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Thread: LED Challenged
www.piclist.com/techref/displays.htm?key=led
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face BY : Bob Blick email (remove spam text)



>However, I believe you've got a mistaken impression on the LED voltage
>drop. They usually start about 1.7-2.0 V. In this case

The original poster probably had the drop right.
Backlit LCD displays I've used have a series+parallel string and you have
the equivalent of 2 series LEDs.

Back to the original topic, is it neccessary to have infinite levels? Why
not just 3 levels controlled by two pins, each driving a transistor and
resistor.

If you decide to so software PWM, make it very regular, or you'll notice
pulsing as the PIC does different tasks(especially if you do a timer based
interrupt and sometimes shut off interrupts!).

-Bob

- Every day, computers are making people easier to use -

<3.0.32.20000528202344.0077a32c@saber.net>

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