SCRIPT Coding Arduino
/* ---------------------------------
Pendeteksi Asap dan Gas Berbasis Arduino dengan Menggunanakan Sensor
MQ-2
--------------------------------- */
const int led_merah = 12;
const int buzzer = 11;
const int sensor = 0;
const int BATAS = 90;
int length = 15; // the number of
notes
char notes[] = "ccggaagffeeddc
"; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2,
1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 300;
void playTone(int tone, int duration)
{
for (long i = 0; i < duration * 1000L; i += tone * 2) {
digitalWrite(buzzer, HIGH);
delayMicroseconds(tone);
digitalWrite(buzzer, LOW);
delayMicroseconds(tone);
}
}
void playNote(char note, int
duration) {
char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
// play the tone corresponding to the note name
for (int i = 0; i < 8; i++) {
if (names[i] == note) {
playTone(tones[i], duration);
}
}
}
void setup()
{
pinMode(led_merah, OUTPUT);
pinMode(buzzer,OUTPUT);
Serial.begin(9600) ;
}
void loop()
{
int a0 = analogRead(sensor);
Serial.println(a0);
if (a0 >= BATAS)
{
digitalWrite(led_merah, HIGH);
delay(500);
digitalWrite(led_merah, LOW);
delay(500);
for (int i = 0; i < length; i++) {
if (notes[i] == ' ') {
delay(beats[i] * tempo); // rest
} else {
playNote(notes[i], beats[i] * tempo);
}
// pause between notes
delay(tempo / 1);
}
}
else
delay(500);
}
