Introduction: Arduino Trumpet

Picture of Arduino Trumpet

This project emulates a trumpet by playing notes using the three buttons (valves). This is easy to make and fun to play with, though it can only play one octave and no sharps/flats.

Step 1: Code

Load this into your Arduino:

int speaker = 9; // Hook up speaker to digital pin 9
int sw1 = 15; // Switch hooked to analog pin 1
int sw2 = 16; // Switch hooked to analog pin 2
int sw3 = 17; // Switch hooked to analog pin 3
int valve1;
int valve2;
int valve3;

void c () { // Presets the note "c" to be used later
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void d () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void e () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void f () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void g () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void a () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void b () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);
void C () {
digitalWrite(speaker, HIGH);
digitalWrite(speaker, LOW);

void setup() {
pinMode(speaker, OUTPUT);
pinMode(sw1, INPUT);
digitalWrite(sw1, HIGH);
pinMode(sw2, INPUT);
digitalWrite(sw2, HIGH);
pinMode(sw3, INPUT);
digitalWrite(sw3, HIGH);
// Serial.begin(9600);

void loop() {
valve1 = digitalRead(sw1); // Reads switch 1
valve2 = digitalRead(sw2); // Reads switch 2
valve3 = digitalRead(sw3); // Reads switch 3

if ((valve1 == LOW) && (valve2 == LOW) && (valve3 == LOW)) { // If all valves are pressed, then
c(); // It plays a "c"
else if ((valve1 == LOW) && (valve2 == HIGH) && (valve3 == LOW)) { // If the first and third valves are pressed, then
d(); // It plays a "d"
else if ((valve1 == LOW) && (valve2 == LOW) && (valve3 == HIGH)) { // If the first and second valves are pressed, then
e(); // It plays a "e"
else if ((valve1 == LOW) && (valve2 == HIGH) && (valve3 == HIGH)) { // If the first valve is pressed, then
f(); // It plays a "f"
else if ((valve1 == HIGH) && (valve2 == HIGH) && (valve3 == HIGH)) { // If no valves are pressed, then
g(); // It plays a "g"
else if ((valve1 == HIGH) && (valve2 == HIGH) && (valve3 == LOW)) { // If the third valve is pressed, then
a(); // It plays a "a"
else if ((valve1 == HIGH) && (valve2 == LOW) && (valve3 == HIGH)) { // If the second valve is pressed, then
b(); // It plays a "b"
else if ((valve1 == HIGH) && (valve2 == LOW) && (valve3 == LOW)) { // If the second and third valves are pressed, then
C(); // It plays a "C"

Step 2: Hook It Up

Picture of Hook It Up

Each of the three switches go from ground to analog in 1, 2, and 3. The Piezo goes from digital pin 9 to ground. Make sure to have the switches in the right order in order to have the correct fingerings. Afterwords, download the file and upload it to your Arduino.

Step 3: Materials

Picture of Materials

You will need:

-9v battery and clasp
-3 momentary switches (NO)
-Project box (4x2x1)
-Piezo speaker element
-Header pins
-Soldering stuff
-Drill and 1/4 in bit along with 1/16 in

Step 4: Put It Together!!

Picture of Put It Together!!

First, open the box and on the outside, mark the center and an inch out from the center. These marks are where you will need to make a 1/4 in hole ( I would suggest using a pilot hole).

Now, dremel out the scraps of plastic and the holders used to hold a PC inside, we will not be needing these.

Step 5: Make It Fit

Picture of Make It Fit

Insert the switches and make sure they fit and screw them in.

Insert the pins into the correct spot and then mark the case where they are and drill holes with a 1/16 in drill bit. Then, make sure it fits and then flip it over to the open side.

Step 6: Wireing

Picture of Wireing

Now, solder a wire to each of the analog input posts and attach the other side to the corresponding switch. Make sure to not get mixed up and solder the wrong switch to the wrong pin. The other side goes to ground. Sound Fimiliar?

Like before, solder the piezo to pin 9 and ground and the battery clasp to ground and voltage in.

Then, Hotglue over the solder connections on the pins, and attach the battery, you should hear a tone, if not check your wireing.

