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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrAzzy
How bout 0.4 and 1.4 or something - give yourself some margin.
I don't have equipment to monitor digitalPulse() output - this thread is making me suspicious of it, as it's just so simple in theory. I don't know how you could do that with a scope, since it's a transient signal. Maybe with one of those newfangled digital scopes....
You've tried the LED both ways around (flipping it will invert the on time and gaps, which would also look like a signal to the receiver)