Added asynchronous non-blocking LED blinking.

This makes use of the Blinker library:
https://github.com/MajenkoLibraries/Blinker

Digispark_Passkey/Digispark_Passkey.ino

@@ -1,9 +1,11 @@
 #include "DigiKeyboard.h"
+#include <Blinker.h>
 #include <ezButton.h>
 
 int ACTION_PIN = 0;
 int LED_PIN = 1;
 
+Blinker blinker(LED_PIN);
 ezButton button(ACTION_PIN);
 
 char *passwords[] = {
@@ -14,10 +16,9 @@ char *passwords[] = {
 };
 
 void setup() {
-  pinMode(LED_PIN, OUTPUT);
-  digitalWrite(LED_PIN, LOW);
-  delay(500);
-  digitalWrite(LED_PIN, HIGH);
+  //pinMode(LED_PIN, OUTPUT);
+  blinker.setDelay(25, 10000);
+  blinker.start();
   //pinMode(ACTION_PIN, INPUT);
   button.setCountMode(COUNT_RISING);
   button.setDebounceTime(0);
@@ -26,6 +27,7 @@ void setup() {
 }
 
 void loop() {
+  blinker.blink();
   button.loop();
 
   /*digitalWrite(LED_PIN, HIGH);

libraries/Blinker/Blinker.cpp

@@ -0,0 +1,44 @@
+#include <Blinker.h>
+
+Blinker::Blinker(int pin) {
+    _blinkPin = pin;
+    _highDelay = 500;
+    _lowDelay = 500;
+    _lastBlink = 0;
+    _blinkState = false;
+    _running = false;
+}
+
+void Blinker::setDelay(uint32_t d) {
+    _highDelay = d;
+    _lowDelay = d;
+}
+
+void Blinker::setDelay(uint32_t h, uint32_t l) {
+    _highDelay = h;
+    _lowDelay = l;
+}
+
+void Blinker::blink() {
+    uint32_t diff = millis() - _lastBlink;
+    uint32_t blinkDelay = _blinkState ? _highDelay : _lowDelay;
+    if (diff >= blinkDelay) {
+        _lastBlink = millis() - (diff - blinkDelay); // Account for any delay in calling blink
+        _blinkState = !_blinkState;
+        if (_running) {
+            digitalWrite(_blinkPin, _blinkState ? HIGH : LOW);
+        }
+    }
+}
+
+void Blinker::start() {
+    pinMode(_blinkPin, OUTPUT);
+    _running = true;
+    _lastBlink = millis();
+}
+
+void Blinker::stop(bool idleState) {
+    _running = false;
+    _blinkState = idleState;
+    digitalWrite(_blinkPin, _blinkState);
+}

libraries/Blinker/Blinker.h

@@ -0,0 +1,28 @@
+#ifndef _BLINKER_H
+#define _BLINKER_H
+
+#if (ARDUINO >= 100)
+# include <Arduino.h>
+#else
+# include <WProgram.h>
+#endif
+
+class Blinker {
+	private:
+        int _blinkPin;
+        uint32_t _highDelay;
+        uint32_t _lowDelay;
+        uint32_t _lastBlink;
+        boolean _blinkState;
+        boolean _running;
+
+	public:
+		Blinker(int pin);
+		void setDelay(uint32_t d);
+		void setDelay(uint32_t h, uint32_t l);
+        void blink();
+        void start();
+        void stop(bool idleState = LOW);
+};
+
+#endif

libraries/Blinker/LICENSE.md

@@ -0,0 +1,30 @@
+
+Copyright (c) 2015, Majenko Technologies
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimer in the documentation and/or
+  other materials provided with the distribution.
+
+* Neither the name of Majenko Technologies nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+

libraries/Blinker/README.md

@@ -0,0 +1,9 @@
+Blinker Library
+===============
+
+This very simple little library will cause an output
+to "blink" - that is repeatedly go HIGH then LOW with a 
+requested delay.
+
+The operation is completely non-blocking, so you can
+blink an output while doing other things.

libraries/Blinker/examples/BlinkTest/BlinkTest.ino

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2015, Majenko Technologies
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * 
+ * * Redistributions in binary form must reproduce the above copyright notice, this
+ *   list of conditions and the following disclaimer in the documentation and/or
+ *   other materials provided with the distribution.
+ * 
+ * * Neither the name of Majenko Technologies nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Blinker.h>
+
+// Most boards have an LED on pin 13.  Let's blink it.
+Blinker blinker(13);
+
+void setup() {
+    // The blinker defaults to 500ms delay, which is a 1 second period blinking.
+    // Let's make it faster - say 250ms delay.
+    blinker.setDelay(250);
+
+    // There is also an asymetric blink delay version which takes two delay values,
+    // one for the ON time and one for the OFF time:
+    // blinker.setDelay(50, 950);
+
+    // Start the blinker blinking.  There's also a blinker.stop() function.
+    blinker.start();
+}
+
+void loop() {
+    // As long as you keep calling this method the output will toggle
+    // with the requested delay.  It's non-blocking so you can do othe
+    // things while blinking.
+    blinker.blink();
+}

libraries/Blinker/library.json

@@ -0,0 +1,13 @@
+{
+  "name": "Blinker",
+  "keywords": "led, blink",
+  "description": "Non-blocking LED blinking class",
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/MajenkoLibraries/Blinker"
+  },
+  "version": "1.0.3",
+  "frameworks": "arduino",
+  "platforms": "*"
+}

libraries/Blinker/library.properties

@@ -0,0 +1,10 @@
+name=Blinker
+version=1.0.4
+author=Matt Jenkins
+maintainer=Matt Jenkins <matt@majenko.co.uk>
+sentence=Blink an output in different patterns
+paragraph=Blinker Library\n===============\n\nThis very simple little library will cause an output\nto "blink" - that is repeatedly go HIGH then LOW with a \nrequested delay.\n\nThe operation is completely non-blocking, so you can\nblink an output while doing other things.\n
+url=https://github.com/MajenkoLibraries/Blinker
+category=Signal Input/Output
+architectures=*
+includes=Blinker.h

libraries/Blinker/uecide.json

@@ -0,0 +1 @@
+{"name":"Blinker","provides":"Blinker.h","license":"LICENSE.md","readme":"README.md","description":"Blink an output in different patterns","category":"IO","subcategory":"Digital","maintainer":"Matt Jenkins <matt@majenko.co.uk>","version":"1.0.4","family":"all","core":"all","install":{"examples":"\/","library.properties":"\/","src":"\/"}}