Clapping music with Arduino
This exercise relies on the following topics in C:
- variable types (int, char)
- character arrays (strings)
- loops
- nested loops
Hello world.c
Arduino is C!
#include <stdio.h>
main ()
{
printf("hello world\n");
}
Blink music
void setup() {
pinMode(8, OUTPUT);
for (int i=0; i<1000; i++) {
digitalWrite(8, HIGH);
delay(1);
digitalWrite(8, LOW);
delay(1);
}
}
void loop () {}
change the argument to the delay...
for my refined control, try delayMicroseconds
void setup() {
int x;
// initialize the digital pin as an output:
pinMode(8, OUTPUT);
for (int i=0; i<1000; i++) {
digitalWrite(8, HIGH);
delayMicroseconds(250);
digitalWrite(8, LOW);
delayMicroseconds(250);
}
}
tone
- http://www.arduino.cc/en/Tutorial/Tone
- Starting point is the Example > Digital > toneMelody
void setup() {
tone(8, 500, 100);
delay(100);
tone(8, 600, 100);
delay(100);
tone(8, 700, 100);
delay(100);
tone(8, 800, 100);
delay(100);
tone(8, 900, 100);
delay(100);
}
void loop() {}
Clapping music.c
Now, using a C string with the Clapping music pattern.
int speakerPin = 8;
int thedelay = 100;
// char keycode = 'x';
char pat[] = "x xx xxx xxxx xxxxx ";
int patlen = strlen(pat);
void setup()
{
}
void loop ()
{
int i = 0;
while (i<patlen) {
if (pat[i] == 'x') tone(speakerPin, 400, 10);
delay(thedelay);
i = i+1;
}
// can be written in "shorthand" using the for statement...
/*
for (i=0; i<12; i+=1) {
if (pat[i] == 'x') tone(speakerPin, 400, 10);
delay(thedelay);
}
*/
delay(thedelay*10);
}
char pat[] = "xxx xx x xx ";
void setup() {
int patlen = strlen(pat);
for (int p=0; p<patlen; p++) {
if (pat[p] == 'x') {
tone(8, 500, 10);
}
delay(100);
}
}
void loop () {}
Tone only technically supports playing one tone at a time; how might it be possible to still produce something like the 2 parts necessary for clapping music.