#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
#define TRIG_PIN2 7
#define ECHO_PIN2 6

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 dist1 = readDistance(TRIG_PIN1, ECHO_PIN1);
  Serial.print("Distance1: ");
  Serial.print(dist1);
  float dist2 = readDistance(TRIG_PIN2, ECHO_PIN2);
  Serial.print("\t Distance2: ");
  Serial.println(dist2);
  delay(100);
  pixels.clear();
  if (dist1 < 200)
  {
    for (int i = NUMPIXELS / 2; i < NUMPIXELS; i++) {
      pixels.setPixelColor(i, pixels.Color(255, 0, 255));
    }
    pixels.show();
  }
  else
  {
    for (int i = NUMPIXELS / 2; i < NUMPIXELS; i++) {
      pixels.setPixelColor(i, pixels.Color(255, 255, 0));
    }
    pixels.show();
  }
  if (dist2 < 200)
  {
    for (int i = 0; i < NUMPIXELS / 2; i++) {
      pixels.setPixelColor(i, pixels.Color(255, 0, 255));
    }
    pixels.show();
  }
  else
  {
    for (int i = 0; i < NUMPIXELS / 2; i++) {
      pixels.setPixelColor(i, pixels.Color(255, 255, 0));
    }
    pixels.show();
  }
}