Arduino Week 10 Lesson

We are combining Water sensor and passive buzzer. We are sounding an alarm based on water detected by the water sensor.

#define c 3830 // 261 Hz
#define d 3400 // 294 Hz
#define e 3038 // 329 Hz
#define f 2864 // 349 Hz
#define g 2550 // 392 Hz
#define a 2272 // 440 Hz
#define b 2028 // 493 Hz
#define C 1912 // 523 Hz
// Define a special note, ‘R’, to represent a rest
#define R 0

int speakerOut = 9;
// Do we want debugging on serial out? 1 for yes, 0 for no
int DEBUG = 0;

void setup() {
pinMode(speakerOut, OUTPUT);

Serial.begin(9600); // Set serial out if we want debugging

}

// MELODY and TIMING =======================================
// melody[] is an array of notes, accompanied by beats[],
// which sets each note’s relative length (higher #, longer note)
int melody[] = { C, C, b, g, C, a, R, g, b, g, a, C };
int beats[] = { 32, 16, 16, 8, 8, 16, 32, 16, 16, 16, 8, 8 };
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 = 100; //<-BLETCHEROUS HACK; See NOTES

// Initialize core variables
int tone_ = 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 (tone_ > 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(tone_ / 2);

// DOWN
digitalWrite(speakerOut, LOW);
delayMicroseconds(tone_ / 2);

// Keep track of how long we pulsed
elapsed_time += (tone_);
}
}
else { // Rest beat; loop times delay
for (int j = 0; j < rest_count; j++) { // See NOTE on rest_count
delayMicroseconds(duration);
}
}
}

// LET THE WILD RUMPUS BEGIN =============================
void loop() {
// Set up a counter to pull from melody[] and beats[]
int sensor=analogRead(A1); // Incoming analog signal read and appointed sensor
Serial.println(sensor);
if (sensor > 200)
{
for (int i=0; i<MAX_COUNT; i++) {
tone_ = melody[i];
beat = beats[i];

duration = beat * tempo; // Set up timing

playTone();
// A pause between notes…
delayMicroseconds(pause);

Serial.print(i);
Serial.print(“:”);
Serial.print(beat);
Serial.print(” “);
Serial.print(tone_);
Serial.print(” “);
Serial.println(duration);

}
}
}