#include <Adafruit_NeoPixel.h>
int pin1=9;
int pin2=A0;
int n_leds=16;
Adafruit_NeoPixel ring= Adafruit_NeoPixel(n_leds, pin1);
int v=0;
void setup() {
  // put your setup code here, to run once:
  ring.begin();
  Serial.begin(9600);
}
int set_color(uint32_t color){
  for(int i=0; i<n_leds; i++) {
    ring.setPixelColor(i, color);
    ring.show();
    delay(1000);
  }
}
void loop() {
  // put your main code here, to run repeatedly:
  v=analogRead(pin2);
  Serial.println(v);
  if(v>1000) {
    Serial.println("red");
    set_color(ring.Color(255,0,0));
  }
  else if(v>500) {
    Serial.println("yellow");
    set_color(ring.Color(255,255,0));
  }
  else {
    Serial.println("purple");
    set_color(ring.Color(255,0,255));
  }
}