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sproutworks
LED projects 1451 views
January 30th, 2005 4:54 AM PST
I bought a pack of 10 LEDs from Fry's Electronics the other day. I intend to build battery powered devices with them. I used to play with these as a kid, and I want to build more complex devices now.

According to this site http://www.arunet.co.uk/tkboyd/ele1pp2.htm

, I need to add a resistor to my circuit (around 400 to 650 ohms) to make the LED work. When I used to play with LEDs I didn't need any resistors to make them work, so I figure the modern LEDs operate differently.

The aforementioned site explains how to connect LEDs to a computer's parralel port. That is of great interest to me because I can write software to control the LEDs.