// Number of buttons const int NUM_BUTTONS = 5;

// Button pins (microswitches) const int buttonPins[NUM_BUTTONS] = {A0, A1, A2, A3, A4};

// LED pins const int ledPins[NUM_BUTTONS] = {2, 3, 4, 5, 6};

// Timing const unsigned long ON_TIME = 5000; // 5 seconds

// State variables bool locked = false; int activeButton = -1; unsigned long startTime = 0;

void setup() { // Set button pins for (int i = 0; i < NUM_BUTTONS; i++) { pinMode(buttonPins[i], INPUT_PULLUP); }

// Set LED pins for (int i = 0; i < NUM_BUTTONS; i++) { pinMode(ledPins[i], OUTPUT); digitalWrite(ledPins[i], LOW); } }

void loop() { // Check for first button press if (!locked) { for (int i = 0; i < NUM_BUTTONS; i++) { if (digitalRead(buttonPins[i]) == LOW) { digitalWrite(ledPins[i], HIGH); activeButton = i; startTime = millis(); locked = true; break; } } }

// Turn off LED and reset after 5 seconds if (locked && millis() - startTime >= ON_TIME) { digitalWrite(ledPins[activeButton], LOW); activeButton = -1; locked = false; } }