#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN            6
#define NUMPIXELS      16

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define PIN_R 2
#define PIN_G 3
#define PIN_B 4
int red_in;
int green_in;
int blue_in;

void setup() {
  // This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny85__)
  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
  // End of trinket special code

  pixels.begin(); // This initializes the NeoPixel library.
}

void loop() {
  red_in = digitalRead(PIN_R);
  green_in = digitalRead(PIN_G);
  blue_in = digitalRead(PIN_B);

  for(int i=0;i<NUMPIXELS;i++){
    pixels.setPixelColor(i, pixels.Color(150*red_in, 150*green_in, 150*blue_in));
    pixels.show(); // This sends the updated pixel color to the hardware.
  }
}