Afterwords, cram in the battery and piezo, its a tight fit! I found it best to put the speaker by the pins and the battery on the other side. Whatever works.

Step 7: Playing

Picture of Playing

The fingerings on this trumpet are 'similar' to a normal trumpet. By 'similar' I mean I had to make a few changes.

on a normal trumpet its like this:
f ..........1
g..........0pen / 1-3
a..........1-2 / 3
C..........0pen / 2-3

On the Arduino Trumpet:
f ..........1

I could have complicated things and put an octive changing switch and used half steps. Though it would be awsome, It would be more complicated and I would need a bigger box.



josei_ng (author)2016-07-19

Whats the schematic drawing of the circuit?

MikenHarnish (author)2016-04-17

how do you write more notes in? like another octave

RaeganH (author)2016-04-15

i am a middle school student that did this for a class project. could someone help me with adding another button to be the rest or something. i cant have the constant noise.

Lintang_Wisesa made it! (author)2016-02-02

Nice tutorial, here's mine: ^_^

TomB88 (author)2015-11-09

it may have been possible to include another octave by adding a sensor that you could "blow" or just hold infront of your face, this could be achieved by a light sensitive or pressure sensitive module. LOVE the project though !

nmrobotics (author)2015-06-05

What would i have to change to use a buzzer instead of a speaker?

Arduino Tech (author)2014-11-05

is it a speaker or a buzzer ??

pyromaniac123456789 (author)2014-01-20

could have more pictures for the wiring?

Maker1721 (author)2012-11-24

Does this project need a breadboard?

hankenstien (author)2012-06-20

Cool IDea,
I took your idea, and instead of buttons i used potentiometers, just to see what would happen, it was kinda cool, you could get and hold various tones, might be fun if some one knew how to hack the code to read the potentiometer values, so it was more then an on or off type thing, any cool idea, i also like the piezo blow hole idea, read hears somewhere.

jonoxer (author)2009-06-11

Adding a pressure sensor wouldn't be hard at all. You just need something like a MPX2010DP differential pressure transducer then feed it into an op-amp comparitor / amplifier, then read that with analog in on the Arduino. I've just done exactly that for a totally different purpose (measuring the depth of a water tank) and the circuit I built would work perfectly in this trumpet. In fact while building it I tested the circuit by blowing into the transducer and watching the analog read value change! There's more about it here including a photo of the shield:

srikarbeechu (author)jonoxer2010-05-03

 hello sir its great to hear as that we can use a DPT but sir i have a major problem making the transducer work for your own application for  TANK DEPTH SENSOR. Sir i kindly oblige you to help me or teach how to work on DPT. please my sincere request please i would be glad if u could give me your facebook userbook i really need to chat with u sir.please.

jonoxer (author)srikarbeechu2010-05-03

 @srikarbeechu Have you read the explanation in the book? I can't really help you unless I know what you've tried.

srikarbeechu (author)jonoxer2010-05-03

@ jonoxer sir kindly help me how to work with MPX@)!)DP DPT... i am unable to measure the output voltage of the transducer and the water tank depth sensor experiment. 

no0x (author)2010-03-13

That's great !
How can we do to have more sound from the piezo ?
Have we to put an amplifier or something else ?
Thanks !

Kulf (author)2010-03-11

 Would you be able to modify this code to use with a guitar hero guitar? So when you press the frets and strum the bar it plays the tones. That's what I'm planning on doing.

mman1506 (author)2009-11-07

don't you need a pull down resistor or somthing 

Ouroboros439 (author)2009-06-11

No vote until I hear it. How do I know if yours even works? Come on just a little blues or some Louie Armstrong.

ReCreate (author)Ouroboros4392009-09-18

It would theoretically work, And most likely would too, by looking at the code. Though it might sound a bit bad, as it generates square waves, the only easy way to create sound in the arduino, it would sound better if it was a sine wave...

QuiksilverRox (author)ReCreate2009-09-19

Yah the square wave is kind-of robotic but it gets the job done.

