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  • What are you trying to do with the relay? What drives you to think you want to connect the NO pin to pin 13 of the Arduino? Commented Sep 10, 2017 at 11:21
  • @Majenko Turn on a LED - instructions in here link Commented Sep 10, 2017 at 11:28
  • Ohkay.... that's just ... bizarre. Commented Sep 10, 2017 at 11:28
  • Ah, I see why he thought it would be good to wire it that way - he has no clue about the Arduino's schematics or design and thought there was a resistor on that pin so you wouldn't have to use one. BZZZT. Incorrect. Disconnect the relay from pin 13. You have no reason to want to use that pin. You only need one pin for the relay. Commented Sep 10, 2017 at 11:38
  • @Majenko So i connect one pin straight to GND - other one to pin 8. Right ? and can i use pin 1 or 0 ? Commented Sep 10, 2017 at 11:41