First project: Motion activated random mp3 player

Forum 2005-2010 (read only) General Exhibition
2

#include <SoftwareSerial.h>

/*
Random Sound Player
By biocow
November 2010
*/

int distanceVal;

const int numReadings = 10;

int readings[numReadings]; // the readings from the analog input
int index = 0; // the index of the current reading
int total = 0; // the running total
int average = 0; // the average

int inputPin = A5;

void setup() {
// initialize the digital pin as an output:
pinMode(6, OUTPUT); // On, Play and pause
pinMode(7, OUTPUT); // Forward track
pinMode(0, INPUT); // will listen for the end of the track

for (int thisReading = 0; thisReading < numReadings; thisReading++)
readings[thisReading] = 0;

Serial.begin(9600);
}

void loop() {

// Get the readings from the IR sensor
// and smooth them out.

// subtract the last reading:
total= total - readings[index];
// read from the sensor:
readings[index] = analogRead(inputPin);
// add the reading to the total:
total= total + readings[index];
// advance to the next position in the array:
index = index + 1;

// if we're at the end of the array...
if (index >= numReadings)
// ...wrap around to the beginning:
index = 0;

// calculate the average:
average = total / numReadings;
// send it to the computer (as ASCII digits)
Serial.println(average, DEC);

// is someone there? Let's see

if(average > 30) {

// turn on the MP3 player
Serial.println("turning on player");
digitalWrite(6, HIGH);
delay(1400);
digitalWrite(6, LOW);

// wait for it to power up
delay (4500);

// advance one track to make sure we're at the start of a song
digitalWrite(7, HIGH);
delay(200);
digitalWrite(7, LOW);
delay(900);
Serial.println("advance one track");

// Play the current track
digitalWrite(6, HIGH);
delay(200);
digitalWrite(6, LOW);
Serial.println("Play");

// listen to the current song for a bit
// later we'll wait and listen for the end of the track
delay(5000);
Serial.println("How do you like this song?");
delay(5000);

// pause the song
digitalWrite(6, HIGH);
delay(200);
digitalWrite(6, LOW);
Serial.println("Song is over");

// Advance the tracks a random number of times
for(int x = 1; x <= random(1,7); x++) {
digitalWrite(7, HIGH);
delay(200);
digitalWrite(7, LOW);
delay(1000);
Serial.print("Advance track ");
Serial.print(x);
Serial.println(" time(s)");
}

// delay
delay(700);

// turn off the MP3 player
Serial.println("shutting down");
digitalWrite(6, HIGH);
delay(1400);
digitalWrite(6, LOW);
delay(5000); // give it time to turn off

// Reset all the sensor stuff
average = 0;
total = 0;
for(int l = 0; l < numReadings; l++) {
readings[l] = 0;
}

// wait a good bit of time before we reset
int pause = random(10000,20000);
Serial.print("Pausing for ");
Serial.print(pause / 1000);
Serial.println(" seconds");
delay(pause);

}

}