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I can think of a couple of ways to change the brightness of an LED during a scan. If you only wanted maybe three levels: Full on, Mid, and Off, then you may be able to scan at twice the normal frequency. For Full brightness you'd turn the LED on for both scan cycles. For half brightness only for one cycle, and for off, none of the scan cycles. Another method might be to use the normal scan rate but use multiple output pins for each LED. Each pin would have a different value of resistor going ot the LED such that it makes a simple D/A converter. Using two lins for each LED could give you OFF 1/4 1/2 Full brightness levels. Best Wishes.
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Posted:Nov 8, 2010
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