I am using circuits.io with Arduino. my program is to blink the led with 2 seconds delay. The led in the circuit blink according to program but the bulb does not blink. I am very weak in electronics. This is what i starting to learn from the scratch. the problem here is the bulb doesnt blink according to the program. which is meant to blink. i have uploaded the circuit image below.. . thanks in advanced.

Please check the Image here

  • 3
    Your layout makes no sense. Please post a schematic showing all the circuit connections and the power input to the arduino.
    – EM Fields
    Nov 5, 2016 at 11:06
  • 1
    you show no ground connection between arduino and relay, does this represent what you have?
    – Neil_UK
    Nov 5, 2016 at 11:33
  • 2
    this layout... use the schematic editor.
    – Bradman175
    Nov 5, 2016 at 12:04
  • 1
    In the circuit.io layouts that I have seen, they do connect power to the Arduino board. You have yet to do this. (There are other problems, but let's start with the obvious one 1st.)
    – st2000
    Nov 5, 2016 at 14:02
  • 1
    Sorry, I downvoted this, because even after three hours of being pointed to a lack of clear schematic, you haven't tried to improve your diagram. Thus, no answer can be given, and your question holds no value in itself. Nov 5, 2016 at 14:28

1 Answer 1


If you wire up your circuit as shown below, the bulb and the LED should flash together.

enter image description here


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