Hello There are several ways of controlling relays from atrduino: -Using transistor, diode and resistor (and having a common ground) -Using Optoisolator (I have found 4 channels IC, may be there are 8 channels) -Using relay driver, like ULN2803A -Using SSR and connecting it directly to arduino'…

What is the best way for controlling array of 8-16 relays?

holmes4 October 6, 2012, 3:24pm 2

What type of relay. How much power to control the relay?

Mark