// https://wokwi.com/projects/373213655222061057
// https://forum.arduino.cc/t/flipflop-type-of-code/1156858

// if a 'lock' signal is received:
//   mirror fold pin: go HIGH for 50ms, then go LOW.
//   hazard lights and horn pin: go high for 200ms, go low

// if 'unlock' signal is received:
//   mirror fold pin: go HIGH for 50ms, then go LOW.
//   hazard lights and horn pin: go high for 200ms, go low for 200ms,
//      go high for 200ms, go low.

const byte PinLock      = 2;
const byte PinUnlock    = 3;

const byte PinMirror    = 11;
const byte PinHorn      = 5;
const byte PinHazzard   = 8;

enum { Off = LOW, On = HIGH };
bool locked;

// -----------------------------------------------------------------------------
void
loop (void)
{
    if (! locked && LOW == digitalRead (PinLock)) {   // lock
        Serial.println ("lock");
        locked = true;

        digitalWrite (PinMirror,  On);
        digitalWrite (PinHorn,    On);
        digitalWrite (PinHazzard, On);

        delay (50);
        digitalWrite (PinMirror,  Off);

        delay (150);
        digitalWrite (PinHorn,    Off);
        digitalWrite (PinHazzard, Off);
    }

    if (locked && LOW == digitalRead (PinUnlock)) {   // un-lock
        Serial.println ("un-lock");
        locked = false;

        digitalWrite (PinMirror,  On);
        digitalWrite (PinHorn,    On);
        digitalWrite (PinHazzard, On);

        delay (50);
        digitalWrite (PinMirror,  Off);

        delay (150);
        digitalWrite (PinHorn,    Off);
        digitalWrite (PinHazzard, Off);

        delay (200);
        digitalWrite (PinHorn,    On);
        digitalWrite (PinHazzard, On);

        delay (200);
        digitalWrite (PinHorn,    Off);
        digitalWrite (PinHazzard, Off);
    }
}


void
setup (void)
{
    Serial.begin (9600);

    pinMode (PinLock,   INPUT_PULLUP);
    pinMode (PinUnlock, INPUT_PULLUP);

    pinMode (PinHorn,    OUTPUT);
    pinMode (PinHazzard, OUTPUT);
    pinMode (PinMirror,  OUTPUT);

    digitalWrite (PinHorn,    LOW);
    digitalWrite (PinHazzard, LOW);
    digitalWrite (PinMirror,  LOW);
}

/*

// if a 'lock' signal is received:
//   mirror fold pin: go HIGH for 50ms, then go LOW.
//   hazard lights and horn pin: go high for 200ms, go low

// if 'unlock' signal is received:
//   mirror fold pin: go HIGH for 50ms, then go LOW.
//   hazard lights and horn pin: go high for 200ms, go low for 200ms,
//      go high for 200ms, go low.

const byte PinLock      = 2;
const byte PinUnlock    = 3;

const byte PinMirror    = 11;
const byte PinHorn      = 5;
const byte PinHazzard   = 8;

enum { Off = LOW, On = HIGH };

bool locked;

# define PRESST LOW

// -----------------------------------------------------------------------------
void
loop (void)
{
    if (!locked && digitalRead(PinLock) == PRESST) {   // lock
        Serial.println ("lock");
        locked = true;

        digitalWrite (PinMirror,  On);
        tone(PinHorn, 520);
        digitalWrite (PinHazzard, On);
        delay (50);

        digitalWrite (PinMirror,  Off);
        delay (150);

        noTone(PinHorn);
        digitalWrite (PinHazzard, Off);
    }

    if (locked && digitalRead(PinUnlock) == PRESST) {   // un-lock
        Serial.println ("un-lock");
        locked = false;

        digitalWrite (PinMirror,  On);
        tone(PinHorn, 400);
        digitalWrite (PinHazzard, On);
        delay (50);

        digitalWrite (PinMirror,  Off);
        delay (150);

        noTone(PinHorn);
        digitalWrite (PinHazzard, Off);
        delay (200);

        tone(PinHorn, 400);
        digitalWrite (PinHazzard, On);
        delay (200);

        noTone(PinHorn);
        digitalWrite (PinHazzard, Off);
    }
}


void
setup (void)
{
    Serial.begin (9600);

    pinMode (PinLock,   INPUT_PULLUP);
    pinMode (PinUnlock, INPUT_PULLUP);

    pinMode (PinHorn,    OUTPUT);
    pinMode (PinHazzard, OUTPUT);
    pinMode (PinMirror,  OUTPUT);

    digitalWrite (PinHorn,    LOW);
    digitalWrite (PinHazzard, LOW);
    digitalWrite (PinMirror,  LOW);
}
*/