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[Reply #15 on:]

But a few days ago I connected the LEDs without a resistor and without a transistor(I connected the set LEDs), and everything worked fine, so do you still advice me to use a transistor and a resistor.

[Reply #16 on:]

I connected the LEDs without a resistor and without a transistor(I connected the set LEDs), and everything worked fine,

What you should say is "there was no immediate, visible damage to my AV microcontroller".

[Reply #17 on:]

Ok then I will use resistors, but I cannot use any transistors because I do not have any right now

[Reply #18 on:]

Ok, wire up your sets of resistors in parallel then with a resistor each, being sure the total current draw stays under 20ma.

[Reply #19 on:]

This is what I did, I used four transistors, for the 4 sets of LEDs and I added a resistor from the middle pin of each trasistor to the arduino.
And this works absolutely fine, no problems, and the current is about 18 on my ammeter.

[Reply #20 on:]

Sounds like you're on the path to success!