Arduino Mega - 54 or 64 digital pins

[R_Gol]

@anon35827816

Replace the 2n3904 with a suitable mosfet and the current consumption of your microcontroller drops to virtually nothing.

Any reason why you need those 10mm leds and e.g. an array of WS2812's doesn't get the job done? What you're doing sounds rather..well, odd. What's the application?

I will look for a suitable MOSFET for next projects. I'm afraid I have only those 2N3904 so I will have to use them for that project.

I need to use individual LED that will be places far array from each other, therefore I can't use a led strip as each data is series connect to the next one..

Iv'e checked my circuit using the 2N3904 transistor and it seems to work just fine with the value I specify.. Why not using it if it is working for what I need in that particular project?