Arduino example 1

// Code in the setup section runs once
void setup()
{
    for (int x = 1; x < 5; x++)
    {
        pinMode(x, OUTPUT);
    }
}

// Code in the loop section repeats
void loop()
{
    int pot = analogRead(A0);
    // convert one range to another.
    pot = map(pot, 0, 1023, 100, 2000);
    for (int x = 1; x < 5; x++)
    {
        digitalWrite(x, HIGH);
        delay(pot);
        digitalWrite(x, LOW);
    }
}