arduino_led.c

#include <FastLED.h>

#define LED_PIN 7
#define NUM_LEDS 240

CRGB leds[NUM_LEDS];
int offset = 0;

void setup() {
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
}

void rainbow_loop() {
  
  for (int i = 0; i < NUM_LEDS ; ++i) {
    switch ((i + offset) % 7) {
      case 0:
        leds[i] = CRGB(255, 0, 0);
        break;
      case 1:
        leds[i] = CRGB(255, 165, 0);
        break;
      case 2:
        leds[i] = CRGB(255, 255, 0);
        break;
      case 3:
        leds[i] = CRGB(0, 255, 0);
        break;
      case 4:
        leds[i] = CRGB(0, 0, 255);
        break;
      case 5:
        leds[i] = CRGB(75, 0, 130);
        break;
      case 6:
        leds[i] = CRGB(238, 130, 238);
        break;
    }
  }

}

void candy_cane_loop() {
  for (int i = 0; i < NUM_LEDS ; ++i) {
    switch ((i + offset) % 3) {
      case 0:
        leds[i] = CRGB(255, 255, 255);
        break;
      case 1:
        leds[i] = CRGB(255, 0, 0);
        break;
      case 2:
        leds[i] = CRGB(255, 0, 0);
        break;
    }
  }
}

void crazy_loop() {
  for (int i = 0; i < NUM_LEDS ; ++i) {
    leds[i] = CRGB(random(255), random(255), random(255));
  }
}

int snake_length = 10;
int mouse_caught = 0;

void snake_loop() {
  for (int i = 0; i < NUM_LEDS ; ++i) {
    if (i > offset && i < offset + snake_length) {
      if (mouse_caught == 1 && i == offset + snake_length / 2) {
        leds[i] = CRGB::Red;
      } else {
        leds[i] = CRGB::Green;
      }
    } else if (i == offset) {
      leds[i] = CRGB::Blue; // Tail
    } else if (i == offset + snake_length) {
      leds[i] = CRGB::Blue; // Head
    } else if (mouse_caught == 0 && i == offset + snake_length + 5) {
      leds[i] = CRGB::Red;
    } else {
      leds[i] = CRGB::Black;
    }
  }

  if (offset > 100) {
    mouse_caught = 1;
  }
}

void otto_loop() {
  for (int i = 0; i < NUM_LEDS; ++i) {
    leds[i] = CRGB::White;
  }
}

void loop() {
  // rainbow_loop();
  // candy_cane_loop();
  // crazy_loop();
  snake_loop();
  // otto_loop();
  
  FastLED.show();

  delay(20);
  
  offset += 1;

  if (offset >= NUM_LEDS) {
    offset = 0;
    mouse_caught = 0;
  }
}