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Subject: Re: LEDs For Dummies? Pointers needed.
Date: Tue, 10 Dec 2002 00:09:15 -0000
NNTP-Posting-Date: 10 Dec 2002 00:08:23 GMT
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> I am starting a simple project where I would like to control an LED's
> intensity from a computer. I have experience programming and with
> data acquisition cards. However, I am a newbie with LED control.
> Any pointers for good books or web sources for information on this
> topic to get me started?
You might get some ideas from http://discolitez.com/circuits-8led.shtml
Leds don't dim very well on reducing current, compared to filament
bulbs. You need the current to go down in log steps rather than linear
for the eye to appreciate differences. I've had some success using a
string of series diodes to raise the total forward voltage and magnify
current change http://www.cpemma.co.uk/gloss.html
PWM control is normally preferred and may in fact be easier from port
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