[dorkbotpdx-blabber] [GroupOrder] order goes out monday feb 23. guest star: sure electronics

[Eric Garner]

I'm afraid I have some bad news for all of you who were expecting
goodies from Sure. I have canceled the order to Sure Electronics. I've
gone around with them for two days now and I cant get the stuff
shipped any cheaper from them than $85.86 (that's ~$14 a piece). which
would have been a very rude shock to most of you.

I'm sorry to disappoint those of you that were expecting goodies.

the mouser and digikey parts are fine.

-eric


On Tue, Feb 24, 2009 at 9:13 AM, Daniel Johnson <teknotus at gmail.com> wrote:
>> Calculate the resistor value as:
>>  R = (Vdd - Vf) / If
>> where Vdd is the supply voltage (5V for Arudino), "Vf" is the "forward
>> voltage" of the LED (see the spec -- it varies by color; ~2.0V for the
>> LE-DS151), and "If" is the desired "forward current", which will depend on
>> the desired brightness.
>> So, the resistance needed to deliver 10mA to the Red LE-DS151 would be:
>>  R = (5V - 2V) / 10mA = 300ohm
>
> The packages with free resistors don't say what the value of the free
> resistor is.  I had trouble reading the color codes off of the
> pictures too.
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-- 
--Eric
_________________________________________
Eric Garner