runlight.ino

// #define FASTLED_ESP8266_D1_PIN_ORDER
//#define FASTLED_ESP8266_NODEMCU_PIN_ORDER
// #define FASTLED_ESP8266_RAW_PIN_ORDER
// #include <FastLED.h>
#include <NeoPixelBus.h>
#include <unordered_set>

#define LED_PIN     D7
#define NUM_LEDS    50
#define STEP        1
#define MAX_BRIGHT  256 //32

RgbColor leds[NUM_LEDS];
RgbColor target[NUM_LEDS];

NeoPixelBus<NeoGrbFeature, NeoEsp8266DmaWs2812xMethod> strip(NUM_LEDS);
using namespace std;

unordered_set<int> branches = {
    6, 7, 8, 12, 13, 17, 18, 19, 22, 23, 27, 28, 31, 32, 33, 37, 38, 42, 43, 44
};
unordered_set<int> trunk = {
    3, 4, 5, 45, 46, 47
};

int rcolor(int low, int high, int bright) {
    if (low > high)
        low = 0;
    if (high > 255)
        high = 255;
    bright = min(bright, MAX_BRIGHT);
    return random(low, high) * bright / 255;
}

void gen_led(int i) {
    int r, g, b, bright;
    if (branches.count(i)) {
        bright = random(0, 256);
        r = rcolor(0, 32, bright);
        g = rcolor(200, 255, bright);
        b = rcolor(0, 32, bright);
    } else if (trunk.count(i)) {
        bright = random(0, 256);
        r = rcolor(60, 80, 255);
        g = rcolor(20, 30, 255);
        b = rcolor(0, 10, 255);
    } else {
        bright = random(0, 256);
        r = rcolor(200, 255, bright);
        g = rcolor(0, 64, bright);
        b = rcolor(0, 32, bright);
    }
    target[i] = RgbColor(r, g, b);
}

void adjust(int led) {
    auto adjust1 = [](uint8_t& actual, uint8_t desired) {
        if (actual == desired)
            return;
        uint8_t diff = max(desired, actual) - min(desired, actual);
        if (diff <= STEP)
            actual = desired;
        else if (actual > desired)
            actual -= STEP;
        else
            actual += STEP;
    };
    adjust1(leds[led].R, target[led].R);
    adjust1(leds[led].G, target[led].G);
    adjust1(leds[led].B, target[led].B);
}

void setup() {
    strip.Begin();
    randomSeed(analogRead(0));
    for (int i = 0; i < NUM_LEDS; i++) {
        gen_led(i);
        leds[i] = target[i];
        strip.SetPixelColor(i, leds[i]);
    }
}

void loop() {
    for (int i = 0; i < 2; i++)
       gen_led(random(NUM_LEDS));

    for (int i = 0; i < NUM_LEDS; i++) {
        adjust(i);
        strip.SetPixelColor(i, leds[i]);
    }
    strip.Show();

    delay(10);
}