led.ino

#include <Arduino.h>

#define PIN_BTN     14
#define PIN_LED     13
#define MAX_TIMER   30

uint8_t counter;

enum state {
    ON,
    OFF
};

state control;

void setup() {
    pinMode(PIN_LED, OUTPUT);
    pinMode(PIN_BTN, INPUT);
    
    counter = 0;
    control = OFF;
}

void loop() {
    if(control == OFF && digitalRead(PIN_BTN) == HIGH) {
        control = ON;
        counter = 0;
        digitalWrite(PIN_LED, HIGH);
    }
    else if(control == ON && counter <= MAX_TIMER) {
        counter++;
    }
    else if(control == ON && count > MAX_TIMER) {
        control = OFF;
        digitalWrite(LED_PIN, LOW);
    }
    
    delay(1000);
}