Quote:
Originally Posted by Andy A.
Eric- is it correct to assume that the DC power pins on the PWM ports are all supplied by the same source? In other words, is there any performance difference between using a Y cable or separate ports for each servo (possible signal issues aside)?
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Your assumption is correct. All of the 6V power pins are directly tied together with nothing separating them. Power wise, a Y-cable really shouldn't have a measurable* effect.
I haven't tested signal effects, but most servos are not opto-isolated and therefore don't consume measurable signal current.
* Assuming that extra cable length is 50mOhms and 800mA draw at stall, you losing 40mV above what you would with separate power pins, which amounts to less than a 1% performance difference - and this is an extremely conservative estimate. I would imagine that it would be swamped by measurement accuracy and part-to-part variability.