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Arduino Musical Tune Generator Circuit

Last Updated on December 5, 2024 by Swagatam 2 Comments

You can use this little Arduino musical tune generator circuit for a preferred application, such as for making an interesting door bell, as a car reverse horn, or music box for gifting somebody, or simply for personal amusement.

Table of Contents
  • Hardware Required
  • For Amplified Output

Hardware Required

The Hardware required for the project are given as follows:

  • Arduino or Genuino board
  • piezo buzzer or a speaker
  • hook-up wires

The Arduino is powered with a 9V, 500mA power supply input which could be from any standard SMPS AC to DC adapter, or you can also try your cell phone charger for the same.

Pin#8 from the Arduino can be directly configured with the speaker which must not be rated above 8 ohm, and 1 watt.

So one wire of the speaker connects with pin#8 of the Arduino board and the other wire goes to the negative line or the ground line of the board.

warning message: electricity is dangerous, proceed with caution

For Amplified Output

For louder or hugely amplified sound you can configure the pin#8 with a transistor driver stage, consisting of a TIP31 transistor, whose base may be connected with pin8 via a 1K resistor, emitter to ground and the collector to one of the wires of the speaker, the other wire of the speaker now connects with the positive supply that is the 9V supply (+).

Here make sure the speaker is rated at 8 ohms but at much higher wattage, may be at around 5 watts for an amplified music tune generation.

This sketch is coded to play and generate quite many random
melodies in sequence using a pentatonic scale
/*
Musician
Plays a (fairly) random tune until the program is stopped.
8-ohm speaker on digital pin 8.
//Copyright (c) 2012 Jeremy Fonte
//This code is released under the MIT license
//https://opensource.org/licenses/MIT
*/
int randomNote = 131;
int randomDuration = 2;
int noteStep = 1;
int notes[15];
void setup() {
pinMode(8, OUTPUT);
notes[1] = 131;
notes[2] = 147;
notes[3] = 165;
notes[4] = 196;
notes[5] = 220;
notes[6] = 262;
notes[7] = 294;
notes[8] = 330;
notes[9] = 392;
notes[10] = 440;
notes[11] = 523;
notes[12] = 587;
notes[13] = 659;
notes[14] = 784;
notes[15] = 880;
randomNote = random(1, 15);
}
void loop() {
noteStep = random(-3, 3);
randomNote = randomNote + noteStep;
if(randomNote < 1) {
randomNote = random(1, 15);
}
else if(randomNote > 15) {
randomNote = random(1, 15);
}
randomDuration = random(1, 8);
// to calculate the note duration, take one second
// divided by the note type.
//e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
int noteDuration = 1000/randomDuration;
tone(8, notes[randomNote],noteDuration);
// to distinguish the notes, set a minimum time between them.
// the note's duration + 30% seems to work well:
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
// stop the tone playing:
noTone(8);
}

The connection diagram for the proposed Arduino musical tune generator circuit is shown below:

Arduino Musical Tune Generator Circuit

For high power amplified listening, the same set up can be upgraded with a power transistor as indicated in the following figure:

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Filed Under: Arduino Projects, Audio and Amplifier Projects Tagged With: Arduino, Generator, Musical, Tune

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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Reader Interactions

Comments

  1. Unknown says

    April 17, 2016 at 12:04 am

    Hi! Does this example fits for 4ohms 3W speaker?

    Reply
    • Swagatam says

      April 17, 2016 at 2:28 pm

      yes you can try it, no issues.

      Reply

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