Today I bought a solid state relay, the datasheet for which can be found here. My goal is to use it to switch 120VAC, controlled by an Arduino Uno board (with Atmega 328 microcontroller). I am very rusty since my days in EE classes, and have not worked with solid state relays at all. In the datasheet, under Electro-optical Characteristics > Input, it shows the typical forward voltage is 1.2V under the condition that the forward current is 20mA. This leads me to believe that it is a current-controlled device (similar to a diode). Is this indeed the case? Would it be a problem to just apply ~1.2V? Essentially I have to drive it with a PWM signal. Any advice on some simple circuitry that I could use to accomplish this? I have essentially no requirements on switching time, anything under 1s is acceptable to me.