Added siren example

firmware/examples/LED-Siren/.vscode/arduino.json

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+{
+    "board": "espressif:esp32:nina_w10",
+    "configuration": "UploadSpeed=115200",
+    "port": "/dev/ttyUSB0",
+    "sketch": "LED-Siren.ino"
+}

firmware/examples/LED-Siren/.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+            ],
+            "browse": {
+                "limitSymbolsToIncludedHeaders": false,
+                "path": [
+                    "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+                ]
+            },
+            "intelliSenseMode": "clang-x64",
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17"
+        }
+    ],
+    "version": 4
+}

firmware/examples/LED-Siren/LED-Siren.ino

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+/* 
+* LED siren example for MakeZurich badge 2018
+*/
+
+#include "FastLED.h"
+
+#define NUM_LEDS 2
+#define DATA_PIN 27 // GPIO18
+
+// Delays used inside siren algorithm
+#define SHORT_DELAY 200
+#define LONG_DELAY  1000
+
+// Define the array of leds
+CRGB leds[NUM_LEDS];
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("\n\nSiren example");
+  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
+}
+
+void loop() {
+  siren();
+  ledOff();
+  delay(1000);
+}
+
+void siren() {
+  // This will flash the leds 10 times from red to blue slowly (each on its side and the other off)
+  for(int i = 0; i <= 10; i++) {
+    showRedBlack(LONG_DELAY);
+    showBlackBlue(LONG_DELAY);
+  }
+
+  // This will flash each side multiple times fast but switch between the two with the same pace
+  for(int i = 0; i <= 10; i++) {
+    for(int j = 0; j <= 5; j++) {
+      showRedBlack(SHORT_DELAY);
+    }
+    for(int j = 0; j <= 5; j++) {
+      showBlackBlue(SHORT_DELAY);
+    }
+  }
+
+  // This will flash quickly between both LEDs
+  for(int i = 0; i <= 30; i++) {
+    showRedBlack(SHORT_DELAY);
+    showBlackBlue(SHORT_DELAY);
+  }
+
+}
+
+void ledOff() {
+  leds[0] = CRGB::Black;
+  leds[1] = CRGB::Black;
+  FastLED.show();
+}
+
+
+void showRedBlack(int delayTime) {
+  leds[0] = CRGB::Red;
+  leds[1] = CRGB::Black;
+  FastLED.show();
+  delay(delayTime);
+}
+
+void showBlackBlue(int delayTime) {
+  leds[0] = CRGB::Blue;
+  leds[1] = CRGB::Black;
+  FastLED.show();
+  delay(delayTime);
+}

firmware/examples/LED-Siren/README.md

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+# LED Siren example
+
+Just flashes different patterns that mimik a US police siren with red and blue on the MakeZurich badge 2018