// Project: LED Control with LCD and NeoPixel Ring
// Author: Arvind Patil
// Date: 9th July 2023

#include <Wire.h>           // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library for LCD

#include <Adafruit_NeoPixel.h> // Library for NeoPixel

#define LED_PIN 2           // Pin for controlling LED
#define NEOPIXEL_PIN 4      // Pin for controlling NeoPixel ring
#define NUM_PIXELS 12       // Number of NeoPixels in the ring

LiquidCrystal_I2C lcd(0x27, 20, 4);  // LCD object with I2C address 0x27

Adafruit_NeoPixel pixels(NUM_PIXELS, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  lcd.begin(20, 4);     // Initialize the LCD
  lcd.print("LED Control"); // Print initial text on LCD
  lcd.setCursor(0, 2);
  lcd.println("action on lcd ");
  
  lcd.setCursor(9, 3);
  lcd.print("by Arvind ");

  pinMode(LED_PIN, OUTPUT);       // Set LED pin as OUTPUT
  pixels.begin();                 // Initialize the NeoPixel ring
  pixels.setBrightness(250);       // Set NeoPixel brightness (0-255)
  pixels.show();                  // Update NeoPixel ring
}

void loop() {
  digitalWrite(LED_PIN, HIGH);    // Turn LED on
  lcd.setCursor(0, 1);
  lcd.print("LED ON     ");

  rainbowChase(50, 100);          // Run the rainbow chase effect
  delay(2000);                    // Delay 1 second

  digitalWrite(LED_PIN, LOW);     // Turn LED off
  lcd.setCursor(0, 1);
  lcd.print("LED OFF    ");

  rainbowChase(50, -100);         // Run the reverse rainbow chase effect
  delay(2000);                    // Delay 1 second

 

}

// Function to perform a rainbow chase effect on the NeoPixel ring
void rainbowChase(uint8_t wait, int8_t direction) {
  for (int i = 0; i < NUM_PIXELS; i++) {
    pixels.setPixelColor((i + direction) % NUM_PIXELS, pixels.ColorHSV(i * 65536 / NUM_PIXELS));
    pixels.show();
    delay(wait);
    pixels.setPixelColor((i + direction) % NUM_PIXELS, 0);
  }
}