2 Potentiometers controlling a single LED

[johnwasser]

@anon26912280

I know to make this work I need to use millis() so the code can loop freely without interfering with the button, but I'm having great difficulty controlling the single LED's on and off time with 2 Pots using millis().

Start with File->Examples->02.Digital->BlinkWithoutDelay

When the LED switches from ON to OFF, take that opportunity to change the 'interval':

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
      interval = map(analogRead(pot1), 0, 1023, 50, 500);
    } else {
      ledState = LOW;
      interval = map(analogRead(pot2), 0, 1023, 50, 500);
    }

Of course, if you do that without changing anything else you will get an error: "assignment of read-only variable 'interval'". That means "Take the 'const' keyword off of the declaration of 'interval' if you want to be able to change it!"