Improved led strip controller

- Faster communication between server and controller
- More robust protocol with start/end characters
- Update rate from client to led strip ~10x faster
- Ack sent from controller to server, server retries if nothing received
- Server automatically flashes led strip controller on launch
- New Christmas and Confetti light modes
- Removed slow rainbow
- Added slider to adjust speed (led refresh rate)
- Minor code-style improvements
- Read serial data using serialEvent(), store in buffer

Light Strip Controller/main/christmas.h

@@ -0,0 +1,41 @@
+#ifndef LIGHT_STRIP_CONTROLLER_CHRISTMAS_H
+
+#define LIGHT_STRIP_CONTROLLER_CHRISTMAS_H
+
+#include "constants.h"
+#include <FastLED.h>
+
+void christmas(CRGB *leds, uint8_t *dat)
+{
+    if (*dat == 0)
+    {
+        // White, Green, White, Red
+        fill_gradient_RGB(leds, 0, CRGB::CadetBlue, NUM_LEDS / 4 - 1, CRGB::Green);
+        fill_gradient_RGB(leds, NUM_LEDS / 4, CRGB::Green, NUM_LEDS / 2 - 1, CRGB::CadetBlue);
+        fill_gradient_RGB(leds, NUM_LEDS / 2, CRGB::CadetBlue, NUM_LEDS / 4 * 3 - 1, CRGB::Red);
+        fill_gradient_RGB(leds, NUM_LEDS / 4 * 3, CRGB::Red, NUM_LEDS - 1, CRGB::CadetBlue);
+        *dat = 1;
+    }
+    else
+    {
+        // save the first element
+        CRGB first = leds[0];
+        // shift every element down one
+        for (int i = 1; i < NUM_LEDS; i++)
+        {
+            leds[i - 1] = leds[i];
+        }
+        // put the first element in the last slot
+        leds[NUM_LEDS - 1] = first;
+    }
+}
+
+uint8_t *init_christmas_dat()
+{
+    uint8_t *dat = (uint8_t *)malloc(sizeof(uint8_t));
+    *dat = 0;
+
+    return dat;
+}
+
+#endif

Light Strip Controller/main/colorpulse.h

@@ -8,7 +8,6 @@
 #define PI 128 // This is with relation to 2pi=256, used by 8-bit FastLED trig funcs
 
 const uint8_t N_OVER_2 = NUM_LEDS / 2;
-const uint16_t PULSE_MAX_RNG_VAL = (uint16_t)(16384.0 * PULSE_FREQUENCY / FRAMES_PER_SECOND);
 const uint8_t A = 255 / NUM_LEDS;
 
 const CRGB BLACK = CRGB(0, 0, 0);

Light Strip Controller/main/confetti.h

@@ -0,0 +1,28 @@
+#ifndef LIGHT_STRIP_CONTROLLER_CONFETTI_H
+
+#define LIGHT_STRIP_CONTROLLER_CONFETTI_H
+
+#include "constants.h"
+#include <FastLED.h>
+
+// Adapted from https://github.com/atuline/FastLED-Demos/blob/master/confetti/confetti.ino
+
+void confetti(CRGB *leds, uint8_t *dat)
+{
+    (void)dat;
+
+    fadeToBlackBy(leds, NUM_LEDS, CONFETTI_DECAY_RATE);     
+    int pos = random16(NUM_LEDS);
+    leds[pos] += CHSV((*dat + random16(256))/4 , CONFETTI_SATURATION, 255);  // 12 bits for hue so that the hue increment isn't too quick.
+    *dat++;
+}
+
+uint8_t *init_confetti_dat()
+{
+    uint8_t *dat = (uint8_t *)malloc(sizeof(uint8_t));
+    *dat = 0;
+
+    return dat;
+}
+
+#endif

Light Strip Controller/main/constants.h

@@ -3,42 +3,50 @@
 #define LIGHT_STRIP_CONTROLLER_CONSTANTS_H
 
 // General Constants
-#define DEBUG true
-#define SERIAL_BAUD_RATE 2400
+#define DEBUG false
+#define SERIAL_BAUD_RATE 115200
+#define BUF_SIZE 32
+
+// Communication Protocol Constants
+#define START_CHAR '['
+#define END_CHAR ']'
+#define BRIGHTNESS_CMD '!'
+#define FPS_CMD '@'
+#define RGB_CMD '#'
 
 // LED Strip Constants
 #define DATA_PIN 3
 #define LED_TYPE WS2813
 #define NUM_LEDS 240
 #define BRIGHTNESS 255
 #define MAX_MILLIAMPS 12000
-#define FRAMES_PER_SECOND 25
 
 // Color Modes
 #define OFF 0
 #define RAINBOW 1
-#define SLOW_RAINBOW 2
+#define CHRISTMAS 2
 #define COLOR_PULSE 3
 #define AMBIANCE 4
+#define CONFETTI 5
 
 #define SOLID_COLOR 255 // Not to be used by client...only internally
 
-// Slow Rainbow Mode Constants
-#define SLOW_RAINBOW_MULTIPLIER 10 // This number is how many times slower \
-                                   // the slow rainbow effect is compared  \
-                                   // to the normal rainbow effect
-
 // Color Pulse Mode Constants
 #define PULSE_FREQUENCY 3               // Frequency for a new pulse in Hz  \
                                         // Will be on average this value... \
                                         // actual pulses will be created using rng
 #define PULSE_MIN_SATURATION 225        // Out of 255
 #define PULSE_INTENSITY 50              // bigger the number, longer the leds stay bright, 0 is no change
-#define PULSE_BACKGROUND_BRIGHTNESS 128 // 0..255
+#define PULSE_BACKGROUND_BRIGHTNESS 80  // 0..255
 
 // Ambiance Mode Constants
 #define AMBIANCE_SATURATION 100
 #define AMBIANCE_CHANGE_RATE 0.03 // Defines the bounds for the random walk
 #define AMBIANCE_MAX_CHANGE_RATE 0.3
 
+// Confetti Mode Constants
+#define CONFETTI_DECAY_RATE 2 // Low values = slower fade
+#define CONFETTI_SATURATION 150
+
+
 #endif