#include <FastLED.h>

#define NUM_LEDS 10
#define LED_PIN 26
#define PIR_PIN 13

CRGB leds[NUM_LEDS];

int motion_detected = false;

void setup() {
  Serial.begin(115200);

  pinMode(PIR_PIN, INPUT);

  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);
  setLeds(CRGB::Black);
}

void loop() {
  int read_state = digitalRead(PIR_PIN);

  if (read_state == HIGH) {
    Serial.println("Motion detected");

    if (motion_detected == false) {
      setLeds(CRGB::Red);

      motion_detected = true;
    }
  } else {
    Serial.println("No motion detected");

    if (motion_detected == true){
      setLeds(CRGB::Black);

      motion_detected = false;
    }
  }

  delay(100);
}

void setLeds(CRGB color) {
  for(int i = 0; i < NUM_LEDS; i++) {
    leds[i] = color;
  }
  FastLED.show();
}