// Neopixel Color Picker
// 11/2/2025

// Turn pot to change color or brightness
// Press button to toggle between color and brightness
// Read HSV or RGB value in Serial Monitor

#include <FastLED.h>
#define LED_PIN 2
#define NUM_LEDS 1
#define BUTTON_PIN 4
#define POT_PIN A0
CRGB leds[NUM_LEDS];
bool modeColor = true; // true = color mode, false = brightness mode
int buttonState; // current stable state
int lastButtonState = HIGH;
unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50;
uint8_t hue = 0;
float brightness = 0.5;

// For change detection (reduce serial spam)
static uint8_t lastHue = 255;
static float lastBrightness = -1.0;

// Smooth potentiometer reading
int readPotSmooth() {
int sum = 0;
for (int i = 0; i < 5; i++) {
sum += analogRead(POT_PIN);
delay(2);
}
return sum / 5;
}

void setup() {
Serial.begin(9600);
FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUM_LEDS);
pinMode(BUTTON_PIN, INPUT_PULLUP);
analogReference(DEFAULT);
FastLED.setBrightness(brightness * 255);
leds[0] = CHSV(hue, 255, 255);
FastLED.show();
Serial.println(F("Arduino Color Picker Example"));
Serial.println(F("Press button to toggle between color and brightness control"));
}

void loop() {
int reading = digitalRead(BUTTON_PIN);
// --- Debounce the button ---
if (reading != lastButtonState) {
lastDebounceTime = millis();
}
if ((millis() - lastDebounceTime) > debounceDelay) {
if (reading != buttonState) {
buttonState = reading;
// Toggle on press (HIGH → LOW)
if (buttonState == LOW) {
modeColor = !modeColor;
Serial.println();
Serial.println(F("--------------------------"));
Serial.print(F("Mode changed to: "));
Serial.println(modeColor ? F("COLOR") : F("BRIGHTNESS"));
Serial.println(F("--------------------------"));
// --- Visual indicator flash ---
if (modeColor) {
// Flash current hue at *full* brightness for visibility
FastLED.setBrightness(255);
leds[0] = CHSV(hue, 255, 255);
} else {
// Flash white at current brightness
FastLED.setBrightness(brightness * 255);
leds[0] = CRGB::White;
}
FastLED.show();
delay(500); // flash duration
// Restore last display
FastLED.setBrightness(brightness * 255);
leds[0] = CHSV(hue, 255, 255);
FastLED.show();
delay(500); // pause so user can notice the change
}
}
}
lastButtonState = reading;

// --- Potentiometer reading (smoothed) ---
int potValue = readPotSmooth();

if (modeColor) {
// Map pot to hue range 0–230 (avoid red wraparound)
hue = map(potValue, 0, 1023, 0, 230);
} else {
// Adjust brightness (8%–100% to keep LED visible)
brightness = map(potValue, 0, 1023, 20, 255) / 255.0;
}

FastLED.setBrightness(brightness * 255);
leds[0] = CHSV(hue, 255, 255);
FastLED.show();

// --- Serial output (only when values change) ---
bool changed = false;
if (modeColor && hue != lastHue) {
lastHue = hue;
changed = true;
} else if (!modeColor && abs(brightness - lastBrightness) > 0.01) {
lastBrightness = brightness;
changed = true;
}

if (changed) {
// Convert HSV to RGB for display
CRGB rgbColor = CHSV(hue, 255, 255);

Serial.print(F("HSV: ("));
Serial.print(hue);
Serial.print(F(", 255, "));
Serial.print((uint8_t)(brightness * 255));
Serial.print(F(") | RGB: ("));
Serial.print(rgbColor.r);
Serial.print(F(", "));
Serial.print(rgbColor.g);
Serial.print(F(", "));
Serial.print(rgbColor.b);
Serial.print(F(") | Brightness: "));
Serial.print((int)(brightness * 100));
Serial.println(F("%"));
}

delay(20);
}