cpp
void blinkLED() {
    digitalWrite(23, !digitalRead(23));  // Toggle the red LED
    Serial.println("[%ld]: %s\n", millis(), __func__);
}

void setup() {
    Serial.begin(115200);
    Serial.println("Lab 5.1");
    pinMode(23, OUTPUT); // Red LED
    pinMode(22, OUTPUT); // Blue LED
    pinMode(32, INPUT_PULLUP); // Pushbutton (using internal pull-up)
}

void loop() {
    delay(5000); // 5-second freeze
    blinkLED();
}

// Switch blue LED based on pushbutton
digitalWrite(22, digitalRead(32) == LOW ? HIGH : LOW);  // If button pressed (LOW), turn ON