const byte PinLed [] = { 13, 12, 11, 10 };
enum { West, South, North, East };
enum { WE = A0, NS = A3 };

enum { Off = HIGH, On = LOW };

char s [90];

// -----------------------------------------------------------------------------
void loop()
{
    int we = analogRead (WE);
    int ns = analogRead (NS);

    digitalWrite (PinLed [East], 520 < we ? On : Off );
    digitalWrite (PinLed [West], 500 > we ? On : Off );

    digitalWrite (PinLed [North], 520 < ns ? On : Off );
    digitalWrite (PinLed [South], 500 > ns ? On : Off );

    sprintf (s, " %d %d  %d %d", we, ns, 550 < we, 450 > we);
    Serial.println (s);

    delay (200);
}

// -----------------------------------------------------------------------------
void setup()
{
    Serial.begin (9600);
    Serial.println (North);

    for (unsigned n = 0; n < sizeof(PinLed); n++)  {
        pinMode (PinLed [n], OUTPUT);
        digitalWrite (PinLed [n], On);
        delay (250);
        digitalWrite (PinLed [n], Off);
    }
}