#include <Adafruit_NeoPixel.h>

#define PIN        8
#define NUMPIXELS  1
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 100

void setup() {
  Serial.begin(115200);
  pixels.begin();
}

int lastValue = 0;
void loop() {
  int value = analogRead(4) >> 4;
  if (lastValue != value) {
    Serial.println(value);
    lastValue = value;
  }
  pixels.clear();
  for(int i=0; i<NUMPIXELS; i++) {
    pixels.setPixelColor(i, pixels.Color(value, 0, 0));
    pixels.show(); 
    delay(DELAYVAL);
  }
}