#include <Arduino.h>
#include <FastLED.h>

// --- LED Configuration ---
#define NUM_LEDS 16
#define DATA_PIN 17
#define BRIGHTNESS 64 // Use a moderate brightness for testing (0-255)

// --- Global Variables ---
CRGB leds[NUM_LEDS];

void setup() {
Serial.begin(115200);
delay(1000); // A small delay to let the serial monitor connect
Serial.println("ESP32-S3 FastLED Standalone Test");
Serial.println("Starting left-to-right sweep...");

// Initialize the LED strip
FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, NUM_LEDS);
FastLED.setBrightness(BRIGHTNESS);

// Start with all LEDs off
FastLED.clear();
FastLED.show();
}

void loop() {
// --- SWEEP UP (Green to Red) ---
for (int ledsToLight = 0; ledsToLight <= NUM_LEDS; ledsToLight++) {

// First, clear all LEDs to black
FastLED.clear();

// Then, light up the ones we need for this frame
for (int i = 0; i < ledsToLight; i++) {
  // Map the LED index to a hue from Green (96) to Red (0)
  uint8_t hue = map(i, 0, NUM_LEDS - 1, 96, 0);
  leds[i] = CHSV(hue, 255, 255);
}

FastLED.show();
delay(50); // Controls the speed of the sweep

}

delay(500); // Pause with all LEDs lit red before repeating
}