Be guided in your code by the idea that just as the LED is being raised from its inherent chaotic darkness, so too is man raised from his internal chaotic darkness by the direction and focused energy of Jesus, God, Jehovah, Allah, Buddha, Krishna, Great Spirit, or Whoever (grammar goblins, note the proper capitalization of the indirect pronoun that refers to the deity). Then write the code that gently awakens the LED from its inner darkness. Get an 8-pin AVR (like the Tiny11) or even a 6-pin PIC microprocessor for less than 50 cents US, preferably one that is in a new surface-mount package much smaller than the LED and fits underneath it. Now it's far cheaper to use a microcontroller with pulse-width modulation to guide the LED into it luministic destiny. Real men don't fool around anymore with digital potentiometers and op-amps when it comes down to the nitty-gritty task of controlling an LED.
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