Improved sysfs file access code

examples/rf-remote.php

@@ -2,6 +2,21 @@
 
 require_once __DIR__."/../vendor/autoload.php";
 
+/* 
+ * This example demonstrates using a 4-button wireless remote control with the
+ * GPIO, in this case with the pins mapped against WiringPi for a Rev2 board.
+ * If you are using this code with any other hardware, please update the mapper
+ * below.
+ *
+ * It is assumed that Pin 0 is the interrupt pin (VT) to signal when a button
+ * press has been received, and Pin 1-4 are connected to the pins for button
+ * A to D on the remote control.
+ *
+ * Note that the Raspberry Pi GPIO is not 5V tolerant, so use an optoisolator
+ * or transistors to ensure that you don't zap your preciouos hardware.
+ *
+ */
+
 use NoccyLabs\Gpio\Gpio;
 use NoccyLabs\Gpio\GpioMapper\WiringPiMapper;
 
@@ -21,7 +36,12 @@ $led = $gpio[0]
     ->setDirection("input")
     ->setEdge("rising")
     ->setHandler(function($e) use($gpio) {
-        
+            if ($gpio[1]->getValue()) { echo "A"; }
+        elseif ($gpio[2]->getValue()) { echo "B"; }
+        elseif ($gpio[3]->getValue()) { echo "C"; }
+        elseif ($gpio[4]->getValue()) { echo "D"; }
+        else { echo "None"; }
+        echo "\n";
     })
     ->setLabel("rfint")
     ->dumpStatus(true);
@@ -33,3 +53,7 @@ for($n = 1; $n < 5; $n++) {
         ->dumpStatus(true);
 }
 
+while(true) {
+    $gpio->refresh();
+    usleep(10000);
+}