Control audio from micro SD with LDR

hey everyone,

i'm working on interactive installation , need coding part.

i bought vs1053 shield, connected arduino uno written in this tutorial.
i used player_simple code library , add ldr part. idea take value ldr , check if smaller 150. if > play track 1, , if not > pause track 1. problem when sensor got smaller value , audio starts, sensor stop reading next values.... , audio played until track on , after continues read next values.

i want find way while audio plays, sensor still reads values , in moment got higher value pause audio.

this got far... maybe if statement not 1 need use (i'm not sure). tried while , do..while still nothing:

code: [select]

void loop() {

//check ldr value
  val1 = analogread(ldr1);           
  serial.print("sensor1 = " );                       
  serial.println(val1);
  delay(1000);
 
 //if
  if (val1 < 150){
  serial.println(f("playing track 001"));
  musicplayer.playfullfile("track0~1.mp3");
  //play file in background, requires interrupts!
  //serial.println(f("playing track 002"));
  //musicplayer.startplayingfile("track0~2.mp3");
       
  }else{
    musicplayer.pauseplaying(true);
}
 
  delay(100);
}

can suggest something?

what if replace

code: [select]

musicplayer.playfullfile("track0~1.mp3");
that blocks until track played, with

code: [select]

musicplayer.startplayingfile("track0~1.mp3");
see 'player_interrupts.ino' demo see how.

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