added javascript version of LED blink

project01/testwiringpi.js

@@ -0,0 +1,29 @@
+// blink an LED with JavaScript.
+//
+// requires the following:
+//   nodejs as a container to run in
+//      should already be in the Raspbian image
+//   npm to install the onoff library
+//      sudo apt-get install npm
+//   onoff to interface with the GPIO board
+//      sudo npm install onoff
+
+// a simple and brute force sleep function that
+// Javascript does not have as a built-in.
+function sleep(delay) {
+  var start = new Date().getTime();
+  while (new Date().getTime() < start + delay);
+}
+
+var Gpio = require('onoff').Gpio;
+var LED = new Gpio(17, 'out');     // use BCM pin numbering, not wiringPi
+
+// a loop to blink the LED 10 times.
+for (i=0; i < 10; i++) {
+  LED.writeSync(0);
+  sleep (1000);
+  LED.writeSync(1);
+  sleep (1000);
+}
+
+LED.unexport();