Can I control solid state relay directly from arduino digital pin? I want to switch on/off some AC device using solid state Omron G3MB relay
I know that for magnetic relay there should be transistor and flyback diode, but what about SSR?
Can I connect it directly to arduino digital pin without any transistors and anything else?
In a closer look on special arduino module, we can see some extras. Are they necessary? I want to put solid state relay (not separated module) into my custom PCB, and I'm confused about that extras.
According to the datasheet there are multiple models.
Some already have an input resistor for the led (in the opto-isolator) inside the package, but some don't. For the ones that don't have a resistor inside, you'd need to add one yourself, to limit the current to around 10mA.
Some models also have a snubber circuit inside the package. The need for this depends on what kind of load is connected (inductive vs. resistive (AFAIK)).
I thinks the green thing, in the picture, is a fuse. On the other side of the SSR you can see and indicator led, transistor, and 3 resistor (one to limit current to the SSR, one to limit the current through the indicator led, and on for the base of the transistor.). They probably use a transistor, because the current for the SSR and the indicator led combined, is to high for certain micro controllers.