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In fact the normal Edison pulse is around 100 microseconds. If you want to improve the pulse speed of your code I would suggest you to implement Fast memory mapped IO. I’m wondering if you have checked this link http://www.i-programmer.info/programming/hardware/8770-exploring-edison-fast-memory-mapped-io.html? The guys at i-Programmer have developed a great guide on how to make use of the Atom CPU to work with the GPIO. This way you should be able to generate shorter pulses.