#include <Adafruit_NeoPixel.h>

// Define pins
#define PIN_NEOPIXEL 21
#define NUMPIXELS 16 // Number of NeoPixels in the ring

// Initialize NeoPixel library
Adafruit_NeoPixel pixels(NUMPIXELS, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);

int distance;

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);

  // Initialize NeoPixel ring
  pixels.begin();
  pixels.show(); // Initialize all pixels to 'off'

  // Print instructions to Serial Monitor
  Serial.println("Enter distance in cm:");
}

void loop() {
  // Check if there is any input from the Serial Monitor
  if (Serial.available() > 0) {
    // Read the input and convert it to an integer
    distance = Serial.parseInt();

    // Print the entered distance to the Serial Monitor
    Serial.print("Entered distance: ");
    Serial.print(distance);
    Serial.println(" cm");

    // Change NeoPixel color based on distance
    if (distance < 10) {
      setRingColor(pixels.Color(255, 0, 0)); // Red for close distances
    } else if (distance < 20) {
      setRingColor(pixels.Color(255, 255, 0)); // Yellow for medium distances
    } else {
      setRingColor(pixels.Color(0, 255, 0)); // Green for far distances
    }

    // Print instructions again for the next input
    Serial.println("Enter distance in cm:");
  }

  delay(100); // Delay for a bit before next loop
}

// Function to set color of the NeoPixel ring
void setRingColor(uint32_t color) {
  for (int i = 0; i < NUMPIXELS; i++) {
    pixels.setPixelColor(i, color);
  }
  pixels.show();
}