Super Mario Speed Tuner
Description
In this assignment I created a ’tempo-tuner’, which speeds up the tempo of the original Super Mario Theme Song. Here I use the potentiometer to speed up the tempo of the song. The song is is adjusted from slow to fast tempo, and the values in between.
I use some of the code from http://www.phys-x.org/rbots/index.php?option=com_content&view=article&id=66:lesson-5-play-melody-with-piezo&catid=41:kits&Itemid=70 to play the song, and then edited the void loop, so it uses the value from the potentiometer.
Challenges
As the tempo of the song depends on many variables (as tempo, duration, beats) in this code, it was hard to figure out which one of these parameters that should be adjusted by the potentiometer. I got help from Laura to figure this out.
Components
· Arduino Uno
· Breadboard
· Potentiometer
· Piezo buzzer
· Resistor (10 ohm)
· Paper / Carton
· Tape
Code
// TONES ==========================================
// Start by defining the relationship between
// note, period, & frequency.
// period is in microsecond so P = 1/f * (1E6)
#define c3 7634
#define d3 6803
#define e3 6061
#define f3 5714
#define g3 5102
#define a3 4545
#define b3 4049
#define c4 3816 // 261 Hz
#define d4 3401 // 294 Hz
#define e4 3030 // 329 Hz
#define f4 2865 // 349 Hz
#define g4 2551 // 392 Hz
#define a4 2272 // 440 Hz
#define a4s 2146
#define b4 2028 // 493 Hz
#define c5 1912 // 523 Hz
#define d5 1706
#define d5s 1608
#define e5 1517
#define f5 1433
#define g5 1276
#define a5 1136
#define a5s 1073
#define b5 1012
#define c6 955
// Define a special note, 'R', to represent a rest
#define R 0
// SETUP ============================================
// Set up speaker on a PWM pin (digital 9, 10 or 11)
int speakerOut = 9;
int potIn = A0;
// Do we want debugging on serial out? 1 for yes, 0 for no
int DEBUG = 1;
void setup() {
pinMode(speakerOut, OUTPUT);
if (DEBUG) {
Serial.begin(9600); // Set serial out if we want debugging
}
}
//super mario theme
//the tones
int melody[] = {e5, e5, R, e5, R, c5, e5, R, g5, R, R, R, g4, R, R, R, c5, R, R, g4, R, R, e4, e4, e4};
//the beats
int beats[] = {16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16 , 16, 16, 16, 16, 16, 16, 8, 16, 8, 16, 16, 16, 16};
int MAX_COUNT = sizeof(melody) / 2; // Melody length, for looping.
// Set overall tempo
long tempo = 10000;
// Set length of pause between notes
int pause = 1000;
// Loop variable to increase Rest length
//int rest_count = 50; //<-BLETCHEROUS HACK; See NOTES
// Initialize core variables
int toneM = 0;
int beat = 0;
long duration = 0;
// PLAY TONE ==============================================
// Pulse the speaker to play a tone for a particular duration
void playTone() {
long elapsed_time = 0;
if (toneM > 0) { // if this isn't a Rest beat, while the tone has
// played less long than 'duration', pulse speaker HIGH and LOW
while (elapsed_time < duration) {
digitalWrite(speakerOut,HIGH);
delayMicroseconds(toneM / 2);
// DOWN
digitalWrite(speakerOut, LOW);
delayMicroseconds(toneM / 2);
// Keep track of how long we pulsed
elapsed_time += (toneM);
}
}
}
// LET THE WILD RUMPUS BEGIN =============================
void loop() {
// Set up a counter to pull from melody[] and beats[]
for (int i=0; i<MAX_COUNT; i++) {
toneM = melody[i];
beat = beats[i];
// get potentiometer input
int tempo = map(analogRead(potIn), 0, 1023, 10000, 10500);
int delayValue = map(analogRead(potIn), 0, 1023, 0, 200);
duration = beat * tempo;
Serial.println(duration);
delay(delayValue);
playTone();
}
}
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