#include "mbed.h"

PwmOut alarm(p21);
DigitalOut led(LED1);
AnalogIn door(p20);
Timer timer1;
InterruptIn switchEvent(p8);
Serial pc(USBTX, USBRX);

int button=0;

void switchPressed()
{
    wait(0.05);
    if(switchEvent==0)
    {
        button = 1;
    }
}

int main()
{
        alarm.period(0.010);
        alarm = 0;
        led = 1;
        switchEvent.fall(switchPressed);

    while(1)
    {
        led = 1;

        if(door < 0.15 ) //door open
        {
            led = 0;
            timer1.start();

            while(1)
            {
                wait(0.1);

                if(timer1.read() >= 5) // buzzer 10sec
                {
                    alarm = 0.5;
                }

                if((door > 0.15 && timer1.read() < 5) || button == 1) //door close
                {
                    button = 0;
                    alarm = 0;
                    break;
                }

            }
        }
    }
}