Question about PowerSwitch Tail II

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1

I want to make sure that i'm about to use the PowerSwitch Tail II properly with the arduino Uno.

I have this powerswitch tail Powerswitch tail 2 : ID 268 : $25.95 : Adafruit Industries, Unique & fun DIY electronics and kits

It has three pins: +in, -in and ground. I plan to hook up +in to a digital pin on the arduino and -in to the arduino ground. And leave ground empty?

On adafruit it states that this version of the powerswitch tail II is opti-isolated so hooking it directly to the arduino uno without a transistor or any kind of protection should be safe and provide enough power to trigger the relay in the powerswitch, right?

Thanks!

2

According to the info on the adafruit page you linked to, that is correct. Looks like it is a standard SSR in a box with a power plug and socket attached. I'm guessing that the ground connection is just a convenience in case you want to connect Arduino ground to mains ground, since I can't see any other reason for it.

[EDIT: just looked at the data sheet and it appears to use a mechanical relay driven from an opto triac, rather than an SSR.]