void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32");

  pinMode(23, OUTPUT);           // Red LED
  pinMode(22, OUTPUT);           // Blue LED
  pinMode(32, INPUT_PULLDOWN);   // Pushbutton
}

void loop() {
static unsigned long prevMs = 0;
unsigned long currMs = millis();

  // Switch red LED (GPIO 22) based on Pushbutton (GPIO 32)
  digitalWrite(23, digitalRead(32));

  // Toggle blue LED (GPIO 23) every second
  if (currMs - prevMs >= 1000) {
    prevMs = currMs;
    digitalWrite(22, !digitalRead(22));
  }

}