If you mean that you want to light several LEDs using one I/O pin, then you need some kind of switching transistor or driver to handle the amount of current and voltage involved. There's a good Nuts and Volts Column on driving external loads (#6). Go to the main Parallax webpage and click on the Resources tab. You'll see "Nuts and Volts Columns" on the list that appears. If you click on that, you'll get an index to all the Columns. The discussion in that Column is mostly about motors, solenoids, and relays, but the same principles apply to multiple LEDs.
Mr.HOW
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If you mean that you want to light several LEDs using one I/O pin, then you need some kind of switching transistor or driver to handle the amount of current and voltage involved. There's a good Nuts and Volts Column on driving external loads (#6). Go to the main Parallax webpage and click on the Resources tab. You'll see "Nuts and Volts Columns" on the list that appears. If you click on that, you'll get an index to all the Columns. The discussion in that Column is mostly about motors, solenoids, and relays, but the same principles apply to multiple LEDs.