#include <Adafruit_NeoPixel.h>
#define Din_PIN 10
#define NUMPIXELS 16
Adafruit_NeoPixel pixels (NUMPIXELS, Din_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(9600);
  pixels.begin();
  pixels.clear();
  pixels.show();
}

#define TRIG_PIN1 9
#define ECHO_PIN1 8

float readDistance(int TRIG_PIN, int ECHO_PIN) {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2 ;
  return distance ;
}

void loop() {
  float dist = readDistance(TRIG_PIN1, ECHO_PIN1);
  Serial.println("Distance: " + String(dist) + "cm");
  delay(100);
  pixels.clear();
  for (int i = 0; i < dist / (400 / 16)  ; i++) {
    pixels.setPixelColor(i, pixels.Color(255, 0, 255));
  }
  pixels.show();
  // if (dist1 < 200)
  // {
  //   for (int i = 0; i < NUMPIXELS; i++) {
  //     pixels.setPixelColor(i, pixels.Color(255, 0, 255));
  //   }
  //   pixels.show();
  // }
  // else
  // {
  //   for (int i = 0; i < NUMPIXELS; i++) {
  //     pixels.setPixelColor(i, pixels.Color(255, 255, 0));
  //   }
  //   pixels.show();
  // }
}