I have the same problem with P8 pins and am using the cloud 9 interface ? 
did you find a solution?

On Friday, March 28, 2014 at 11:14:11 PM UTC+2, jaden Gani wrote:
>
> I will try that. I am using cloud9 when I use the sleep command. The funny 
> thing is that some of the pins are outputting voltage right after the board 
> has been powered on and they won't respond to anything. I'll try updating a 
> few things. See if that works. Thanks!
>
> On Thursday, March 27, 2014 8:46:50 AM UTC-4, mickeyf wrote:
>>
>> What Gerald is saying is that in general you should not expect to drive 
>> an LED directly - you will want to drive a transistor which can then supply 
>> perhaps 20 ma or more to your LED and at the correct voltage. Perhaps you 
>> are already doing this, but you didn't say.
>>
>> I don't know anything about the Cloud 9 interface, but if is blinking by 
>> just using the shell (" echo 1 > pin whatever....) with "sleep", sleep may 
>> not recognize any increment of less than integral seconds. I'd look into 
>> that. Maybe see if it works for longer intervals like 3 or 5 seconds...
>>
>> Speaking strictly for me, when something doesn't work, 99.9% of the time 
>> it's something I did wrong, not the hardware etc.
>>
>

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