Hello everybody its been a while since I've messed with my Arduino, lots of pressing things in life lately, but I'm getting back into it with an interesting project and I need to know if a certain device exists.
I need a device that can splice into a small motor's (actually an aquarium powerhead) power cord that allows an Arduino to PWM how much line current is going into the motor (powerhead).
The project is an arduino-based wave generator in the reef aquarium I'm building.
Any such beast exist? Also in case I decide to try running more things in my aquarium from an arduino, does the relay shield handle line current?