Hej Harold Hallikainen. Tack f=F6r ditt meddelande 15:09 2002-09-06 enligt=
 nedan:
>Another trick on 2 pin bi-color LEDs is to put a couple resistors in series=
 (I use about 240 ohms) between +5V and ground. Put the LED between the=
 junction of the resistors and the PIC pin. Tristate the pin to turn the LED=
 off (note that PIC power dissipation will go up a bit since the pin is held=
 at half Vcc by LED leakage current).

The bigger power waste is that current also flows in the resistor that is=
 parallel to th elit diode.  And when both are off, current flows in both=
 resistors.

One method is to replace both resistors with zeners, and add one current=
 limiting resistor in series with the led.  (if we don=B4t dare to rely on=
 totla series resistnace of PIC+LED+zener, which i don=B4t).

/Morgan

> To make the LED glow one color, set the pin low. The other color, set the=
 pin high. This trick can save you one PIC pin.
>
>Harold
>
>
>
>
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http://www.piclist.com hint: The PICList is archived three different
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