#include <Adafruit_NeoPixel.h>
#include "esp_sleep.h"
#include "driver/gpio.h"

constexpr gpio_num_t WAKEUP_PIN{ GPIO_NUM_0 };

constexpr byte RGB_PIN{ 8 };  // Pin for  C6
constexpr byte NUMPIXELS{ 1 };

Adafruit_NeoPixel pixels(NUMPIXELS, RGB_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  gpio_hold_dis((gpio_num_t)WAKEUP_PIN);
  pinMode(WAKEUP_PIN, INPUT_PULLUP);
  Serial.begin(115200);
  pixels.begin();
  Serial.println("Started");
}

void loop() {
  pixels.setPixelColor(0, pixels.Color(0, 0, 50));  // Blau
  pixels.show();
  Serial.println("LED Blue");
  delay(1000);
  pixels.clear();
  pixels.show();
  Serial.println("LED Off");
  delay(1000);
  if (digitalRead(WAKEUP_PIN)) {
    goToSleep();
  }
}

void goToSleep() {
  Serial.println("SLEEP: preparing");
  pinMode(WAKEUP_PIN, INPUT_PULLUP);
  gpio_hold_en((gpio_num_t)WAKEUP_PIN);
  esp_sleep_enable_ext1_wakeup_io((1ULL << WAKEUP_PIN), ESP_EXT1_WAKEUP_ANY_LOW);
  Serial.println("SLEEP: entering");
  delay(100);
  esp_deep_sleep_start();
}