#include <FastLED.h>

#define NUM_LEDS 5
#define LED_PIN  15

const int potPin = 13,
          switchPin = 27;
int currentLEDS = 0,
    lastLEDS = 0;

CRGB leds[NUM_LEDS];

void IRAM_ATTR function_ISR() {
  // currentLEDS = analogRead(potPin);
  // currentLEDS = map(currentLEDS, 0, 4095, 0, 225);

  // FastLED.clear();
  // for (int led = 0; led < currentLEDS; led + 2) {
  //   leds[led] = CRGB::CRGB::Orange;
  // }
  // lastLEDS = currentLEDS;
  // FastLED.show();
  if (digitalRead(switchPin) == HIGH) {
    FastLED.clear();
    digitalWrite(2, HIGH);
    for (int led = 0; led < NUM_LEDS; led ++) {
      leds[led] = CRGB::Orange;
    }
    FastLED.show();
  }
  else {
    FastLED.clear();
    FastLED.show();

    digitalWrite(2, LOW);
  };
}



void setup() {
  // analogReadResolution(10);
  FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUM_LEDS);
  pinMode(switchPin, INPUT_PULLDOWN);
  attachInterrupt(switchPin, function_ISR, CHANGE);
  pinMode(2, OUTPUT);
}
void loop() {
}