Arduino + Relay Explanation

Forum 2005-2010 (read only) General Frequently-Asked Questions
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The diagram looks good, and the discussion is fine so far. Just a couple of extra clarifications:

  1. I'm not sure that ALL solid state relays have a built-in resistor on the LED side. Check the datasheet to be sure.
  2. you can use a breadboard on the "control" side of a high-current relay circuit, just not on the high-current "controlled" side.
  3. MANY solid state relays will control AC only. Since that's what you want to do, you shouldn't have a problem, but you can't necessarily stick a 20A SSR into a circuit where you want to control 20A of DC current.

Means i can use Breadboard at the Arduino side?

BTW someone advised me to measure the current for SSR? How to do that? And BTW isnt it clear from the SSR specs how much current it draws?