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Re: [AVR-Chat] Bi-Colour LED coontrol with one pin?

2006-03-04 by Russell Shaw

Roy wrote:
> See attached word doc have added individual LED resistors to adjust
> current.
> 
> This is to meet the original requirement of 2 LED's on one port pin.
...

Even tho the simulation works, it's not a good circuit for production
if the LEDs are likely to get changed from the ones designed for. Some
Agilent LED voltage variances for 20mA:

AlGaAs Red:           1.8-2.3V
Hi efficiency Red:    2.0-2.5V
Yellow:               2.2-2.5V
Hi performance Green: 2.1-2.5V

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