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"
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nmrobotics2 months ago

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

blackcamo5 months ago

Arduino is FUN! and it is cheap now!

Arduino Tech9 months ago
is it a speaker or a buzzer ??

could have more pictures for the wiring?

Maker17212 years ago
Does this project need a breadboard?
hankenstien3 years ago
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.
jonoxer6 years ago
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: http://www.practicalarduino.com/news/id/101
 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.
 @srikarbeechu Have you read the explanation in the book? I can't really help you unless I know what you've tried.
@ 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. 
no0x5 years ago
That's great !
How can we do to have more sound from the piezo ?
Have we to put an amplifier or something else ?
Thanks !
Kulf5 years ago
 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.
mman15065 years ago
don't you need a pull down resistor or somthing 
No vote until I hear it. How do I know if yours even works? Come on just a little blues or some Louie Armstrong.
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)  ReCreate5 years ago
Yah the square wave is kind-of robotic but it gets the job done.
Yeah it sure does ;)
Mdob ReCreate5 years ago
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 Mdob5 years ago
Well then, It works, Just as i thought, Well good luck with that ;)
Istarian6 years ago
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: http://www.arduino.cc/playground/Main/InterfacingWithHardware#Output
Which has some interesting stuff on generating sound or playing it. Also this page: http://www.arduino.cc/en/Tutorial/Melody 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)  Istarian6 years ago
I based mine off the melody example.
Ah, ok. I',m curious why you chose not to have one function and preset tonal values, but rather a function for each sound.
Its more fun the overly complicated way :D
Mdob6 years ago
Um sorry if i'm being a noob but would <a rel="nofollow" href="http://www.dipmicro.com/store/index.php?act=viewProd&productId=767">this</a> piezo work?<br/>
QuiksilverRox (author)  Mdob6 years ago
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.
Now imagine Pumping 5V into that sucker, I guess that the sound level could reach 200DB O_O
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)  Mdob6 years ago
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.
Ok thank you so much! I'll start building it as soon as i get my arduino in a day or two.
ReCreate6 years ago
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 ;)
blackwellj6 years ago
code does not work
it should, but since you are providing so much information there is just too much we can do to help you.
QuiksilverRox (author)  ReCreate6 years ago
i fixed the code problem. It was missing a "{" at the end.
Well then, It was missing the closing bracket? He still should have provided some more information...
hg3416 years ago
wow i can now play the trumpet again!!i have played for 4 years but i have braces now
Ive played for 3 years and got braces last month... I can still play the same
Wait till you take them off.... that's when it gets hard.
hg341 hg3416 years ago
low c is open btw
reywolf hg3416 years ago
if you read it says he had to modify it for the programming ;)
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