Hexagon Sigil Arduino Code

sigilpack.cpp

#include <Adafruit_NeoPixel.h>

// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1:
#define LED_PIN  7
 
// How many NeoPixels are attached to the Arduino?
#define LED_COUNT 2

// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_RGB + NEO_KHZ800);

bool down = false;
unsigned int w_min= 1;
unsigned int w_max = 254;
unsigned int w_speed = 24;
unsigned int j = w_min;

struct rgb {
  unsigned char r = 0, g = 0, b = 0;
} rgb_t;


int i = 0;
double bv = 0.0;

rgb wheel(unsigned int);

void setup() {
  Serial.begin(9600);
  
  // put your setup code here, to run once:
  strip.setBrightness(128);
  j = (w_max - w_min) / 2;
  rgb origin = wheel(w_min);
  for (i = 0; i < LED_COUNT; i++) {
    strip.setPixelColor(i, origin.r, origin.g, origin.b);
  }
  strip.show(); // Initialize all pixels to 'off'
  strip.begin();
  
  pinMode(A0, INPUT);
  
  double value = 0.0;
  for (i; i < 4; i++) {
    delay(50);
    value += (double)analogRead(A0);
  }

  value = (value / 4);
  bv = 100 * (value / 1024.0);
    
  if (bv <= 25) {
    w_min = 1;
    w_max = 22;
    w_speed = 50;
  }
}

rgb wheel(unsigned int j){
  unsigned int wp = 255 - j;
  rgb resp;
  
  if (wp < 85) {
    resp.r = 255 - (wp * 3);
    resp.g = 0;
    resp.b = wp * 3;
  } else if (wp < 170) {
    wp -= 85;
    resp.r = 0;
    resp.g = wp * 3;
    resp.b = 255 - wp * 3;
  } else {
    wp -= 170;
    resp.r = wp * 3;
    resp.g = 255 - wp * 3;
    resp.b = 0;
  }
  return resp;
}

void loop() {
  if (j < w_min) {
    down = false;
    j = w_min;
  }
  else if (j > w_max) {
    j = w_max;
    down = true;
  }

  if (down) --j;
  else ++j;

  rgb colors = wheel(j);
  for (i = 0; i < LED_COUNT; i++) {
    strip.setPixelColor(i, colors.r, colors.g, colors.b);
  }
  
  strip.setBrightness(128 + 32);
  
  strip.show(); // Update
  delay(w_speed);
}