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LED fading and superbright LEDs (Read 4331 times)
05/03/07 at 22:46:07

nooodles   Offline
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Hello,

Sorry this is probably a basic question to many of you...

I am would like to use superbright LEDs to try the LED fading tutorial.  I've followed the intructions and uploaded the program, however LED remains unlit. I've tested the LEDs on a 9V battery, and so the LEDs are not broken.

I am using 3.5V (20mA) LED with 100 ohm resistor. The board is powered by a 12V adapter.

Any ideas?

Cheesy

 
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Reply #1 - 05/04/07 at 02:08:50

Alan_Kilian   Offline
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The board will produce 5 Volts on its output, so if your LED has a 3.5 Volt
drop. that's 1.5 Volts left, and 100 Ohms gives you 1.5V/100. Ohms = 1.5 miliAmps which
is probably too small.

Try a smaller resistor like 10 Ohms. That might get you 15 mA.

And point us to a link to a datasheet for the LED in case I'm misunderstanding something.
 
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Reply #2 - 05/04/07 at 06:03:18

nooodles   Offline
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thx. i changed to the 10 ohm resister.

for the wiring, i was following the following example (except i was using analog output):

http://wiring.org.co/learning/tutorials/diagrams.html#010

at first, i attached the black wire to the GND, as shown on the diagram, but nothing happened. then i connected the same wire to the VCC, it started working.

Here is the page for the LED specs:
http://www.superbrightleds.com/specs/g3_specs.htm

THX!!
« Last Edit: 05/04/07 at 20:28:40 by nooodles »  
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