QRE1113 Line Sensor Breakout - Digital

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi,

I bought a line sensor digital on sparkfun.com (products_id=9454) and a had some problems to read it.

I tried use pulseIn with timeout, but timeout didn't break pulsein. When sensor get a black floor, pulsein didn't return any value and "void loop()" was freezed waiting for value (or timeout, I don't know).

Now I used the code below:

      pinMode( pinLine, OUTPUT );
      digitalWrite( pinLine, HIGH );
      delayMicroseconds( 50 );
      pinMode( pinLine, INPUT );
//      long readLine                  =      pulseIn( pinLine, HIGH, 1000000L ); // wait max for 1 second. 

      long readLine                  =      0;
      while ( digitalRead( pinLine ) == HIGH ) {
            pinLine++;
            if ( pinLine == 15 ) { break; }
            delay( 20 );
      }

In my case, 1 = white and 15 = black.

Someone have another idea to solve this?

Thanks.