/* Smolder Effect

• Eric Reuter
• This code generates a smoldering fire lighting effect to be used with orange LEDs. A random brightness
• level is selected, along with a random interval of time to get there from the current level.
• Once the level is reached, reset() is called, and a new level/interval are generated.
• Constraints for brightness (0 to 255) and interval length (in ms) are defined at the top.
• Code is non-blocking, using millis() for timing. Just call it in the loop. */