I know there are other posts like this but none have been correctly answered. I have this circuit, and I would like to control it with an Arduino without a relay. Is this possible?
closed as unclear what you're asking by JRobert, Mattia, dhimaspw, jfpoilpret, Nick Gammon♦ Jan 29 '17 at 6:20
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That is just an LED... you can simply connect the LED anode to an Arduino IO pin and the cathode through a 330Ohms resistor to ground.
Then just write the Arduino sketch to toggle the IO on and off.
Check the blink example sketch.