ReCreate (author)QuiksilverRox2009-09-19

Yeah it sure does ;)

Mdob (author)ReCreate2009-09-19

It sounds fine I made it and it works. I'm in the process of making it only work if you press a button and making it light up when you press down the valves.

ReCreate (author)Mdob2009-09-19

Well then, It works, Just as i thought, Well good luck with that ;)

Istarian (author)2009-06-11

This is really cool. However I have some suggestions. One, there is a page on the arduino website which has a number of sound related project/things here:
Which has some interesting stuff on generating sound or playing it. Also this page: has code for playing a pre coded series of tones on a piezo speaker/earphone and has the actual tones as variables. That think is a little easier. Like: a = 946; (that's not actually true) and then something like this: play(a) I'm thinking you might be able to simply/optimize/shorten your code to make it a little less complicated.

QuiksilverRox (author)Istarian2009-06-11

I based mine off the melody example.

Istarian (author)QuiksilverRox2009-06-11

Ah, ok. I',m curious why you chose not to have one function and preset tonal values, but rather a function for each sound.

ReCreate (author)Istarian2009-09-18

Its more fun the overly complicated way :D

Mdob (author)2009-07-04

Um sorry if i'm being a noob but would <a rel="nofollow" href="">this</a> piezo work?<br/>

QuiksilverRox (author)Mdob2009-07-05

It would work but it's operating voltage is 1.5v so you'll need a resistor. Also it's sound level is 75db, that's pretty loud.

ReCreate (author)QuiksilverRox2009-09-18

Now imagine Pumping 5V into that sucker, I guess that the sound level could reach 200DB O_O

Mdob (author)QuiksilverRox2009-07-05

I'm just starting in electronics so could you please tell me where to put the resistor (i think on the + wire of the piezo connecting to pin 9) and what the value of the resistor would be. Sorry for all of the questions. Thanks in advance.

QuiksilverRox (author)Mdob2009-07-05

I use this to help me with resistors. You'll need a 56ohm resistor. Thats green blue black and attach it to a leg of the Piezo to pin 9 or ground.

Mdob (author)QuiksilverRox2009-07-06

Ok thank you so much! I'll start building it as soon as i get my arduino in a day or two.

ReCreate (author)2009-06-26

This is actually pretty good! I get the code pretty well, I understand it, I will try this when i get my arduino, i am ordering one ;)

blackwellj (author)2009-06-16

code does not work

ReCreate (author)blackwellj2009-06-25

it should, but since you are providing so much information there is just too much we can do to help you.

QuiksilverRox (author)ReCreate2009-06-26

i fixed the code problem. It was missing a "{" at the end.

ReCreate (author)QuiksilverRox2009-06-26

Well then, It was missing the closing bracket? He still should have provided some more information...

hg341 (author)2009-06-04

wow i can now play the trumpet again!!i have played for 4 years but i have braces now

Wafflicious (author)hg3412009-06-05

Ive played for 3 years and got braces last month... I can still play the same

Bartboy (author)Wafflicious2009-06-06

Wait till you take them off.... that's when it gets hard.

Wafflicious (author)Bartboy2009-06-24


hg341 (author)hg3412009-06-04

low c is open btw

reywolf (author)hg3412009-06-14

if you read it says he had to modify it for the programming ;)

hg341 (author)reywolf2009-06-15

yea... i read that right affter i posted that

Damage, Inc. (author)hg3412009-06-05

I played for 2 years, got braces, and started playing again the next day. I can still play higher than some of my fellow band-mates. I do play the trombone, but I can't imagine it makes too much of a difference.

QuiksilverRox (author)hg3412009-06-04

I have braces also and it sucks. I can only reach a high 'C'. (above the staff 'C')

hg341 (author)QuiksilverRox2009-06-05

i haven't played in over a year my band theacher was a b$!@# so i quit (she would always pick on me)

scooterkid92 (author)2009-06-06

I have a few questions: Does that mean it plays constantly until it's turned off? Do you know if an air pressure sensor could be used to make it more realistic?

abadfart (author)scooterkid922009-06-08

i had the same thought

About This Instructable




Bio: I love the TV shows Psych and Monk Bands Relient K and Anberlin destroying things making things swimming and having fun.
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