOTE_B5);
    Serial.println("sing B6");
  }
  else if (analogValue >= 3000){
    tone(19, NOTE_A5);
    Serial.println("sing A6");
  }
  else if (analogValue >= 2500){
    tone(19, NOTE_G5);
    Serial.println("sing G6");
  }
  else if (analogValue >= 2000){
    tone(19, NOTE_F5);
    Serial.println("sing F6");
  }
  else if (analogValue >= 1500){
    tone(19, NOTE_E5);
    Serial.println("sing E6");
  }
  else if (analogValue >= 1000){
    tone(19, NOTE_D5);
    Serial.println("sing D6");
  }
  else if (analogValue < 500){
    noTone(19);
    Serial.println("stops");// stop playing a tone
  }
  else{
    tone(19, NOTE_C5);
    Serial.println("sing C5");
  }
 noTone(19);
}

Singing Raybow