TomGeorge:
Hi,No, the outputs are driven HIGH to 5V and driven LOW to 0V, so no need for them.
Tom..
Ahhhh... gotcha. So digital outputs on the Arduino (or, more accurately, in the case of a relay's receiving inputs) don't use a voltage cutoff somewhere in the middle like "anything below 2.5V is LOW and anything above or equal to 2.5V is HIGH" as in the case of inputs, then, huh?
So this is interesting. A digital input on the Arduino should have a pull-up resistor to combat random environmental fluctuations. Does that mean that digital inputs, like in the case of those on a relay, have built-in (always on) pull-up resistors as well to combat fluctuations experienced by the relay?