diff --git a/examples/bitmap.php b/examples/bitmap.php
index 3945f71..3dcd504 100644
--- a/examples/bitmap.php
+++ b/examples/bitmap.php
@@ -20,5 +20,9 @@ for($n = 0; $n < 7; $n++) {
     $par->setGpioPin($n,$gpio[$n]);
 }
 
-$par->write(0xFF);
-$par->write(0x00);
+for($n = 0; $n < 10; $n++) {
+	$par->write(0xFF);
+	usleep(500000);
+	$par->write(0x00);
+	usleep(500000);
+}
diff --git a/lib/GpioPin.php b/lib/GpioPin.php
index f5d2664..ea97252 100644
--- a/lib/GpioPin.php
+++ b/lib/GpioPin.php
@@ -76,7 +76,9 @@ class GpioPin
     
     public function __destruct()
     {
-        fclose($this->fd);
+    	if ($this->fd) {
+	        fclose($this->fd);
+	    }
     }
     
     public function setDirection($direction)