#define LED_PIN 21
#define BUTTON_PIN 33

byte buttonState;
byte LEDState;

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT);
  LEDState = LOW;
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  buttonState = digitalRead(BUTTON_PIN);
  Serial.print("buttonState:");
  Serial.println(buttonState);
  delay(10);
}