int led_pins[8] = {19, 18, 5, 17, 16, 4, 0, 2};
byte buttonpin = 14;
bool ledstate = false;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(buttonpin, INPUT_PULLUP);
  for (int i = 0; i < 8; i++) {
    pinMode(led_pins[i], OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly);
  int buttonState = digitalRead(buttonpin);
  if (buttonState == LOW) {
    ledstate = !ledstate;
  
  if (ledstate) {
    for (int i = 0; i <= 8; i++) {
      digitalWrite(led_pins[i], HIGH);
    }
    
  }
  else {
    for (int i = 0; i <= 8; i++) {
      digitalWrite(led_pins[i], LOW);
      
    }
  }
  }
  delay(1000);
Serial.println(buttonState);
}