[Noisebridge-discuss] LED Calculations help

Phil Spitler phil at bonfirelabs.com
Mon May 21 13:15:20 PDT 2012


Great, thanks.

This is exactly what I need.

Thanks.

Phil

Phil Spitler |   Associate Creative Director  |  Bonfire  Labs  |  t : 415.394.8200  |  c : 415.571.3139  |  Bonfirelabs.com

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On May 21, 2012, at 5:22 AM, Nicholas Granado wrote:

> hi phil,
> 
> that link states that the forward voltage is rated @ 3.4 volts with a 20ma draw; however they can be powered at 3.0 volts with approx. 10ma draw.
> 
> nick
> 
> 
> 
> On Sun, May 20, 2012 at 10:16 PM, Phil Spitler <phil at bonfirelabs.com> wrote:
> Hi,
> For simple LED projects, I usually use an online LED calculator to get the values for the needed resistors.
> 
> I have just ordered some LEDs online but the specifications don't list the forward voltage, just the current draw.
> 
> http://www.adafruit.com/products/679
> 
> How would I figure out how to power the LEDs and what resistors to use?
> 
> I am thinking of using 10 LEDs and having them all powered, all the time.
> 
> I would love to know how to calculate my needs.
> 
> Any ideas?
> 
> Cheers.
> 
> Phil
> 
> 
> 
> Phil Spitler |   Associate Creative Director  |  Bonfire Labs |  t : 415.394.8200  |  c : 415.571.3139  |  Bonfirelabs.com
> 
> 
> 
> 
> 
> 
> 
> 
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> 

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