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Re: distance of pwm cable carrying seria data
Bear in mind that a typical serial cable has a shield, whereas a PWM signal does not. Also, digital communication has a very steep slope with respect to noise - it works great until it doesn't. Try sticking an oscilloscope on the lines to see how it looks.
If you really want to scumbag it, you could try wrapping foil around it and grounding it on either end. People will rightfully laugh at you for this, but sometimes it is just enough to eek you over that working/not working divide.
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