How many servos can be powered off a single PWM terminal on the Sidecar?
 

I found this answer from 2009: http://forums.usfirst.org/showthread.php?t=11822

I'm wondering if this is still the case.

Re: How many servos can be powered off a single PWM terminal on the Sidecar?
 

As far as I'm aware. One device per port tends to be the standard.

Re: How many servos can be powered off a single PWM terminal on the Sidecar?
 

I couldn't find a rule that explicitly ruled in one direction or the other.

R54 was the closest I could find:

Re: How many servos can be powered off a single PWM terminal on the Sidecar?
 

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)?

Re: How many servos can be powered off a single PWM terminal on the Sidecar?
 

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.