potentiometer and neopixel exploration

neopixel_potentiometer.ino

#include <Adafruit_NeoPixel.h>

// constants
#define PIN       1
#define NUMPIXELS 12

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB);

// define colors
uint32_t red = strip.Color(255, 0, 0);
uint32_t orange = strip.Color(255, 50, 0);
uint32_t yellow = strip.Color(255, 255, 0);
uint32_t yellowgreen = strip.Color(210, 255, 0);
uint32_t green = strip.Color(0, 255, 0);

// utility variables
uint8_t mode = 1;
int sensorPin = 1;
int outputValue = 0;

void setup() {
  strip.begin();
  strip.show();
  strip.setBrightness(40);
}

void loop() {
  int i;
  
  // mapping analog value
  outputValue = map(analogRead(sensorPin), 0, 1023, 0, 12);

  // set color neopixel values
  for (i = 0; i < outputValue; i++) {
    if (i < 6) {
      strip.setPixelColor(i, green);
    } else if (i == 6) {
      strip.setPixelColor(i, yellowgreen);
    } else if (i > 6 && i < 9) {
      strip.setPixelColor(i, yellow);
    } else if (i == 9) {
      strip.setPixelColor(i, orange);
    } else {
      strip.setPixelColor(i, red);
    }
  }

  // clear pixel values
  for (i = outputValue; i < NUMPIXELS; i++) {
    strip.setPixelColor(i, 0, 0, 0);
  }
  
  // show your work
  strip.show();
}