I am trying to get the mp3 shield to play when the piezo element senses vibration and this code does that but only for a quick second rather than for 1min 30 seconds like its supposed to. It shows error code 1. Can anyone help?
/**
Sketch assumes you have MP3 files with filenames like "track001.mp3",
"track002.mp3", etc on an SD card loaded into the shield.
*/
#include <SPI.h>
//Add the SdFat Libraries
#include <SdFat.h>
#include <FreeStack.h>
//and the MP3 Shield Library
#include <SFEMP3Shield.h>
// Below is not needed if interrupt driven. Safe to remove if not using.
#if defined(USE_MP3_REFILL_MEANS) && USE_MP3_REFILL_MEANS == USE_MP3_Timer1
#include <TimerOne.h>
#elif defined(USE_MP3_REFILL_MEANS) && USE_MP3_REFILL_MEANS == USE_MP3_SimpleTimer
#include <SimpleTimer.h>
#endif
SdFat sd; //SD object
SFEMP3Shield MP3player; //Shield object
unsigned long startPlay; //This stores the last millisecond since we had a vibration
//const unsigned int playTime = 90000;//seconds * 1000 length of play in milliseconds
const long playTime = 90000;//seconds * 1000 length of play in milliseconds
int vibration = -1;
const int knockSensor = A0; // the piezo is connected to analog pin 0
const int threshold = 100; // threshold value to decide when the detected sound is a knock or not
// these variables will change:
int sensorReading = 0; // variable to store the value read from the sensor pin
char trackName[] = "track001.mp3";
uint8_t result; //result code from some function as to be tested at later time.
void setup() {
Serial.begin(115200);
Serial.print(F("F_CPU = "));
Serial.println(F_CPU);
Serial.print(F("Free RAM = "));
Serial.print(FreeStack(), DEC); // FreeStack() is provided by SdFat
Serial.println(F(" Should be a base line of 1028, on ATmega328 when using INTx"));
//Initialize the SdCard.
if (!sd.begin(SD_SEL, SPI_FULL_SPEED)) sd.initErrorHalt();
if (!sd.chdir("/")) sd.errorHalt("sd.chdir");
//Initialize the MP3 Player Shield
result = MP3player.begin();
//check result, see readme for error codes.
if (result != 0) {
Serial.print(F("Error code: "));
Serial.print(result);
Serial.println(F(" when trying to start MP3 player"));
if ( result == 6 ) {
Serial.println(F("Warning: patch file not found, skipping.")); // can be removed for space, if needed.
Serial.println(F("Use the "d" command to verify SdCard can be read")); // can be removed for space, if needed.
}
}
}
void loop() {
// Below is only needed if not interrupt driven. Safe to remove if not using.
#if defined(USE_MP3_REFILL_MEANS)
&& ( (USE_MP3_REFILL_MEANS == USE_MP3_SimpleTimer)
|| (USE_MP3_REFILL_MEANS == USE_MP3_Polled) )
MP3player.available();
#endif
while (vibration == -1)
{
sensorReading = analogRead(knockSensor);
// if the sensor reading is greater than the threshold:
if (sensorReading >= threshold) {
startPlay = millis();
playAction(1);
vibration = 1;
}
}
//check if sufficient
while (vibration == 1) {
if (millis() - startPlay > playTime) {
sensorReading = analogRead(knockSensor);
/*
there is still vibration,restart playback and reset timer
/
if (sensorReading >= threshold) {
startPlay = millis();
playAction(1);
}
}
/
no vibration, pause playing, reset sentinel
*/
else {
vibration = -1;
playAction(2);
}
delay(100);
}
}
/**
\1 to play 2 to pause
*/
void playAction(int command) {
if (command == 1) {
//create a string with the filename
//tell the MP3 Shield to play that file
result = MP3player.playMP3(trackName);
//check result, see readme for error codes.
if (result != 0) {
Serial.print(F("Error code: "));
Serial.print(result);
Serial.println(F(" when trying to play track"));
}
/* Display the file on the SdCard */
} else {
if ( MP3player.getState() == playback) {
MP3player.pauseMusic();
Serial.println(F("Pausing"));
} else {
Serial.println(F("Not Playing!"));
}
}