From 7c154f79b7cb3b93c9b10204a73c803f6127b2ca Mon Sep 17 00:00:00 2001
From: Molly Nicholas <molecule1985@gmail.com>
Date: Sun, 13 Dec 2015 09:36:59 -0800
Subject: [PATCH] Add version for the Particle Photon

---
 .../cloud-lightning-photon.ino                | 118 ++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 cloud-lightning-photon/cloud-lightning-photon.ino

diff --git a/cloud-lightning-photon/cloud-lightning-photon.ino b/cloud-lightning-photon/cloud-lightning-photon.ino
new file mode 100644
index 0000000..a8de13e
--- /dev/null
+++ b/cloud-lightning-photon/cloud-lightning-photon.ino
@@ -0,0 +1,118 @@
+// This #include statement was automatically added by the Particle IDE.
+#include "neopixel/neopixel.h"
+
+// IMPORTANT: Set pixel COUNT, PIN and TYPE
+#define PIXEL_COUNT 4
+#define PIXEL_PIN D0
+#define PIXEL_TYPE WS2812B
+
+
+// Parameter 1 = number of pixels in strip
+// Parameter 2 = pin number (most are valid)
+//               note: if not specified, D2 is selected for you.
+// Parameter 3 = pixel type [ WS2812, WS2812B, WS2811, TM1803 ]
+//               note: if not specified, WS2812B is selected for you.
+//               note: RGB order is automatically applied to WS2811,
+//                     WS2812/WS2812B/TM1803 is GRB order.
+//
+// 800 KHz bitstream 800 KHz bitstream (most NeoPixel products ...
+//                         ... WS2812 (6-pin part)/WS2812B (4-pin part) )
+//
+// 400 KHz bitstream (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
+//                   (Radio Shack Tri-Color LED Strip - TM1803 driver
+//                    NOTE: RS Tri-Color LED's are grouped in sets of 3)
+
+Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);
+
+const int HIGH_STRIKE_LIKELIHOOD = 5;
+const int LOW_STRIKE_LIKELIHOOD = 10;
+int currentDataPoint = 0;
+int chance = LOW_STRIKE_LIKELIHOOD;
+
+// Simple moving average plot
+int NUM_Y_VALUES = 17;
+
+float yValues[] = {
+  0,
+  7,
+  10,
+  9,
+  7.1,
+  7.5,
+  7.4,
+  12,
+  15,
+  10,
+  0,
+  3,
+  3.5,
+  4,
+  1,
+  7,
+  1
+};
+
+float simple_moving_average_previous = 0;
+float random_moving_average_previous = 0;
+
+void setup() {
+
+    strip.begin(); // Sends the start protocol for the LEDs.
+    strip.show(); // Initialize all pixels to 'off'
+    
+    Particle.function("lightning", triggerWeather);
+}
+
+void loop() {
+
+}
+
+int triggerWeather(String command) {
+    
+    if (command==String("f")) {
+        int led = random(PIXEL_COUNT);
+        for (int i = 0; i < 10; i++) {
+        // Use this line to keep the lightning focused in one LED.
+        // lightningStrike(led):
+        // Use this line if you want the lightning to spread out among multiple LEDs.
+        lightningStrike(random(PIXEL_COUNT));
+        }
+        // Once there's been one strike, I make it more likely that there will be a second.
+        chance = HIGH_STRIKE_LIKELIHOOD;
+    } else {
+        chance = LOW_STRIKE_LIKELIHOOD;
+    }
+  turnAllPixelsOff();
+  delay(1000);
+}
+
+void turnAllPixelsOff() {
+  for (int i = 0; i < PIXEL_COUNT; i++) {
+    strip.setPixelColor(i, 0);
+  }
+  strip.show();
+}
+
+void lightningStrike(int pixel) {
+  float brightness = simple_moving_average();
+  float scaledWhite = abs(brightness*500);
+  
+  strip.setPixelColor(pixel, strip.Color(scaledWhite, scaledWhite, scaledWhite));
+  strip.show();
+  delay(random(5, 100));
+  currentDataPoint++;
+  currentDataPoint = currentDataPoint%NUM_Y_VALUES;
+}
+
+
+// https://en.wikipedia.org/wiki/Moving_average#Simple_moving_average
+float simple_moving_average() {
+  uint32_t startingValue = currentDataPoint;
+  uint32_t endingValue = (currentDataPoint+1)%NUM_Y_VALUES;
+  float simple_moving_average_current = simple_moving_average_previous + 
+                                  (yValues[startingValue])/NUM_Y_VALUES - 
+                                  (yValues[endingValue])/NUM_Y_VALUES;
+
+  simple_moving_average_previous = simple_moving_average_current;
+  return simple_moving_average_current;
+}