first commit

Software/NodeJS/libs/sensors/ultrasonicDigitalSensor.js

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+var DigitalSensor = require('./base/digitalSensor')
+var commands     = require('../commands')
+
+function UltrasonicDigitalSensor(pin) {
+  DigitalSensor.apply(this, Array.prototype.slice.call(arguments))
+}
+UltrasonicDigitalSensor.prototype = new DigitalSensor()
+
+UltrasonicDigitalSensor.prototype.read = function() {
+  var write = this.board.writeBytes(commands.uRead.concat([this.pin, commands.unused, commands.unused]))
+  if (write) {
+    this.board.wait(200)
+    this.board.readByte()
+    var bytes = this.board.readBytes()
+    if (bytes instanceof Buffer)
+      return (bytes[1] * 256 + bytes[2])
+    else
+      return false
+  } else {
+    return false
+  }
+}
+
+module.exports = UltrasonicDigitalSensor