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() {
  // Switch blue based on pushbutton
  digitalWrite(23, digitalRead(22));
 
  // Toggle red LED every second
  digitalWrite(22, !digitalRead(22));
  delay(1000);   // 1-second freeze
}