Looking for a simple circuit to control the light intensity ... Just follow the schematic diagram to complete the construction, and use any standard 9VDC Arduino power source to energize the system.

Turn ON an LED Sketch This is a very simple arduino project where a led is turned on by setting the pin 13 as output, then write it with a high value, in our case that means that pin 13 will deliver 5 ...

Next on the list is Proteus, a simple Arduino simulator that is quite known ... Furthermore, it offers Tinkercard Circuits, an electronic simulator for simulating electronic circuits.